基于统计损伤模型的顺倾层状岩质边坡失稳分析  

Instability analysis of bedding rock slope based on the statistical constitutive damage model

作　　者：张力民[1,2] 吕淑然[3] 张吉宏[4,5] 刘红岩[6,7] 

机构地区：[1]北京科技大学土木工程与环境学院,北京100083 [2]河北承德钢铁公司,河北承德067002 [3]首都经济贸易大学安全与环境工程学院,北京100026 [4]长安大学地质工程与测绘学院,西安710064 [5]中国有色金属工业西安勘察设计研究院,西安710054 [6]中国地质大学(北京)工程技术学院,北京100083 [7]西藏大学工学院,拉萨850000

出　　处：《工程勘察》2014年第9期7-10,29,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(41002113;41162009);中国地质大学(北京)基本科研业务费专项资金资助项目(2-9-2014-019);2011年度北京市属高等学校人才强教深化计划人才创新团队项目(PHR201107143)

摘　　要：溃屈破坏是顺倾层状岩质边坡的主要失稳破坏形式之一,类似于经典的欧拉压杆失稳理论,但又有着明显的差异。本文在对二者异同的力学本质进行阐述的基础上,首先基于前人研究成果,把自重荷载作用下直立岩层不致发生溃屈失稳破坏的临界高度计算公式推广到一般的顺倾层状岩质边坡。结果表明,由本文提出的计算方法得到的顺倾层状岩质边坡不致发生溃屈失稳破坏的临界高度仅约为其他研究者相应计算结果的75%。同时,基于岩石力学行为服从统计损伤模型的假设,提出了相应的顺倾层状岩质边坡失稳计算模型,作为对上述计算方法的改进和完善。通过研究计算参数m、ε0的变化对计算结果的影响发现,二者对计算结果有较大影响,这说明在类似问题中考虑岩石的损伤演化特性是十分必要的。Buckling failure is one of the main instability failure modes,which is similar to classic Euler pressure bar instability failure theory,but there is much difference between them.On basis of stating the mechanical essence of their similarities and differences,the calculation formula of critical height,under which the vertical rock layer will not buckle to failure under self-gravity load,is firstly deduced based on the relevant results of other researchers,and then it is extended to the general bedding rock slope.The result shows that the critical height of the bedding rock slope calculated by the method proposed in this paper is 75% that of other researchers.Meanwhile,based on the hypothesis that the mechanical property of rock obeys the statistical damage model,the according instability calculation model of the bedding rock slope is proposed,which is regarded as the improvement to the aforesaid method.Through the influencing study of the calculation parameters,m and ε0on the results,it is found that the parameters would effectthe results,and that it is very necessary to consider the damage evolution of rock in these similar problems.

关 键 词：顺倾层状岩石边坡 压杆失稳 自重荷载 临界高度 统计损伤模型 

分 类 号：P642.22[天文地球—工程地质学]