摘要
根据路基荷载面积较大、布桩均匀的特点,利用介质力学对称面剪应力为零的原理,简化刚性桩复合路基计算模型。通过零摩阻区上下段桩间土压缩量分别与桩头及桩端刺入量的相等关系,桩头与垫层、桩端与持力层的约束关系,可以求解零摩阻区(或中性点)及桩头桩端的桩土相对位移,进而计算路基沉降、桩侧摩阻及桩体轴力分布。在路基稳定验算中,把滑动单元荷载扣掉滑面处桩体轴力,并按弹性地基梁法确定桩体水平抗力以符合其弯断破坏形式。
Based on the features of large load area and even pile distribution,the calculating model of rigid pile composite subgrade is simplified by the continuum mechanics principle about zero shear stress in symmetric plane. Through the equality relations between compressive deformation of soil between upper pile and lower pile in the zero frictional resistance area and penetration pile top and pile end and the constraint relations between pile top and bedding and between pile end and bearing layer,the pile- soil relative displacements in the zero frictional resistance area（ or neutral point）and on the pile top and at the top end may be worked out and then the subgrade settlement,the pile frictional resistance and the axial force distribution of pile body can be worked out. in the stability checking of the subgrade,the axial force of pile body at the sliding surface shall be deducted from the load of sliding unit,and horizontal resistance of pile body shall be determined according to elastic foundation beam method to meet the curved breaking mode.
出处
《高速铁路技术》
2014年第4期1-6,共6页
High Speed Railway Technology
关键词
路基
刚性桩
设计
稳定验算
沉降
subgrade
rigid pile
design
stability checking
settlement
