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| 1 | Strength reduction and step-loading finite element approaches in geotechnical engineering显示文摘The finite element limit analysis method has the advantages of both numerical and traditional limit equilibrium techniques and it is particularly useful to geotechnical engineering.This method has been developed in China,following well-accepted international procedures,to enhance understanding of stability issues in a number of geotechnical settings.Great advancements have been made in basic theory,the improvement of computational precision,and the broadening of practical applications.This paper presents the results of research on(1) the efficient design of embedded anti-slide piles,(2) the stability analysis of reservoir slopes with strength reduction theory,and(3) the determination of the ultimate bearing capacity of foundations using step-loading FEM(overloading).These three applications are evidence of the design improvements and benefits made possible in geotechnical engineering by finite element modeling. | Yingren Zheng Xiaosong Tang Shangyi Zhao Chujian Deng Wenjie Lei | 2009 | Journal of Rock Mechanics and Geotechnical Engineering2009，1，1： | 23 |
| 2 | Study on the FEM design of reinforced earth retaining wall with geogrid显示文摘At present,limit equilibrium method is often adopted in the design of reinforced earth retaining wall. Geotechnical engineers home and abroad have done a lot of work to improve the traditional calculation methods in recent years,while there are lots of defects. This paper first identifies the location of failure surface and safety factor through the finite element program of PLAXIS and then analyses the influencing factors of the stability of reinforced earth retaining wall with geogrid. The authors adopt strength reduction FEM (finite element method)in the design and stability analysis of reinforced earth retaining wall and have achieved some satisfying results. Without any assumptions,the new design method can automatically judge the failure mode of reinforced earth retaining wall,consider the influence of axial tensile stiffness of the reinforcement stripe on the stability of retaining wall,identify reasonable distance and length of the reinforcement stripe,and choose suitable parameters of reinforcement stripe,including strength,stiffness and pseudo-friction coefficient which makes the design optimal. It is proved through the calculation examples that this method is more reasonable,reliable and economical in the design of reinforced earth retaining wall. | Song Yakun Zheng Yingren Tang Xiaosong Zhang Yufang | 2010 | Engineering Sciences2010，8，3： | 4 |
| 3 | Generalized Plastic Mechanics and Its Application显示文摘The development of geotechnical plasticity is reviewed and some problems of applying the classical plastic mechanics (CPM) to geomaterials are analyzed, and then CPM’s three hypotheses not fitted the deformation mechanism of geomaterials are pointed out. By giving up the three hypotheses, a generalized plastic potential theory can be obtained from solid mechanics directly, and then the traditional plastic mechanics can be changed to a more generalized plastic mechanics, namely generalized plastic mechanics (GPM). The GPM adopts the component theory as theoretical base, so it can reflect the influence of transition of stress path. The unreasonable phenomena such as excessive dilatancy caused by adopting the normality-flow law can be avoided, and the error caused by the arbitrary assumption of plastic potential surfaces cannot be produced. The yield surface theory, hardening laws and stress-strain relations of GPM are given, and a GPM including the rotation of principal stress axes is also established. It is pointed out that the yield condition is a state parameter as well as a test parameter, and it can only be given by test. After the practical application, it is shown that the GPM cannot only be applied to the modeling theory of geomaterials but also to other fields of geomechanics such as limit analysis. | Zheng Yingren Kong Liang | 2006 | 工程科学(英文版)2006，4，1： | 4 |
