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以西藏某水电站工程为例,针对深覆盖层软土地基上水电站厂房的沉降变形问题进行了有限元模拟和计算,利用邓肯—张双曲线模型中的卸载再加载模量代替原始地基变形模量与摩尔—库仑等面积圆屈服准则的组合作为地基本构模型进行计算,并采用面—面接触单位模拟桩与土体的摩擦接触,通过对不同施工措施下的结果比较和分析,提出了在整个厂房底部设置摩擦桩并进行较大范围的固结灌浆,可控制部分厂房沉降和蓄水引起的回弹变形。
Taking a hydropower project in Tibet as an example, the finite element method (FEM) was used to simulate the settlement and deformation of hydropower station on deep overburden soft soil foundation. The unloading and reloading modulus in Duncan - Chang hyperbola model was used to replace the original deformation modulus And the molar-Coulomb constant yielding criterion are used as the basic structural model, and the friction contact between the pile and the soil is modeled by the face-plane contact unit. By comparing and analyzing the results under different construction measures, Friction piles are arranged at the bottom of the whole plant and a large range of consolidation grouting is performed, which can control the springback deformation caused by settlement and water storage of some factories.