贵州岩溶地区输水渡槽的基础选型分析

谢红建; 吴擎文; 杨文

doi:10.11932/karst20190417

贵州岩溶地区输水渡槽的基础选型分析

doi: 10.11932/karst20190417

1.
贵州省水利水电勘测设计研究院，贵阳 550002
2.
贵州省水利投资（集团）有限责任公司，贵阳 550002

基金项目: 黔科合重大专项字（〔2017〕3005-1 号）

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出版历程
- 发布日期: 2019-08-25

Analysis of foundation selection of a water-transmission aqueduct across a karst area in Guizhou Province

1.
Institute of Water Conservancy and Hydropower Survey and Design of Guizhou Province, Guiyang，Guizhou 550002，China
2.
Water Conservancy Investment (Group) Co., Ltd.of Guizhou Province, Guiyang ，Guizhou 550002，China

摘要

摘要: 贵州一输水渡槽跨越岩溶区域，可能会产生岩溶塌陷、向临空面失稳等工程地质问题。本文在地质钻探、物探和现场调查的基础上，通过基于地质力学的地质轮廓法进行裂隙配套，判断节理裂隙性质及其对岩溶的影响，结合深浅埋洞穴的界定初步判断其稳定性，并采用基于规范、标准的半定量稳定性分析及含节理裂隙的二维有限元分析、三维有限差分分析，从位移、应力分布及塑性区发展及破坏模式角度来判断溶洞在上部荷载作用下的稳定性。研究表明：本工程溶洞顶板的受力同深梁的受荷模式，节理裂隙很大程度上影响顶板的稳定性，顶板容易沿节理裂隙和层面产生剪切、拉伸作用。最后结合长期安全稳定运行综合给出基础选型建议。
- 地质轮廓法 /
- 深浅埋洞穴 /
- 数值分析 /
- 基础选型
Abstract: A water-transmission aqueduct crosses a karst area of Guizhou Province, which may cause engineering geological problems such as karst collapse and instability of slopes. On the basis of geological and geophysical surveys and drilling property of joints and cracks and their effects on karst are analyzed using the geological outline method, and the stability of buried karst caves is assessed. Standard semi-quantitative analysis and 2D- and 3D FEM analyses containing joints and fractures are performed to further examine the stability of karst caves under overlying loads from the perspectives of displacement, stress distribution, development of plastic zones and failure modes. Research shows that the stress of the roof of the karst cave beneath the project site is similar to that of a loaded beam at depth, in which joints and fractures can have a great impact on the stability of the roof. Shearing and extension are easy to occur along these discontinuities. Based on such analysis, a proper type of foundation is recommended for the long-term safety and stability of the planned aqueduct.
- concealed karst cave /
- geological profile method /
- deep and shallow cave /
- numerical analysis

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