某水电站坝基G23挤压蚀变破碎带成因及工程性质分析

›› 2008, Vol. 29 ›› Issue (6): 1691-1696.

某水电站坝基G23挤压蚀变破碎带成因及工程性质分析

孟国涛¹，徐卫亚¹，杨圣奇¹，刘金堂²，晏新春³

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

收稿日期:2006-08-18 出版日期:2008-06-10 发布日期:2013-07-15
作者简介:孟国涛，男，1978年生，博士，主要从事工程地质、岩土力学与工程方面的研究

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

MENG Guo-tao¹, XU Wei-ya¹, YANG Sheng-qi¹, LIU Jin-tang², YAN Xin-chun³

1. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China; 2. Kunming Hydroelectric Investigation, Design and Research Institute, China Hydropower Engineering Consulting Group Co., Kunming 650051, China; 3. Jinghong Hydropower Project Construction & Management Bureau, Yunnan 666100, China

Received:2006-08-18 Online:2008-06-10 Published:2013-07-15

摘要/Abstract

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。

关键词: G23挤压蚀变破碎带, 成因, 结构构造, 物理力学性质, 水电站

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.

Key words: G23 mylonitization and fractured belt, fabric and structure, physico-mechanical properties, hydropower station

中图分类号:

TV 223

孟国涛，徐卫亚，杨圣奇，刘金堂，晏新春 . 某水电站坝基G23挤压蚀变破碎带成因及工程性质分析[J]. , 2008, 29(6): 1691-1696.

MENG Guo-tao , XU Wei-ya , YANG Sheng-qi , LIU Jin-tang , YAN Xin-chun . Genesis mechanism and engineering characteristics analysis of G23 mylonitization and fractured belt in dam foundation of a hydropower station[J]. , 2008, 29(6): 1691-1696.

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