汶川大地震中德阳地区液化特点分析

汶川大地震中八个主要地区均有液化现象出现,其中德阳地区液化现象及其震害最为显著.通过现场调查和工程地质资料分析,德阳地区的液化特点为:液化带主要集中在绵竹市、什邡市和德阳市,绵竹市最为严重;液化在烈度Ⅶ、Ⅷ、Ⅸ度区均有出现,但Ⅷ度区最为集中;液化喷水高度多在几公分到2m之间,最高一处超过10 m;液化场地喷出物基本涵盖...

Liquefaction characteristic analysis in Deyang region in the Wenchuan earthquake

In Wenchuan earthquake,liquefaction phenomena occurred in eight major regions,in which liquefaction and relevant damage in Deyang region were the most significant.Through field investigation and engineering geological data analysis,liquefaction characteristics in Deyang region are:(1) Liquefaction zones(belts) were mainly located in Mianzhu,Shifang and Deyang cities,and the most serious was in Mianzhu;(2) Liquefaction was observed in the regions of intensities Ⅶ,Ⅷ,Ⅸ,but mainly concentrated in intensity Ⅷ;(3) Heights of liquefaction water-jet were centimeters to meters,and the highest was more than 10m;(4) The ejected materials in liquefied sites basically covered all soil types,nearly 50% of fine sand followed by 16% of gravel;(5) 80% of the liquefaction zones were associated with cracks which caused houses tilting,sinking,cracking and even collapse even though the houses were built with ring beams and structural columns;(6) The strata contain thick gravel and cobble layers,and thin sand layers contain gravel.Therefore the actual liquefaction is gravel soil.