不对称发育深卸荷地质力学模式

韩刚; 赵其华; 彭社琴

不对称发育深卸荷地质力学模式 English Version

韩刚^{1, 2},
赵其华^1,2,,
彭社琴^{1, 2}

1. 地质灾害防治与地质环境保护国家重点实验室（成都理工大学）,四川成都 610059; 2. 成都理工大学环境与土木工程学院,四川成都 610059

基金项目: 国家自然科学基金项目（41272333）

详细信息

作者简介:
韩刚(1978- )，男，吉林省吉林人，博士，主要从事岩石高边坡方面的研究工作。E-mail: gang_han@126.com。

通讯作者:
赵其华

中图分类号: TU45
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出版历程
- 收稿日期: 2013-01-04
- 发布日期: 2013-11-19

Geomechanical model for asymmetric distribution of deep-seated crack

HAN Gang^{1, 2},
ZHAO Qi-hua^1,2,,
PENG She-qin^{1, 2}

1. State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection (Chengdu University of Technology), Chengdu 610059, China; 2. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 揭示不对称发育深卸荷空间分布规律、变形破坏类型及地质力学模式。以白鹤滩水电站深卸荷为典型实例,基于现场调查、精细描述,分析深卸荷空间分布特征、变形破坏特征、变形破坏类型,结合河谷演化历史,揭示深卸荷岩体能量演化过程,从能量存储、释放角度建立不对称发育深卸荷地质力学模式。研究表明：深卸荷分布于距边坡表面水平、垂向深度均为50～150 m空间范围,均处于历次谷底高应力集中影响范围；深卸荷变形破坏类型可划分为3类：继承性拉张型、新生性张剪型与错动扩展型；偏移-下切河谷演化使左岸岩体经历多次循环加卸载过程,能量演化过程具有区别于右岸的三高特点：储存量高,耗散量高,强度劣化程度高,这是深卸荷不对称分布的根本原因；深卸荷地质力学模式可概括为先期沿结构面与岩桥拉裂,以及后期沿缓倾角错动带产生的滑移-拉裂；深卸荷形成过程可概括为3阶段：损伤加剧与强度劣化阶段、局部拉应力形成阶段、错动扩张阶段。
- 岩石力学 /
- 深卸荷 /
- 不对称发育 /
- 地质力学模式 /
- 能量演化
Abstract: The spatial distribution, deformation type and geomechanical model of asymmetric deep-seated crack (DSC) are analyzed. Taking Baihetan Hydropower Station as a typical example, the spatial distribution characteristics, deformation characteristics and deformation types are investigated by means of the integration methods of field investigation and fine description. Furthermore, a geomechanical model for DSC is proposed based on the view of energy evolution process. The spatial distribution range of DSC is between about 50 m and 150 m in vertical direction and horizontal direction from the surface of rock slope, and is located in the influence range of stress concentration of valley bottom. According to the deformation characteristics, the deformation types of DSC can be divided into three ones: tensile type, tensile-shear type and slippage-splitting type. The rock mass of the left bank has experienced several cyclic loading-unloading processes accompanied by the migration-incision evolution process of Jinsha River at dam site. Different from that of the right bank, the energy evolution process of the left bank has three significant differences: high storage, high dissipation and high strength degradation degree, which are the primary reason of asymmetric distribution of DSC. The formation-driving force of DSC is the tensile stress caused by differential rebound or stress concentration, and the slippage of shear belt makes DSC remarkable. The geomechanical model of asymmetric DSC can be divided into two types: one type is based on tectonic discontinuities and intact rock bridge; and the other is based on shear belt slippage. The formation process can be summarized into three stages successively: damage and strength degradation, local tensile stress formation and slippage splitting.
- rock mechanics /
- deep-seated crack /
- asymmetric distribution /
- geomechanical model /
- energy evolution

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