Quality evaluation of unloaded slope rock mass

WANG Rui-hong; LI Jian-lin; JIANG Yu-zhou; WANG Le-hua; LI Hong-xin

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Quality evaluation of unloaded slope rock mass

更新时间：2026-06-25

- Quality evaluation of unloaded slope rock mass
- Vol. 29, Issue 10, (2008)
- 作者机构：
  
  1. 武汉大学水利水电学院,武汉,430071
  2. 三峡大学三峡库区地质灾害教育部重点实验室,宜昌,443002
  3. 河海大学岩土工程科学研究所,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：03 August 2013，
  
  Published：2008
- 稿件说明：
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WANG Rui-hong, LI Jian-lin, JIANG Yu-zhou, et al. Quality evaluation of unloaded slope rock mass[J]. 2008, 29(10).
DOI：

WANG Rui-hong, LI Jian-lin, JIANG Yu-zhou, et al. Quality evaluation of unloaded slope rock mass[J]. 2008, 29(10). DOI：

摘要

正确评价开挖后岩体质量并对其进行分类，对研究岩石边坡开挖卸荷后的稳定性有十分重要的意义。以某水电站坝肩高边坡开挖工程为背景，运用卸荷岩体力学的理论与方法，对坝肩边坡开挖岩体进行三维有限元分析。根据边坡岩体开挖后应力应变场的动态变化情况，确定岩体开挖卸荷后质量损伤劣化程度，并根据岩体开挖卸荷后的力学参数，采用RMR法对开挖后的边坡岩体质量进行评价。结果表明，边坡岩体RMR值随开挖后卸荷量的增大基本呈线性递减趋势，进而考虑开挖卸荷影响因素，修正了RMR法中的评价参数，为以后用该法评价开挖后的岩体质量提供参考。

Abstract

Rock mass quality has great influence on rock slope stability. So it is very important and necessary to re-classify the rock mass and evaluate its quality correctly after excavation. Based on the unloading rock mass mechanics theory

the arch dam abutment excavated high slope of one power station is analyzed by finite element method. Comparing initial stress field with excavation stress field

the rock mass unloading degree is studied; and then the degree of rock mass quality deterioration after excavation is also gained. With the progress of excavation

areas and degree of unloading change constantly. In order to simulate the influence of dynamic unloading

the rock mass mechanical parameters are adjusted continually according to the changing areas and degree of unloading after every excavation step. And considering the effects of excavation and unloading

the rock mass quality is re-evaluated with RMR method according to the rock mass mechanical parameters after excavation. The results show that the RMR value of slope rock decreases linearly with the increase of unloading degree. On the basis of the relationship between RMR value and unloading degree

considering unloading as an important influential factor

the evaluating parameters of the RMR method are revised

which has referential value for rock mass quality evaluation after excavation.

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