含双斜结构面重力坝坝基失稳模式及破坏机理研究  

Study on instability mode and mechanism of gravity dam foundation with double-inclined structure planes

作　　者：邓子谦[1] 张林[1] 陈媛[1] 胡成秋[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室、水利水电学院,成都610065

出　　处：《水力发电学报》2014年第4期235-241,共7页Journal of Hydroelectric Engineering

基　　金：博士学科点专项科研基金(20100181110077);国家重点基础研究发展计划(973)项目(2010CB226802);国家自然科学基金(51109152)

摘　　要：软弱结构面对坝体抗滑稳定极为不利,尤其是当坝基存在多组不同软弱结构面组合时,其深度、范围、倾角等因素均对坝体稳定具有较大影响。武都重力坝最大坝高119.14m,其坝基地质条件十分复杂,其中断层F31、10f2、f115及f114组合形成多组双斜结构面,坝基深层抗滑稳定问题突出。为了探讨含双斜结构面重力坝坝基滑动失稳模式及破坏机理,采用三维地质力学模型试验方法,对武都重力坝坝基中的多组双斜结构面进行重点模拟,进行超载法破坏试验研究。试验得到了坝基的破坏过程和破坏形态,揭示了坝基的破坏机理,其中19#典型坝段超载安全系数Kp=3.0,坝基失稳模式为沿断层10f2和f115组成的双斜结构面的深层滑动破坏。最后,通过三维有限元计算验证了地质力学模型试验成果。研究成果为类似含双斜结构面重力坝的设计施工和加固处理提供了科学依据。Weak structural plane is disadvantageous to dam stability against sliding. Especially when many groups of different weak structural planes cooccur in dam foundation, their depth, range and angle could have significant effects on dam stability. The Wudu gravity dam of maximum height 119.14m has a complicated geological condition of foundation with faults F31, 1012, f115 and f114 that forms groups of double-inclined structure planes, so its stability against deep sliding is a very difficult problem. To explore this dam＇s sliding instability mode and failure mechanism, 3D geomechanical model tests were adopted and conducted focusing on simulation of these structure planes. The results of overloading failure test reveal the failure process, shape and mechanism of the dam and foundation and an overloading coefficient 3.0 of dam section No. 19. It was observed that the dam and foundation had become instable and developed deep sliding along the double-inclined structure planes formed by faults 1012 and fl15. In this paper, the model test results are verified by 3D FEM calculations. This study would lay a basis for design and reinforcement of gravity dams with double-inclined structure planes.

关 键 词：水工结构 深层抗滑稳定 破坏试验 双斜结构面 破坏机理 

分 类 号：TV321[水利工程—水工结构工程]