建设发生土作为压密固结桩填充材料的渗透性

Analysis of construction generated soil as filling material for consolidation pile

为了采用建设发生土部分替换优质砂作为密实桩的填充材料,进行了室内土试样的调制,制备了不同塑性指数的黏土试样,进行了压密不排水三轴压缩试验和渗透性试验,研究其强度特性和渗透性能.在塑性指数小于30的情况下,能够满足内摩擦角大于30°的要求.松散状态下能够确保渗透系数在10-4cm/s以上,但密实状态下的渗透系数却很小,为了保证砂桩能有效的排水,必须要采取提高渗透性的其他辅助方法.

This paper introduced the construction generated soil which partially replaces the high grade sand as the filling material for dense piles. Experiments were carried out on modulations of the indoor soil sample and preparations of the plasticity index of clay samples. Moreover, the undrained triaxial compression tests and permeability tests were completed in order to study the strength characteristics and performance of permeability. The required greater than 30 internal friction angle can be achieved when the plasticity index number is less than 30°. The permeability coefficient was guaranteed to be greater than 10-4cm/s in loose state, but it was very low in dense state. Therefore, other methods of improving permeability need to be adopted to ensure the effective drainage of the sand piles.