土的空间破坏面及其抗剪强度  

The failure surface and relevant shear strength of soil

作　　者：刘金龙[1] 刘洁群[2] 陈陆望[3] 汪东林[4] 

机构地区：[1]合肥学院建筑工程系,安徽合肥230022 [2]中国科学院安徽光学精密机械研究所,安徽合肥230031 [3]合肥工业大学资源与环境学院,安徽合肥230009 [4]安徽建筑工业学院土木工程学院,安徽合肥230022

出　　处：《西安建筑科技大学学报（自然科学版）》2009年第1期69-75,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：安徽省高等学校省级自然科学研究项目(KJ2008B259);合肥学院引进人才启动基金项目(RC027)

摘　　要：岩土空间破坏面位置的确定与计算所选用的破坏准则有关,运用不同的破坏准则得到的土体的破坏面位置及相应抗剪强度也不同.基于最大剪应力、最大剪正应力比和空间滑动面破坏准则,通过建立Lagrange函数求条件极值的方法推导了不同破坏准则条件下岩土空间破坏面的位置及相应的抗剪强度,并得到了这些抗剪强度与现有常用破坏准则间的相互关系.进而针对已求得的不同破坏准则条件下的抗剪强度,通过数值分析探讨了中主应力对土的抗剪强度的影响.分析结果表明,中主应力对土的抗剪强度有显著的影响,一般地在平面应变条件下这种影响达到最大.The position of the geotechnical failure surface is relative to the failure criteria,and different positions and relevant shear strengths can be got by using different failure criteria. Based on the failure criteria of maximal shear stress, maximal ratio of shear-normal stress and the spatial mobilization plane failure criterion, failure surface＇s positions and relevant shear strengths are studied in the 3D stress space by using extremum method of Lagrange. It demonstrated that the results of relevant shear strengths were consistent with existing failure criteria. In comparison with the relevant shear strengths, the strength parameters for different intermediate principle stresses are generally studied. It is shown that the intermediate principle stress has a considerable effect on shear strength parameters of soils, and this effect will be most significant at plane-strain condition.

关 键 词：空间破坏面 抗剪强度 破坏准则 中主应力 

分 类 号：TU452[建筑科学—岩土工程]