Analysis on the Causes of Geological Disasters and Building Damage Characteristics of Debris Flow Induced by Earthquake in Jishishan,Gansu Province on December 18
Analysis on the Causes of Geological Disasters and Building Damage Characteristics of Debris Flow Induced by Earthquake in Jishishan,Gansu Province on December 18
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
Key words
Ms6.2 earthquake in Jishishan/debris flow disaster/soil liquefaction/impact force of debris flow/shear strength of masonry structure
维普
万方数据