Bearing Capacity of Mixed Pile with Stiffness Core

To study load transfer mechanism and bearing capacity of a mixed pile with stiffness core （MPSC）, which is formed by inserting a precast reinforced concrete pile （PRCP）, in-situ tests involving MPSCs with different lengths, diameters, water cement ratios and PRCPs, cement mixed piles, and drilling hole piles, were carried out. Limit bearing capacities, load-settlement curves and stress distribution of MPSCs and mixed piles were obtained. The load transfer between cement soil and PRCP was analyzed by finite element method （FEM）. Test results and FEM analysis show that an MPSC has fully utilized the big friction from a cement mixed pile and the high compressive strength from a PRCP which transfers outer top load into the inner cement soil, and that inserting a PRCP into a mixed pile changes the stress distribution of a mixed pile and improves frictional resistance between a mixed pile and soil. The length and the section area on PRCP of an MPSC both have an optimum value. Adopting MPSC is effective in improving the bearing capacity of soft soil ground.

为了与僵硬学习负担转移机制和混合堆积的适用的能力，核心( MPSC )被插入预制增强的具体堆积( PRCP )形成，在原处测试与不同长度，直径，水水泥比率和 PRCP 包含 MPSC ，水泥混合了堆积，并且钻洞堆积，被执行。限制适用的能力，负担解决曲线和 MPSC 的压力分发，混合堆积被获得。在水泥土壤和 PRCP 之间的负担转移被有限元素方法分析(女性) 。测试结果和女性的分析证明 MPSC 充分从从外部顶装进转移内部水泥的 PRCP 的混合堆积和高压缩强度玷污的水泥利用了大磨擦，并且那插入进混合堆积的 PRCP 改变混合堆积的压力分发并且改进在混合堆积和土壤之间的摩擦抵抗。长度和 MPSC 的节区域 onPRCP 两个都有最佳价值。采用 MPSC 在改进软土壤地面的适用的能力是有效的。