深厚覆盖层上水电站厂房地震动位移计算和控制

Seismic Displacement Calculation and Control of Hydropower Powerhouse on Deep Overburden

针对修建在深覆盖层软土地基上水电站厂房的地震响应问题,采用有限元法对西藏某水电站厂房进行模拟和计算。采用阵型反应谱分析法对厂房进行抗震分析,用面-面接触单位模拟桩与土体的摩擦接触问题,地基的变形模量采用卸载再加载模量。对不同地基处理措施下计算结果的对比分析表明,在整个厂房底部设置摩擦桩并进行较大范围的固结灌浆,可以控制一部分的厂房地震动位移。

For solving the seismic response problem of hydropower powerhouse on deep overburden, the FEM is applied to simulate and analyze the seismic response of a hydropower station in TibeL The spectrum analysis is also applied to analyze the anti-seismic characteristic of powerhouse. The surface-to-surface contact model is used to simulate frictional contact between piles and soil and the unloading and reloading modulus is used as deformation modulus of foundation. Through comparing the calculation results of different foundation treatment measures, a conclusion can be drew that setting up friction piles in whole bottom of powerhouse and making a wide range of consolidation grouting can control part of seismic displacement.