国道219线桑桑-拉孜公路改建工程曲布桑大桥桥基砂土液化初步评价

曲布桑大桥工区位于青藏高原。该区地震活动频繁。桥下地基饱水的粉、细砂层较发育。文章根据《抗震设计规范》GB11-89的标准，通过标准贯入实验分析了曲布桑大桥在埋深15m内的地基具有发生砂土液化的可能性，并计算了液化指数，划分了液化等级。为防止砂土液化的发生，对桥下地基处理提出了建议。

Assessment of sand liquefaction about the foundation of Qubusang-Bridge in the rebuilding project of National Highway-219 route of Sangsang-Lazi

The research region of Qubusang-Bridge is located in the Qinghai-Tibet Plateau,where earthquakes are active frequently,and the ground developed with saturated silt and fine sand beds.According to the code for seismic design of buildings GB50011-89 in China,we analysis the possibility of sand liquefaction in the depth of 15?m in Qubusang-Bridge foundation on the basis of standard penetration hammer experiment results.We also give the index and level of sand liquefaction.In order to prevent sand liquefaction,the measures of controlling liquefaction have been suggested.