土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (5): 718-723.

• 工程实录 • 上一篇    下一篇

老挝南俄四水电站边坡坝基F22断层工程特性研究及处理措施

柳旻1,2，夏玉云1,2，杨晓鹏1,2，王冉1,2，郭天森1,2，程泳祥1,2   

  1. （1.机械工业勘察设计研究院有限公司，西安 710043；2.陕西省特殊岩土性质与处理重点实验室，西安 710043）
  • 收稿日期:2022-04-11 修回日期:2022-05-06 出版日期:2022-10-30 发布日期:2022-10-24
  • 作者简介:柳旻（1988-），男，工程师，研究方向为岩土体稳定性及其工程环境效应。
  • 基金资助:
    CMEC 专项科技孵化项目(CMEC-KJFH-2018-02);陕西省科技统筹创新工程计划项(2016KTZDSF04-05-01);陕西省“三秦学者”创新团队支持计划资助(2013KCT-13);国机集团科技发展基金（SINOMACH09）

Engineering Characteristics and Mitigation Measures of F22 Fault in Namyo Ⅳ Hydropower Station in Laos

LIU Min1,2, XIA Yuyun1,2, YANG Xiaopeng1,2, WANG Ran1,2, GUO Tiansen1,2， CHENG Yongxiang1,2   

  1. (1.China Jikan Research Institute of Engineering Investigations and Design, Co. Ltd., Xi’an 710043；
    2.Shaanxi Key Laboratory of Special Geotechnical Properties and Treatment, Xi’an 710043)
  • Received:2022-04-11 Revised:2022-05-06 Online:2022-10-30 Published:2022-10-24

摘要： 老挝南俄四水电站右岸边坡发育F22断裂，穿越大坝10#坝段坝基，将其划分为碎裂岩带和软弱构造岩带（岩屑夹泥型）。为了提供该水电站工程设计所需的工程地质资料，在查明F22断层发育几何学特征的基础上，通过勘探技术、取样室内物理力学性质试验、压水试验研究，查明断裂破碎带的性状，包括分布及规模、矿物成份、物理力学性质、工程特性，同时研究对应的处理措施。结果表明:泥质板岩内未发现蒙脱石等高膨胀性矿物；崩解试验发现泥质板岩在浸水后很快发生软化分散，证明泥质板岩水理性质较差，粉砂质板岩水理性尚可；在坝基F22断层带上游侧布置有齿槽，可解决坝基渗透问题；在断层带附近采用混凝土垫座“桥接”跨越断层，可解决坝基变形问题。研究成果可为其它工程类似断层性状研究提供参考。

关键词: F22断层, 边坡, 坝基, 工程特性, 处理措施

Abstract: The F22 fault is developed on the right bank slope of Nanyo 4 hydropower station in Laos, it passes through JHJ10 section of the dam foundation.  The lithology is divided into cataclastic rock belt and soft tectonic rock belt (debris and mud type). To provide the engineering geological data necessary for the engineering design of hydropower stations and to quantify the geometric characteristics of F22 fault development, geological investigation exploration, in-situ and laboratory physical and mechanical properties tests, water pressure test were conducted. Characteristics of the fracture zone, including distribution and size, mineral composition, physical and mechanical properties and engineering characteristics, are also investigated. The results show that there are no high expansive minerals such as montmorillonite exist in the argillaceous slate. The disintegration test indicates that the argillaceous slate softs and disperses quickly after soaking in water, which proves that the argillaceous slate has poor hydrologic properties, and the silty slate has good hydrologic properties. There are grooves on the upstream side of F22 fault zone in the dam foundation, which can solve the seepage problem in dam foundation. The deformation of the dam foundation can be mitigated by “bridging” the fault with concrete pad near the fault zone.



Key words: F22 Fault, Slope, Dam Foundation, Engineering Characteristic, Treatment Measure

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