复杂地基上重力坝深层抗滑稳定降强法试验研究  

Study on Intensity Reduction Method Test of Stability Against Deep Sliding of Gravity Dam on Complex Rock Foundation

作　　者：董建华[1,2] 张林[1,2] 杨宝全[1,2] 陈建叶[1,2] 

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试验室,四川成都610065 [2]四川大学水利水电学院,四川成都610065

出　　处：《水利与建筑工程学报》2014年第4期72-76,共5页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51379139;51109152)

摘　　要：重力坝坝基中软弱结构面强度弱化行为是影响大坝稳定的一个重要因素。地质力学模型降强法试验是研究该问题的重要途径,模型采用变温相似材料实现了降强法试验,并对变温相似材料及其相应的试验技术做进一步的研究。利用最小二乘法原理,从理论上拟合了抗剪断强度参数与温度之间的关系曲线,通过拟合公式确定了强度幅度与其所对应的温升值。研究成果应用于某重力坝工程中,将降强与超载相结合,开展了该重力坝整体稳定综合法破坏试验,获得坝与地基的变位特性、破坏形态和破坏机理,提出该重力坝降强法试验安全系数和综合稳定安全度,评价了工程安全性。The intensity weakening behavior of weak structural plane in the dam foundation is an important factor influencing the stability of gravity dams .The geo-mechanical model test with intensity reduction method is an important way to study this problem .The test was conducted by using temperature analogous materials ,further research was done on this material and its corresponding test techniques .By using the least squares principle ,the relation curves between shear strength parameters and temperature fitted theoretically .In the test ,according to the fitting formula ,the shear strength and the corresponding increase of temperature value were calculated .The research results were applied to a gravity dam project ,in which the comprehensive destruction test of overall stability was carried out combining the intensity reduction method and overloading method . Through the test , the deformation characters of the dam and foundation , the failure modes and mechanism were obtained .Moreover ,the safety coefficient of intensity reduction method and safety degree of comprehensive stability on this gravity dam were proposed ,and the safety of the project was evaluated .

关 键 词：重力坝 软弱结构面 强度弱化 变温相似材料 降强法试验 

分 类 号：TV321[水利工程—水工结构工程]