In-situ stress field evolution of deep fracture rock mass at dam area of Baihetan hydropower station

HAN Gang; ZHAO Qi-hua; PENG She-qin

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In-situ stress field evolution of deep fracture rock mass at dam area of Baihetan hydropower station

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- In-situ stress field evolution of deep fracture rock mass at dam area of Baihetan hydropower station
- Vol. 32, Issue S1, (2011)
- 作者机构：
  
  1. 成都理工大学环境与土木工程学院,成都,610059
  2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都,610059
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：16 May 2011，
  
  Published：2011
- 稿件说明：
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HAN Gang, ZHAO Qi-hua, PENG She-qin. In-situ stress field evolution of deep fracture rock mass at dam area of Baihetan hydropower station[J]. 2011, 32(S1).
DOI：

HAN Gang, ZHAO Qi-hua, PENG She-qin. In-situ stress field evolution of deep fracture rock mass at dam area of Baihetan hydropower station[J]. 2011, 32(S1). DOI：

摘要

还原深部破裂岩体赋存地应力场演化过程，研究深部破裂岩体成因、形成年代及发展演化趋势。以岩体深部破裂特征为基础，结合构造演化、河谷演化及浅生改造理论，采用数值模拟方法，从地应力场变化及应变能释放角度解释深部破裂形成演化过程。研究表明，宽谷期大规模夷平作用使深部破裂赋存应力场发生根本性改变，与现今应力场趋于一致，但并未导致深部破裂形成；侧向卸荷是深部破裂形成的主要原因，侧向卸荷导致主应力减小，但方向维持不变，当侧向临空面出现，伴随应变能释放，NW向结构面拉张形成具有继承性的NW向深部破裂；错动带的差异回弹形成残余拉应力，导致NE向新生性深部破裂形成；深部破裂形成地质年代应大致对应于Ⅲ级阶地形成初期，即Q2晚期～Q3早期阶段

Abstract

The in-situ stress field evolution process

formation cause

formation time and evolution trend of deep fracture is analysed. Combined with deep fractures characteristic，tectonic evolution

valley evolution and near surface action theory

the formation and evolution process are summarized by stress field change and strain energy release with numerical simulation. The results show that: deep fractures in-situ stress field is fundamentally changed after vertical unloading; but deep fractures are not formed in this in-situ stress environment; the primary reason of deep fractures formation is lateral unloading and residual tensile stress caused by difference resilience; the formation time of deep fractures is about after Ⅲ terraces appearance

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