马来西亚某水电站倾倒边坡成因机制分析

Analysis of the formation mechanism of toppling slopein a hydropower station in Malaysia

倾倒边坡是水电站工程建设中经常遇到的一类边坡,对其稳定性及成因机制的分析和认识对于边坡的加固治理具有重要作用。以马来西亚某水电站倾倒边坡为例,详细阐述了其在开挖过程中产生倾倒变形破坏的发展过程。通过地质结构分析、现场调查等手段对其成因机制进行了分析。结果表明:某水电站边坡是由于自身岩体质量差、支护未及时、爆破开挖扰动等三方面主要原因引起倾倒变形,下方边坡开挖爆破措施不当成为其变形破坏的诱因,导致发生倾倒变形破坏。在此基础上,提出了削方压脚、预应力锚固、格栅梁加固的综合治理措施。计算结果表明加固处理后的边坡处于稳定状态。

The toppling slope is a kind of slope frequently encountered in the construction of hydropower station.The analysis of its stability and genetic mechanism plays an important role in the reinforcement of slope.For an example of the toppling slope of a hydropower station in Malaysia,the development process of toppling deformation and failure during excavation is described in detail.The genetic mechanism and stability are analyzed by means of geological structure analysis and field investigation.The result shows that the toppling deformation is caused in the slope of a hydropower station due to three main reasons,poor quality of its own rock mass,the untimely support and disturbance of blasting excavation.The improper measurement of blasting and excavation of the lower slope becomes the inducement to result in toppling deformation and failure.On the basis of this,the paper puts forward the comprehensive treatment measures of cutting the slope to firm the foot,prestressed anchorage and grid beam reinforcement.The calculation result indicates that the slope is stable after the reinforcement treatment.