Analysis on the effects of the confining pressure and pore pressure on the stress-strain curve of rock mass and the mechanism of
the rainfall-induced Landslides

YANG Ji-hong; QIN Si-qing; YANG Sheng-wei

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Analysis on the effects of the confining pressure and pore pressure on the stress-strain curve of rock mass and the mechanism of the rainfall-induced Landslides

更新时间：2026-06-25

- Analysis on the effects of the confining pressure and pore pressure on the stress-strain curve of rock mass and the mechanism of the rainfall-induced Landslides
- Vol. 27, Issue S2, (2006)
- 作者机构：
  
  1. 中国科学院地质与地球物理研究所工程地质力学重点实验室,北京,100029
  2. 中国水电工程顾问集团昆明勘测设计研究院,昆明,650051
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：16 December 2006，
  
  Published：2006
- 稿件说明：
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YANG Ji-hong, QIN Si-qing, YANG Sheng-wei. Analysis on the effects of the confining pressure and pore pressure on the stress-strain curve of rock mass and the mechanism of the rainfall-induced Landslides[J]. 2006, 27(S2).
DOI：

YANG Ji-hong, QIN Si-qing, YANG Sheng-wei. Analysis on the effects of the confining pressure and pore pressure on the stress-strain curve of rock mass and the mechanism of the rainfall-induced Landslides[J]. 2006, 27(S2). DOI：

摘要

从宏观分析与微观机制方面探讨了围压、孔隙水压力对岩体应力应变曲线峰后特性即脆－延性转变的影响。定义了一个峰后破坏割线模量来表征孔隙水压力对岩体应力应变曲线转型的影响，并结合斜坡失稳的刚度判据，进一步分析了孔隙水压力对应力应变曲线峰后斜率的影响，随孔隙水压力的增加，峰后曲线斜率变陡，峰后刚度增大，即材料的均匀性、脆性增大与刚度比k减小。因此在围压等外界环境因素及系统内部条件不变时，刚度比时就存在一个临界孔隙水压力，也就是说降雨等涨落因素引起滑面介质中的孔隙水压力大于这个临界值时斜坡就易于发生突变失稳。从而进一步加深认识了降雨等外部涨落因素对斜坡系统失稳的重要触发作用。

Abstract

The effects of the confining pressure and pore pressure on the post-peak characteristics of the stress-strain curve of rock mass are analyzed in this paper. The apex post modulus is define to indicate the effect of the pore pressure transition of the stress-strain curves

the stiffness criterion of the landslide

the effect of the post-peak slope of the stress-strain curves is further analyzed. With the pore pressure increasing

the post-peak curve becomes steep

and the post-peak stiffness augments

that is

the homogeneity and brittleness of the material increases and the stiffness ratio k decreases. Therefore

under the same environmental and systematic conditions

there is a critical value for the stiffness ratio of 1. When the pore pressure surpasses the value

the landslide is inclined to be induced by rainfall. Rainfall is an important triggering factor of landslides.

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