摘要
【目的】为研究青藏高原高寒山区澜沧江沿岸的RS大型岸坡堆积体在水电站建成蓄水后的变形破坏情况及其机理,【方法】基于地质勘测资料和各类试验结果,以RS堆积体为研究对象,通过数值模拟试验结合离心试验的方式,对水库蓄水后RS堆积体的变形破坏情况和失稳破坏机理进行了分析探讨。【结果】结果显示:蓄水后RS堆积体的变形主要集中在堆积体上游侧中上部,此部位易发生局部失稳破坏,失稳破坏模式为推移式滑动破坏。【结论】结果表明:蓄水产生的上部拉裂缝为RS堆积体潜在滑动面上边界,堆积体中部的细颗粒富集层是堆积体边坡的潜在滑带,是堆积体失稳破坏的下部剪出口;库水对堆积体中部细颗粒富集层的软化崩解作用和入渗后产生的浮托力是导致RS堆积体失稳的重要原因。研究成果期望能为高原高寒山区大型岸坡堆积体研究提供参考依据。
[Objective]To study the deformation and failure of RS large bank slope deposit along the Lancang River in the alpine mountainous area of Qinghai-Tibet Plateau after the construction of hydropower station impounded and its mechanism.[Methods]Based on geological survey data and various test result,taking RS deposit as the research object,the deformation and failure of RS deposit and its instability failure mechanism were analyzed and discussed by means of numerical simulation test and centrifugal test.[Results]The deformation of RS deposit was mainly concentrated in the middle and upper part of the upstream side of the deposit,which was prone to local instability failure,and the failure mode was push sliding failure.[Conclusion]The result show that the upper tensile crack generated by water storage is the boundary of the potential sliding surface of RS deposit,and the fine particle enriched layer in the middle of the deposit is the potential sliding zone of the slope and the lower shear outlet of the instability failure of the deposit.The softening and disintegration effect of reservoir water on the fine-particle enriched layer in the middle of the deposit and the buoyancy force generated after infiltration are the important reasons for the instability of RS deposit.The research result are expected to provide reference for the study of large bank slope deposits in the alpine mountainous areas of the plateau.
作者
罗博
刘宇昊
涂国祥
张鑫
张燕媚
李安润
LUO Bo;LIU Yuhao;TU Guoxiang;ZHANG Xin;ZHANG Yanmei;LI Anrun(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,Sichuan,China)
出处
《水利水电技术（中英文）》
北大核心
2023年第8期156-166,共11页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(41472274)。
作者简介
罗博(1999-),男,硕士研究生,主要从事岩土工程及地质灾害防治方面的研究。E-mail:2529975720@qq.com;通信作者:涂国祥(1978-),男,教授,博士,主要从事堆积体工程地质特性及稳定性方面的研究。E-mail:pyk@cdut.edu.cn。