| 4 | New method of designing anti-slide piles——the strength reduction FEM显示文摘At present,the thrust of an anti-slide pile can be worked out with some calculation methods. However,the resistance in front of the pile,the distributions of resistance and thrust,and appropriate pile length cannot be easily obtained. In this paper,the authors applied the strength-reduction finite element method (FEM) to several design cases of anti-slide piles. Using this method,it is possible to take the pile-soil interactions into consideration,obtain reasonable resistance in front of pile and the distributions of thrust and resistance,and reasonable lengths of anti-slide piles. In particular,the thrust and resistance imposed on embedded anti-slide piles can be calculated and composite anti-slide pile structures such as anchored piles and braced piles can be optimized. It is proved through the calculation examples that this method is more reliable and economical in the design of anti-slide pile. | Zheng Yingren Zhao Shanyi Lei Wenjie Tang Xiaosong | 2010 | Engineering Sciences2010，8，3： | 3 |
| 5 | The study of slip line field and upper bound method based on associated flow and non-associated flow rules显示文摘At present,associated flow rule of traditional plastic theory is adopted in the slip line field theory and upper bound method of geotechnical materials. So the stress characteristic line conforms to the velocity line. It is proved that geotechnical materials do not abide by the associated flow rule. It is impossible for the stress characteristic line to conform to the velocity line. Generalized plastic mechanics theoretically proved that plastic potential surface intersects the Mohr-Coulomb yield surface with an angle,so that the velocity line must be studied by non-associated flow rule. According to limit analysis theory,the theory of slip line field is put forward in this paper,and then the ultimate bearing capacity of strip footing is obtained based on the associated flow rule and the non-associated flow rule individually. These two results are identical since the ultimate bearing capacity is independent of flow rule. On the contrary,the velocity fields of associated and non-associated flow rules are different which shows the velocity field based on the associated flow rule is incorrect. | Zheng Yingren Deng Chujian Wang Jinglin | 2010 | Engineering Sciences2010，8，3： | 2 |
| 6 | Application of dynamic analysis of strength reduction in the slope engineering under earthquake显示文摘At present,the methods of analyzing the stability of slope under earthquake are not accurate and reasonable because of some limitations. Based on the real dynamic tensile-shear failure mechanism of slope,the paper proposes dynamic analysis of strength reduction FEM (finite element method) and takes the reduction of shear strength parameters and tensile strength parameters into consideration. And it comprehensively takes the transfixion of the failure surface,the non-convergence of calculation and mutation of displacement as the criterion of dynamic instability and failure of the slope. The strength reduction factor under limit state is regarded as the dynamic safety factor of the slope under earthquake effect and its advantages are introduced. Finally,the method is applied in the seismic design of anchors supporting and anti-slide pile supporting of the slope. Calculation examples show that the application of dynamic analysis of strength reduction is feasible in the seismic design of slope engineering,which can consider dynamic interaction of supporting structure and rock-soil mass. Owing to its preciseness and great advantages,it is a new method in the seismic design of slope supporting. | Ye Hailin Zheng yingren Huang Runqiu Li Anhong Du Xiuli | 2010 | Engineering Sciences2010，8，3： | 2 |
| 7 | Research on the stability analysis and design of soil tunnel surrounding rock显示文摘The paper first analyzes the failure mechanism and mode of tunnel according to model experiments and mechanical calculation and then discusses the deficiency of taking the limit value of displacement around the tunnel and the size of the plastic zone of surrounding rock as the criterion of stability. So the writers put forward the idea that the safety factor of surrounding rock calculated through strength reduction FEM(finit element method) should be regarded as the criterion of stability,which has strict mechanical basis and unified standard and would not be influenced by other factors. The paper also studies the safety factors of tunnel surrounding rock (safety factors of shear and tension failure) and lining and some methods of designing and calculating tunnels. At last,the writers take the loess tunnel for instance and show the design and calculation results of two-lane railway tunnel. | Zheng Yingren Qiu Chenyu Xiao Qiang | 2010 | Engineering Sciences2010，8，3： | 2 |
