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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。
Arch dam deformation over the General Assembly led to arch dam body cracking, thus affecting the safety of the entire project. Taking Xiajiankou arch dam foundation of Chongqing Municipality as an example, the dam body cracking caused by strong weathered rock strata is taken as an example. The three-dimensional nonlinear finite element method is used to simulate the specific conditions of Xiajiankou project with ANYSY large general purpose calculation software. Two kinds of measures: grouting method and concrete confining method. The displacement, stress and strain of the dam foundation before and after treatment are obtained through the powerful post-processing function of the software. The contrasted and analyzed results show that the bearing capacity of the strong weathered rock strata after the treatment is enhanced and the stability Raise the conclusion. The safety reserve of treated foundation was calculated and analyzed by the method of base load multiples magnification and strong drop method. The scientific rationality of the measures was demonstrated. It not only solved the disease problem of the project, but also provided experience and reference for similar projects.