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针对目前对汶川8.0级地震产生的地震液化现象认识较少的情况,通过较详尽的现场调查以及收集相关地震、水文及地质资料,讨论汶川地震德阳市旌阳区地震液化分布及其特征问题。研究结果表明本次地震液化具有如下特点:(1)液化范围广,但分布不均匀,液化危害程度差距较大,液化的强弱受震动强度、水文及地质条件的影响;(2)地震液化的分布与区域水文地质条件、工程地质条件呈良好的对应关系;(3)地震液化与地裂缝有伴生性,且地裂缝与河流方向相近;(4)砂砾石层液化是本次地震液化的主要特征,是以往地震没有发现的现象。
Aiming at the current situation of little understanding of the earthquake liquefaction caused by the Wenchuan M 8.0 earthquake, the liquefaction distribution and its characteristics of the earthquake in Jingyang District, Deyang Municipality during the Wenchuan Earthquake are discussed through detailed field surveys and the collection of related seismic, hydrological and geological data. The results show that the liquefaction of this earthquake has the following characteristics: (1) The liquefaction range is wide but the distribution is not uniform, and the liquefaction risk is greatly different. The liquefaction strength is affected by the vibration intensity, hydrology and geological conditions; (2) (3) The liquefaction of earthquakes is associated with ground fissures, and the direction of ground fissures is similar to that of rivers; (4) The liquefaction of sand and gravel layers is the result of liquefaction of this earthquake The main feature is the phenomenon that was not found in previous earthquakes.