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Abstract According to weak regions of rigid pile composite foundation and piled embankments with bearing stratum penetration，the reinforcement of weak regions by using stretching net，rigid grid and additional pile of rigid gird-pile composite foundation was analyzed. The changing characteristics of force and deformation of rigid grid-pile composite foundation with and without bearing stratum penetration were investigated under different pile lengths；and the feasibility whether the rigid grid-pile composite foundation is applicable to the case without bearing stratum penetration was evaluated. The results show that，without bearing stratum penetration，the bending moment and shear force of most side piles are large，and their distribution regions would increase along the direction of embankment center when the pile length decreases. When the pile length increases，the load ratio of most piles increases，and the bending moment and shear force of side pile，embankment settlement and vertical deformation outside the embankment decrease. By increasing the pile length，applying PTC pile to enlarging the cross-section of central pile，and decreasing the additional pile?s diameter，the rigid grid-pile composite foundation can be optimized and be applicable to the case of bearing stratum penetration.
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Received: 13 December 2011
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2013, Vol. 32 
