区域应力场与岩质滑坡的关系:以2022年泸定M_(s)6.8级地震区为例  

The Relationship between Regional Stress Field and Rock Landslide: A Case Study of the 2022 Luding M_(s)6.8 Earthquake

作　　者：孔维林 伍纯昊 崔鹏 张亦凡[2,4] 李渝生 Kong Weilin;Wu Chunhao;Cui Peng;Zhang Yifan;Li Yusheng(Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;Key Laboratory of Mountain Hazards and Surface Process/Institute of Mountain Hazards and Environment,Chinese Academy of Sciences(CAS),Chengdu 610041,China;China-Pakistan Joint Research Center on Earth Sciences,CAS-HEC,Islamabad 45320,Pakistan;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院地理科学与资源研究所陆地表层格局与模拟中国科学院重点实验室,北京100101 [2]中国科学院、水利部成都山地灾害与环境研究所,中国科学院山地灾害与地表过程重点实验室,四川成都610041 [3]中国‒巴基斯坦地球科学研究中心,中国科学院‒巴基斯坦高等教育委员会,巴基斯坦伊斯兰堡453204 [4]中国科学院大学,北京100049

出　　处：《地球科学》2025年第1期299-310,共12页Earth Science

基　　金：国家自然科学基金青年科学基金项目(No.42201096);第二次青藏高原科学考察研究(No.2019QZKK0906)。

摘　　要：地球表面和内部发生的各种构造现象及其伴生的地质灾害都与区域应力场密切相关.然而,区域应力场与滑坡密度或规模的定量化关系认识尚不明确.基于考虑断层和地形影响的高分辨率三维应力场模型,结合岩体结构损伤数据,分析了2022年9月5日泸定M_(s)6.8级地震前后发生的岩质滑坡规模和面密度与不同应力参数的关系.结果表明,最大剪应力与岩质滑坡的面积上限和面密度之间存在显著正相关关系,最大剪应力高值区与地震前后岩质滑坡的空间分布高度吻合,90%以上的岩质滑坡所在区域的最大剪应力最小值为6.95MPa.受地形与断层扰动的应力场控制了岩体结构面的发育,为岩质滑坡的形成创造了必要的物质条件.本研究强调了岩质滑坡的发生不仅仅是由随机因素触发的简单过程,而是一个受地应力、地形和地质结构影响的复杂过程.Various tectonic phenomena occurring on and beneath the Earth's surface,and the associated geological disasters,are closely related to regional stress fields.However,the quantitative relationship between regional stress fields and landslide density or size is not yet clear.This paper utilizes a high-resolution three-dimensional stress field model that accounts for fault and topographic influences,combined with rock damage data,to analyze the relationship between the size and density of rock landslides and different stress parameters before and after the Luding M_(s)6.8 earthquake on September 5,2022.The results indicate that stress field shows a strong correlation with rock landslides.A significant positive correlation exists between the maximum shear stress and both the upper area limit and density of rock landslides.Areas of high maximum shear stress align closely with the spatial distribution of rock landslides before and after the earthquake,with over 90%of the landslides occurring above a threshold of 6.95 MPa in maximum shear stress.The stress fields,disturbed by topography and faults,control the development of structural planes in the rock,creating the necessary material conditions for the formation of rock landslides.This study emphasizes that the occurrence of rock landslides is not merely a simple process triggered by random factors,but a complex process influenced by ground stress,topography,and geological structures.

关 键 词：应力场 最大剪应力 断层 岩质滑坡 岩体损伤 灾害地质 

分 类 号：P642.23[天文地球—工程地质学]