| 摘要: |
| 【目的】研究均质土坝坝基、坝肩混凝土防渗墙及其与土体接触面的应力变形特性，为工程设计提供依据。【方法】结合在建的陕西榆林横山县王圪堵水库混凝土防渗墙的均质土坝工程，在研究建立应力变形计算模型及计算方案的基础上，运用三维非线性有限元法，对施工期和运行期大坝典型断面、防渗墙及其与土体接触面的应力变形特性进行分析。【结果】在施工期和运行期，局部坝段的坝基防渗墙上部及左坝肩防渗墙左半部分区域存在小范围的拉应力区，但防渗墙不产生抗拉破坏；局部坝段的坝基防渗墙上部和左坝肩防渗墙大部分区域，以及防渗墙与上、下游土体之间的接触面，均存在拉应力区及剪切破坏区。【结论】为确保大坝安全，建议在坝基混凝土防渗墙周边尤其是在防渗墙与坝体填土衔接部位，设置变形过渡层，以改善接触面的应力状况。 |
| 关键词: 均质土坝 混凝土防渗墙 接触面 应力变形特性 |
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| 基金项目:国家自然科学基金项目（50779051） |
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| Research on stress deformation characteristic of foundation concrete cutoff wall of homogeneous earth dam |
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| Abstract: |
| 【Objective】The study was to research the stress-deformation characteristic of concrete cutoff wall of homogeneous earth dam foundation and dam abutment,and its contact face with the earth to provide a basis for engineering design.【Method】Combining the concrete cutoff wall of Wang Ge-Du homogeneous earth dam in the construction period in Yulin city,Shaanxi Province,the paper analyzed the stress deformation characteristic of typical cross section and concrete cutoff wall of the dam,and its contact face with the earth in the construction period and operation period on the basis of research on establishing computation model and computation scheme for stress deformation by using three-dimensional nonlinear finite element method.【Result】In the construction and operation period,in the upper part of cutoff wall of partial dam foundation and left part of cutoff wall of left dam abutment there exists small pulling stress area,but the cutoff wall will not occur tensile damage;in the upper part of partial dam foundation and most area leave dam abutment,contact face between cutoff wall and earth of upper and lower reaches there exist pulling stress area and shear failure area.【Conclusion】To protect the security of the dam,we advise that the interlocking layer surrounding the cutoff wall of dam foundation should be set,especially the conjunction part between cutoff wall and the dam earth part,so that the stress condition of the contact face could be improved. |
| Key words: homogeneous earth dam concrete cutoff wall contact face stress-deformation characteristic |
