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因孔内压力瞬间加载到指定状态,球(柱)孔塑性区土体受力特征符合不固结不排水状态.基于此得出了针对饱和黏性土体中球(柱)孔扩张问题的屈服准则,此准则与Tresca准则形式相同.通过该屈服准则得出了饱和土体中球(柱)孔扩张问题的总应力场.然后通过弹性区、塑性区和弹塑性界面的特征求解出弹性区和塑性区超孔隙水压力;再根据有效应力原理,得出球(柱)孔扩张问题的有效应力场.最后利用推导出的理论成果,对沉桩引起的超孔隙水压力的实测值与计算值进行了比较分析.
Due to the instantaneous loading of the pressure in the hole to the specified state, the mechanical characteristics of the soil in the plastic zone of the ball (column) bore are in accordance with the unconsolidated and undrained state. Based on this, Yield criterion, which is the same as the Tresca criterion. The total stress field of the sphere-hole expansion problem in saturated soils is obtained by the yield criterion. Then, the elastic properties, the plastic region and the elasto-plastic interface are used to solve the elastic properties And pore water pressure in the plastic zone, and then according to the principle of effective stress, we can get the effective stress field of the sphere (column) hole expansion problem.At last, using the deduced theoretical results, the measured value of excess pore water pressure caused by pile driving is compared with The calculated values were analyzed comparatively.