汶川地震中甘肃清水田川黄土液化的试验研究

2008年5·12特大地震中，位于甘肃省清水县郭川乡的田川村发生了饱和黄土的液化滑移灾害。本文首先在对田川场地进行考察的基础上，综合田川在汶川地震中的震害情况以及滑移区的地形条件，将该地区在汶川地震中的烈度进行了修正。其次对田川黄土进行了物性指标测试以及室内动三轴液化试验，根据试验结果，综合考虑产生液化所需的场地及土性条件、黄土的动强度和液化特性，对田川黄土液化灾害进行了分析，并采用反应分析的方法对其进行了液化判定。研究结果证明了田川黄土液化的事实存在性，为低烈度区黄土液化提供了新的震害依据。

A study of loess liquefaction induced by the Wenchuan Ms8.0 Earthquake in Tianchuan, Qingshui County, Gansu Province

In the Wenchuan Ms8.0 Earthquake,the landslide damage due to liquefaction of saturated loess occurred in the Tianchuan,Qingshui County,Gansu Province.In this paper,based on the field and hazard investigation of the site,we amended the seismic intensity of the region in the Wenchuan earthquake by considering the geographic and geomorphic conditions and the seismic damage of structures of the village.Moreover,the tests on the physical property index and dynamic triaxial liquefaction of Tianchuan loess were carried out based on test results,the liquefaction of Tianchuan saturated loess was analyzed by considering the site conditions and soil characteristics,dynamic strength and liquefaction characteristics of the loess.Finally,the liquefaction discrimination of the loess was completed by using the response analysis method based on the result of dynamic triaxial liquefaction tests.The results show that the liquefaction of the loess is typical example of loess liquefaction,which provides a new example of loess liquefaction in low seismic intensity region.