Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station

MENG Guo-tao; XU Wei-ya; YANG Sheng-qi; LIU Jin-tang; YAN Xin-chun

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Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station

更新时间：2026-06-25

- Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station
- Vol. 29, Issue 6, (2008)
- 作者机构：
  
  1. 河海大学岩土工程研究所,南京,210098
  2. 中国水电顾问集团昆明勘测设计研究院,昆明,650051
  3. 景洪水电工程建设管理局，云南景洪,666100
- 作者简介：
- 基金信息：
- DOI：
  CLC： TV223
- Online First：15 July 2013，
  
  Published：2008
- 稿件说明：
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MENG Guo-tao, XU Wei-ya, YANG Sheng-qi, et al. Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station[J]. 2008, 29(6).
DOI：

MENG Guo-tao, XU Wei-ya, YANG Sheng-qi, et al. Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station[J]. 2008, 29(6). DOI：

摘要

G23挤压蚀变破碎带是某水电站坝基的主要工程地质问题。通过对该水电站枢纽区新构造运动及构造体系特征的综合分析，探讨了G23挤压蚀变破碎带的成因机制。基于典型岩样的物相及微形貌试验成果，分析了G23带构造岩的岩性特征，明确了G23带岩体的物理性质及其转变特征，预测了该挤压蚀变破碎带在工程作用下的变化趋势。结合蚀变岩样三轴压缩试验的变形破坏规律，阐述了G23带对工程作用的响应及其对工程的影响。

Abstract

The G23 mylonitization and fractured belt located in the dam-foundation of a hydropower station is a main engineering geological problem of the project. Its genesis mechanism has been analyzed based on the characteristics of the new tectonic movement and the tectonic system. With the X-ray diffraction and scanning micrograph analysis

the main mineral components and microstructures of either the fractured rock or the phyllonite are identified. With the conventional triaxial compression testes

the stress-strain characteristic of G23 belt rock is examined. In conjunction with site specific analyses

the pre-existing state of rock mass in G23 belt is expounded. At last

based on physico-mechanical properties

the mass rock’s engineering characteristics are estimated; the influences of the G23 belt are discussed; and the main problems which should be study further are put forward.

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