含层间剪切带复合岩体失稳机制的突变理论分析  

Analysis of instability mechanism of composite rock mass with interlayer shear zone by catastrophe theory

作　　者：闫长斌[1] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《中南大学学报（自然科学版）》2013年第10期4281-4286,共6页Journal of Central South University:Science and Technology

基　　金：国家"十一五"科技支撑计划项目(2006BAB04A06);黄河勘测规划设计有限公司自主研究开发项目(2009-ky34(2))

摘　　要：层间剪切带作为一种特殊的软弱结构面,常常构成威胁坝基、边坡、围岩稳定性的控制性因素。针对含层间剪切带复合岩体失稳破坏特点,考虑层间剪切带的非均质性,以含层间剪切带复合岩体系统为研究对象,运用突变理论方法,建立含层间剪切带复合岩体失稳的燕尾突变模型。根据建立的突变模型,在分析平衡曲面方程势函数极值点的个数及其表现形式的基础上,给出含层间剪切带复合岩体系统失稳的突跳特征和发展过程,并对层间剪切带发生错动破坏引起围岩系统失稳的演化过程进行分析。研究结果表明:含层间剪切带复合岩体的破坏形式及其演化过程取决于层间剪切带与围岩组成系统的稳定性,而系统的稳定性则与层间剪切带与相邻岩层间的相互作用是密切相关的。As a special soft structural plane, interlayer shear zones are controlling factors threatening the stability of dam foundation, slope and surrounding rock frequently. The swallowtail catastrophe model of composite rock mass with interlayer shear zones was established by the catastrophe theory with the composite rock mass system with interlayer shear zones being the integral study object, considering the instability failure characteristics of the composite rock mass with interlayer shear zones and the heterogeneity of interlayer shear zone. The jump properties and developing process of the instability of the composite rock mass system with interlayer shear zones were presented based on the catastrophe model and the analysis of the number and its behaviour styles of the potential function of equilibrium surface equations. The evolution procedure of the surrounding rock system instability resulted from the failure of interlayer shear zones was analyzed. The results show that the failure form and its evolution procedure of the composite rock mass with interlayer shear zones are dependent on the stability of the system made up of interlayer shear zone and surrounding rock. While the system stability is closely interrelated with the interaction between the interlayer shear zones and the adjacent strata.

关 键 词：岩石力学 层间剪切带 失稳破坏 突变理论 演化过程 

分 类 号：TU457[建筑科学—岩土工程]