岩土动力极限应变判据在边坡稳定分析中的应用  

Application of rock and soil's dynamic limit strain criterion in stability analysis of slope engineering

作　　者：赖杰[1,2] 郑颖人[2] 唐晓松[2] 刘云[3] 谭仪忠[4] 

机构地区：[1]火箭军工程大学士官学院,山东青州262500 [2]后勤工程学院军事土木工程系,重庆401311 [3]重庆交通大学土木工程学院,重庆400074 [4]中国人民解放军工程兵学院,江苏徐州221004

出　　处：《振动与冲击》2016年第17期13-18,共6页Journal of Vibration and Shock

基　　金：国家重点研究发展计划(973)项目(2011CB013600);国家自然科学基金(51378496;51178457);重庆自然科学基金(CSTC2013jcyjys0002)

摘　　要：岩土材料受力从弹性进入塑性,最终发展到破坏,材料的屈服与破坏不同,屈服表示材料从弹性进入塑性状态,破坏表示从塑性发展到工程失稳。对于理想弹塑性材料,应力表述的判据难以区分屈服与破坏,为此提出采用极限应变作为岩土材料的破坏判据。给出了岩土材料动力极限应变的求解模型与方法,并以动力极限应变作为破坏准则,它既可以表述动力作用下材料的点破坏或开裂破坏,当点破坏贯通形成破坏面时,还可以表述材料整体破坏。通过地震作用下动力边坡工程算例,得到边坡滑体起裂的位置、演化过程和起裂极限荷载;当边坡中极限应变区贯通时得到边坡整体破坏极限荷载,并与数值极限分析中(超载法、强度折减法)采用位移不收敛破坏准则的计算结果比较,基本一致,验证了极限应变法在动力分析中的可行性。When bearing external load,geotechnical material turns from elastic state to plastic state,eventually to destruction state. Material＇s yield state is different from its failure state. The yield state means that a material has developed from elastic state into plastic state. However,the failure state,means that a material has developed from plastic state into unstable state. For ideal elastic-plastic materials,stress criterion is difficult to distinguish between yield and failure. Here,the limit strain was proposed as a damage criterion for geotechnical materials. The solving model and method for the dynamic limit strain of geotechnical materials were put forward,and the dynamic limit strain was taken as a failure criterion. It could be used to express integral damage or local failure of materials under dynamic action. When point damages connect together to from a failure surface,the overall destruction could be described. Based on a slope project under earthquake action,the position of initial crack,the evolutionary process of the crack at the slope and the limit crack load were obtained. The limit load calculated with the limit strain criterion was in accordance with the results computed using the numerical limit analysis with the displacement unconverged criterion（ the overload method and the strength reduction method）,the feasibility of the limit strain criterion in the dynamic analysis was verified.

关 键 词：屈服 破坏 极限应变 破坏判据 地震作用 

分 类 号：P642.2[天文地球—工程地质学]