联合支挡结构中抗滑桩设计参数分析与优化

Analysis and optimization of anti-slide pile design parameter in combined retaining structure

提出了联合支挡结构支挡结构的稳定系数计算公式,并依托实际工程建立数值模型.通过与桩基托梁挡土墙和桩板墙进行对比,验证了联合支挡结构支挡高填方路基的优越性.分析了桩间距、桩身截面尺寸和锚固长度对抗滑桩弯矩和水平位移的影响,结果表明:抗滑桩的截面尺寸对桩身弯矩、位移和结构的稳定性均有较大影响;桩间距变化对桩身弯矩的影响较小,但对结构的稳定性影响较大;实际工程中应尽量减小平台与基岩交界面之间的顺坡倾角,并将挡土墙水平位移控制在适当的范围内.

The calculation method of stability coefficients of the combined retaining structure(CRS)was proposed,and the numerical model was built based on practicalproject of CRS.Compared with other two types of retaining structure,the advantages of the CRS were explicated.Meanwhile,the spacing of anti-slide pile,the sectional dimension of anti-slide pile and the anchorage length of anti-slide pile were changed to study the bending moment and horizontal displacement of the anti-slide piles under different conditions.Research results show that the size of sectional dimension of anti-slide pile has significant impacts on the bending moment and displacement of anti-slide pile,as well as the stability of the CRS.The pile spacing has less effect on the bending moment of anti-slide pile,but has more effect on the stability of the CRS.In engineering practice,inclination of the interface between the platform and bedrock should be reduced as much as possible,and the horizontal displacement of gravity retaining wall should be controlled within a certain range.