| 8 | Analytic solution of phreatic surface in the slope of reservoir bank显示文摘In most cases, the slope stability of reservoir bank is analyzed on the premise that the location of phreatic surface is obtained. But many designers generalize a line as the phreatic surface through their experience to analyze the stability, which is unsafe in the project. To find a solution of the phreatic surface which is convenient to put into use and in accordance with the practice, the article, based on Boussinesq equation, infers analytic solutions suitable to the water level at different ratios and achieves an analytic solution equation through fitting curves. The correctness of the equation is also proved by the experiments of sand and sand-clay models and the inaccuracy of empirical generalization is analyzed quantitatively. The calculation results show that the inaccuracy through the method of experiential generalizing is so large that the designers should be awake to it. | Tang Xiaosong Zheng Yingren Shi Weimin | 2008 | Engineering Sciences2008，6，3： | 2 |
| 9 | Nucleoside analogues improve the short-term and long-term prognosis of patients with hepatitis B virus-related acute-on-chronic liver failure显示文摘 | Tianyan Chen Yingli He Xiaojing Liu Zhi Yan Ke Wang Hongli Liu Shuling Zhang Yingren Zhao | 2012 | Clinical and Experimental Medicine2012，，3： | 2 |
| 10 | Strain space formulation of the elasto-plastic theory and its finite element implementation显示文摘 | Zheng Yingren Chn Jian Xu Zhenhung | 1986 | Computer and Geotechnics1986，2，： | 1 |
| 11 | Proapoptotic IL-18 in patients with chronic hepatitis C treated with pegylated interferon-alpha 显示文摘 | YingLi H Shumei L Qian Y Tianyan C Yingren Z Wei C | 2009 | Clin Exp Med2009，9，2： | 1 |
| 12 | Tenofovir disoproxil fumarate therapy in patients with chronic hepatitis B and advanced fibrosis or compensated cirrhosis显示文摘Background and aims:Tenofovir disoproxil fumarate(TDF)is the first-line therapy for chronic hepatitis B.This interim analysis presents the efficacy and safety data for TDF at Week 144 in patients with chronic hepatitis B and advanced fibrosis or compensated cirrhosis from China.Methods:Patients were assessed for incidence of newly diagnosed hepatocellular carcinoma(HCC)and disease progression,liver stiffness measurement(LSM),virological suppression(serum hepatitis B virus DNA<20 IU/mL),alanine aminotransferase normalization,hepatitis B e antigen(HBeAg)loss and seroconversion,histological liver fibrosis score,and safety at Week 144.Results:Overall,197 patients were enrolled.At Week 144,the incidence of newly diagnosed HCC was observed in 2.1%patients,and the incidence of disease progression was observed in 3.6%patients.The mean(standard deviation)change in LSM from baseline was5.1(5.85)kPa.Serum hepatitis B virus DNA<20 IU/mL was observed in 94.1%patients,alanine aminotransferase normalization in 33.5%patients,HBeAg loss in 35.6%patients,and HBeAg seroconversion in 14.4%patients.Among patients with stage F3 or F4 fibrosis at baseline by LSM,38.3%patients regressed to stage F0/1,and 22.0%of patients regressed to stage F2 at Week 144.Overall,67.7%patients experienced≥1 adverse events,13.8%patients experienced TDF-related adverse events,and 16.4%patients experienced serious(none were TDF-related).Conclusions:At Week 144 of TDF treatment,low incidence of HCC and disease progression were reported.Virological suppression was observed in 94.1%patients,which was associated with fibrosis regression.No new safety events were identified. | Huiying Rao Jia Shang Qing Xie Jianqi Lian Pujun Gao Junping Shi Xinyue Chen Jiefei Wang Min Xu Liaoyun Zhang Yingren Zhao QingMao Maorong Wang Wei Zhao Zong Zhang Jidong Jia Hong Tang Jiming Zhang Xin Zheng Chang Liu Lai Wei | 2022 | iLIVER2022，1，3： | 1 |
| 13 | Strength reduction and step-loading finite element approaches in geoteehnical engineering 显示文摘 | Zheng Yingren | 2009 | Journal of Rock Me- chanics and Geotechnieal Engineering2009，，1： | 1 |
