拱坝坝基下残留强风化岩层处理措施及计算方法研究  

Treatment Measures and Computational Methods for Remnant Strong Weathering Rock under Foundation of Arch Dam

作　　者：舒仲英[1] 张镭漓[1] 曾兼权[1] 

机构地区：[1]四川大学水利水电学院,成都610065

出　　处：《中国农村水利水电》2007年第6期70-74,共5页China Rural Water and Hydropower

摘　　要：拱坝坝基变形过大会导致拱坝坝身开裂,从而影响整个工程的安全。以重庆市下涧口拱坝坝基残留强风化岩层引起坝身开裂为例,采用三维非线性有限元法,用ANYSY大型通用计算软件模拟出下涧口工程的具体情况,分析研究了处理坝基的2种措施灌浆法和混凝土封闭法,通过软件强大的后处理功能得出坝基在处理前后的变位、应力及应变值,对比分析得出了经过处理后强风化岩层地基承载力增强,稳定性提高的结论。并用基面荷载倍比放大法和强降法计算分析了经过处理后地基的安全储备,论证了措施的科学合理性,不仅解决了该工程的病害问题,还可以为类似工程提供经验和参考。Excessive distortion of arch dam foundation will induce crack of dam, and will affect the security of whole project. The paper studies the remnant strong weathering rock under the foundation resulting in crack of the Xiajiankou arch dam in Chongqing. The method of 3-D nonlinear finite element and ANSYS, a large universal computer software package, is used to simulate the detailed situation of the project. Two kinds of treatment measures for foundation-grouting and concrete-occluding are analyzed. With the strong capacity of background disposal, the displacement, stress and strain of foundation are educed, and the conclusion is obtained that the carrying capacity and stability of the foundation are improved through comparison. The scientific rationality of the foundation treatment is demonstrated by the security analysis using load-magnifying method and intensity-decreasing methods. The research not only solves problem of this project, but also provides experience and reference to similar projects.

关 键 词：拱坝开裂 下涧口拱坝 强风化岩层 非线性有限元 处理措施 

分 类 号：TV642.4[水利工程—水利水电工程]