Investigation of meso-failure behavior of rock under thermal-mechanical coupled effects based on high temperature SEM

查看全文 作　　者：ZUO [1,2]JianPing;XIE [2,3]HePing;ZHOU [1,2]HongWei

机构地区：[1]State Key Laboratory of Coal Resources and Mining Safety,China University of Mining and Technology,Beijing 100083,China;[2]Institute of Rock Mechanics and Fractals,China University of Mining and Technology,Beijing 100083,China;[3]Sichuan University,Chengdu 610065,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2012年第55卷第10期,共8页

基　　金：supported by the National Natural Science Foundation of China(Grant No.11102225);the Special Funds for Major State Basic Research Project(Grant Nos. 2010CB732002 and 2011CB201201);the National Excellent Doctoral Dissertation of China(Grant No.201030);the Beijing Nova Program (Grant No.2010B062);the New Century Excellent Talents in University(Grant No.NCET-09-0726) 摘　　要：It is extremely important to study and understand the deformation behavior and strength characteristics of rocks under thermal-mechanical(TM) coupling effects.Failure behavior and strength characteristics of Pingdingshan sandstone were investigated at room temperatures up to 300oC in an internally heated apparatus and tensile load through meso-scale laboratory experiments in this work.33 experiments have successfully been conducted for Pingdingshan sandstone.Experimental results indicated that the tensile strength increased slowly with temperatures from 25oC to 100oC,and then sharply jumped from 100oC to 150oC,and finally decreased slightly with temperatures from 150oC to 300oC.And about 150oC is the threshold temperature of strength and thermal cracking.At low temperatures(25oC-150oC),sandstone strength is determined by relatively weak clay cement.However,at higher temperatures(150oC-300oC),because of the strength enhancement of clay cement,sandstone strength is controlled by both mineral particles and clay cement.The effects of cement clay,micro-cracks closing,and thermal cracking were the possible reasons for our detailed analysis.In addition,the typical fracture position maps and nominal stress-strain curves indicated that the temperature had strong effects on the failure mechanism of sandstone.The fractograph implied that the dominant fracture mechanism tended to transform from brittle at low temperatures to ductile at high temperatures. 关键词：破坏行为耦合作用岩石机械高温 SEM 实验室试验强度特性

相关文献

参考文献（19）
引证文献（7）
耦合文献（7）

参考文献(19)

引证文献(7)

耦合文献(7)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Investigation of meso-failure behavior of rock under thermal-mechanical coupled effects based on high temperature SEM

参考文献(19)

引证文献(7)

耦合文献(7)

用户提示