防灾减灾工程学报2024，Vol.44Issue(2)：322-332,11.DOI:10.13409/j.cnki.jdpme.20230529005
全风化花岗岩滑坡稳定性与降雨关系分析
Analysis of the Relationship Between Stability of Fully Weathered Granite Landslides and Rainfall
摘要
Abstract
Rainfall is the primary trigger for landslides.With China's disaster prevention efforts chang-ing from post-disaster relief to pre-disaster prevention,and from disaster loss reduction to disaster risk mitigation,it is crucial to understand the triggering mechanisms for rainfall-induced disasters and es-tablish effective early warning systems for geological disaster prevention and mitigation.To address the stability issues of rainfall-induced landslides in fully weathered granites,shear tests on in-situ soils with different moisture contents and large-scale physical similarity model tests were carried out in Qin-gdao's Lao Mountain area as an example.The slope's response to rainfall was revealed,the relation-ship between the stability of fully weathered granite landslides and rainfall was explored,and relevant quantitative formulas were fitted.Additionally,ABAQUS was used to establish a three-dimensional flow-solid coupled numerical model for the slope,validating the equations through the strength reduc-tion method.The research results showed that:(1)Rainfall-induced fully weathered granite landslides failure progressed through four stages:infiltration and erosion → surface deformation → damage deep-ening → overall instability.The slope exhibited the phenomena of"drum-like bulge"and"sheet-like slipping"during the deformation period,and ended up with a translational slipping.(2)The slope's re-sponse to rainfall infiltration showed spatial variability,with greater rainfall intensity leading to faster increases in moisture content and pore pressure.(3)Based on the experimental results,formulas de-scribing the relationship between landslide moisture content,safety factors,and rainfall intensity and duration were derived.Numerical simulation confirmed the accuracy of these formulas with minor devi-ation,accurately describing the quantitative relationship between landslide stability and rainfall.The results of the study provide insights on early warning and prevention strategies for landslides in areas with similar strongly to fully weathered granite.关键词
全风化花岗岩/降雨诱发滑坡/物理模型试验/数值模拟/定量研究Key words
fully weathered granite/rainfall-induced landslides/physical model tests/numerical simula-tion/quantitative studies分类
天文与地球科学引用本文复制引用
刘红军,武闻禹,耿林,刘良,张国良,孙文雨,于鹏..全风化花岗岩滑坡稳定性与降雨关系分析[J].防灾减灾工程学报,2024,44(2):322-332,11.基金项目
自然资源部滨海城市地下空间地质安全重点实验室开放基金(BHKF2021Z11)项目、青岛地质工程勘察院科研基金项目(2022-QDDZYKY06)资助 （BHKF2021Z11）
