12·18甘肃积石山地震诱发泥石流地质灾害成因及建筑物破坏特征分析  

Analysis on the Causes of Geological Disasters and Building Damage Characteristics of Debris Flow Induced by Earthquake in Jishishan,Gansu Province on December 18

作　　者：孙杲辰 陈涛[1] 代建波[1] 朱熹育[1] 兰官奇 刘玉屏 李龙[1] 霍俞帆 SUN Gaochen;CHEN Tao;DAI Jianbo;ZHU Xiyu;LAN Guanqi;LIU Yuping;LI Long;HUO Yufan(School of Civil Engineering,Xi′an Shiyou University,Xi′an,Shaanxi 710065,China;China State Construction Engineering Corporation Aecom Consultant Co.,Ltd.,Lanzhou,Gansu 730030,China)

机构地区：[1]西安石油大学土木工程学院,陕西西安710065 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730030

出　　处：《水利与建筑工程学报》2024年第4期134-139,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金青年基金(42301156);国家自然科学基金青年基金(52308204);陕西省自然科学基金青年基金(2023-JC-QN-0626);陕西省岩土与地下空间终点实验室开放基金(YT202302)。

摘　　要：2023年12月18日甘肃省临夏州积石山县发生了Ms6.2级地震,地震诱发临近的青海省草滩村至金田村一带泥石流地质灾害,造成了巨大的人员伤亡。通过震后现场调研、物源提取、现状台塬稳定性分析以及泥石流冲击力与砌体结构的相互作用分析,并探讨泥石流成因、类别及泥流与建筑物相互作用机理。结果表明:灾害成因为该区域台塬冬灌后标准冻深内土体震后液化导致台塬滑塌引起,液化后土体呈泥流状随现状沟道运移至沟口,并迅速扩散与建筑物发生强烈的冲击作用,泥石流的作用方向与建筑物受力面夹角为90°,深度达到2.8 m、冲击力达到6.4 kPa时,建筑物即发生剪切破坏而倒塌。On December 18,2023,a Ms6.2 earthquake occurred in Jishishan County,Linxia City,Gansu Province.The earthquake induced mudslide geological disaster in Caotan—Jintian Village,Qinghai Province,resulting in huge casualties.The causes and types of debris flow and the interaction mechanism between mud flow and buildings are dis-cussed through the field investigation,source extraction,the current stability of the platform,the impact force of mud flow and the strength of masonry structure.The results are as follows.The disaster was caused by the collapse of the platform after the liquefaction of the soil in the standard freezing depth of the platform after winter irrigation in this re-gion.After liquefaction,the soil moved to the mouth of the gully in the form of mudflow along with the current chan-nel,and then rapidly spread out to interact strongly with the building.When the Angle between the action direction of the debris flow and the bearing surface of the building is 90°,the depth reaches 2.8 m,and the impact force reaches 6.4 kPa,the impact force of the debris flow will reach 90°.The building collapsed due to shear failure.

关 键 词：积石山Ms6.2级地震 泥石流灾害 土体液化 泥石流冲击力 砌体结构抗剪强度 

分 类 号：TU43[建筑科学—岩土工程]