| 14 | An elastic mechanics model and computation method for geotechnical material显示文摘Internal friction characteristic is one of the basic properties of geotechnical materials and it exists in mechanical elements all the time. However,until now internal friction is only considered in limit analysis and plastic mechanics but not included in elastic theory for rocks and soils. We consider that internal friction exists in both elastic state and plastic state of geotechnical materials,so the mechanical unit of friction material is constituted. Based on study results of soil tests,the paper also proposes that cohesion takes effect first and internal friction works gradually with the increment of deformation. By assuming that the friction coefficient is proportional to the strain,the internal friction is computed. At last,by imitating the linear elastic mechanics,the nonlinear elastic mechanics model of friction material is established,where the shear modulus G is not a constant. The new model and the traditional elastic model are used simultaneously to analyze an elastic foundation. The results indicate that the displacements computed by the new model are less than those from the traditional method,which agrees with the fact and shows that the mechanical units of friction material are suitable for geotechnical material. | Zheng Yingren Gao Hong Zheng Lushi | 2010 | Engineering Sciences2010，8，3： | 1 |
| 15 | In-Tunnel Blast Pressure Empirical Formulas for Detonations External, Internal and at the Tunnel Entrance显示文摘In order to define the loading on protective doors of an underground tunnel, the exact knowledge of the blast propagation through tunnels is needed. Thirty-three scale high-explosive tests are conducted to obtain in-tunnel blast pressure for detonations external, internal and at the tunnel entrance. The cross section of the concrete model tunnel is 0.67 m2. Explosive charges of TNT, ranging in mass from 400 g to 4 600 g, are detonated at various positions along the central axis of the model tunnel. Blast gages are flush-installed in the interior surface of the tunnel to record side-on blast pressure as it propagates down the tunnel. The engineering empirical formulas for predicting blast peak pressure are evaluated, and are found to be reasonably accurate for in-tunnel pressure prediction. | LI Xiudi ZHENG Yingren | 2006 | Transactions of Tianjin University2006，12，B09： | 1 |
| 16 | Mechanisms of fibrosis in acute liver failure显示文摘 | Yingli He Li Jin Jing Wang Zhi Yan Tianyan Chen Yingren Zhao | 2015 | Liver Int2015，，7： | 1 |
| 17 | Energy properties of sandstone in the process of deformation failure under compression condition显示文摘 | ZHAO Baoyun ZHENG Yingren LI Ziyun | 2016 | Journal of Liaoning Technical University(Natural Science)2016，35，10： | 1 |
| 18 | Mulit-yield surface model for soils on the basis of test fitting 显示文摘 | Zheng Yingren Yan Dejun | 1994 | Computer Methods and Advances in Geotechnics1994，，1： | 1 |
| 19 | Expert Consensus on the Prevention and Treatment of Hemorrhagic Fever with Renal Syndrome显示文摘Hemorrhagic fever with renal syndrome(HFRS)is an acute zoonosis with a global distribution.China is one of the countries with a high incidence of HFRS,which has long endangered the lives and health of the Chinese people.The Infectious Disease Branch of the Chinese Preventive Medicine Association and the Infectious Diseases Branch of the Chinese Medical Association organized national multidisciplinary experts,based on domestic and international research results combined with experts’practical experiences,to reach this consensus after thorough discussion.This consensus contains 17 recommendations aimed at prevention and identification of important clinical issues to further standardize the prevention,diagnosis,and treatment of HFRS. | Hong Jiang Changxing Huang Xuefan Bai Fuchun Zhang Bingliang Lin Shiwen Wang Zhansheng Jia Jingjun Wang Jing Liu Shuangsuo Dang Yingren Zhao Xiaoguang Dou Fuqiang Cui Wenhong Zhang Jianqi Lian Guiqiang Wang Zhiliang Gao | 2022 | Infectious Diseases & Immunity2022，2，4： | 1 |
| 20 | Research on the application of yield criterion in geotechnical engineering显示文摘 | Xu Gancheng Zheng Yingren | 1990 | Chinese Journal of Geotechnical Engineering1990，12，2： | 1 |
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