【摘要】 某土石围堰堰基存在深厚覆盖层，其承载能力不足、不均匀沉降等诸多问题，给工程稳定性带来了严峻挑战。在深厚覆盖层地基上修筑土石围堰，基础处理难度大，围堰失稳风险高。为此，采用非线性有限元法，对某工程深厚覆盖层土石围堰施工全过程进行数值计算，研究施工过程中围堰的应力变形特性，并进一步模拟大坝基坑开挖及设计洪水位对围堰应力变形的影响。研究结果揭示了深厚覆盖层土石围堰施工及运行阶段的力学响应规律，并论证了该土石围堰结构设计合理性。更多还原

【Abstract】 The foundation of a certain earth-rock cofferdam has a deep overburden layer, which has insufficient bearing capacity and various problems such as uneven settlement, posing severe challenges to the stability of the project. Constructing an earth-rock cofferdam on a deep overburden layer foundation is difficult in terms of foundation treatment, and the risk of cofferdam instability is high. Therefore, the nonlinear finite element method was adopted to conduct numerical calculations on the entire construction process of the earth-rock cofferdam in a certain project, studying the stress and deformation characteristics of the cofferdam during the construction process, and further simulating the influence of the dam foundation excavation and the designed flood level on the stress and deformation of the cofferdam. The research results revealed the mechanical response laws of the deep overburden layer earth-rock cofferdam during construction and operation, and demonstrated the rationality of the structure design of this earth-rock cofferdam.更多还原