超大堆载下桩网复合地基变形特性离心模型试验研究

Centrifugal model tests on deformation characteristics of pile-net composite foundation under super-large loads

CFG桩网复合地基广泛应用于处理软土地基。采用土工离心模型试验研究某码头堆场超大荷载下CFG桩网复合地基的变形特性,试验模拟了地基、CFG桩、树根桩、加筋垫层、防尘网和轨道梁基础、矿石堆载等,分析了超大荷载作用下复合地基沉降、防尘网和轨道梁基础水平位移、地基剖面位移的变化规律。试验结果表明,复合地基的沉降速率在稳定控制标准之内,沉降量满足堆场使用要求,防尘网基础和轨道梁基础水平位移和沉降均很小,复合地基沉降分量远大于水平位移分量。CFG桩网复合地基在350 kPa荷载作用下是稳定安全的,达到了预期加固效果。

The CFG pile-net composite foundation is widely used to reinforce soft soil foundation.The geotechnical centrifugal model tests are carried out to study the deformation characteristics of the CFG pile-net composite foundation under super to large loads in the storage yard of a wharf.The foundation,CFG piles,root piles,reinforced cushion,dust net foundation,track beam foundation and ore loads are simulated in the tests.The variation laws of surface settlement,horizontal displacement of track beam foundation and displacement of foundation profile of the composite foundation are analyzed under super-large loads.The settlement rate of the composite foundation is within the stability control standard,and the settlement meets the requirements of the storage yard.The horizontal displacement and settlement of the dust net foundation and the track beam foundation are small.The settlement component of composite foundation is much larger than the horizontal displacement one.The test results show that the CFG pile-net composite foundation is stable and safe under the load of 350 kPa,and the foundation reinforcement has achieved the expected effects.