论文部分内容阅读
孔隙水压力变化规律是饱和粉土体宏观变形细观结构研究的基础。以阳光新城工程为例,采用现场试验方法对长螺旋CFG桩施工时的孔隙水压力(简称孔压)变化进行了监测,并根据监测结果对施工过程的孔隙水压力(简称孔压)变化进行了阶段划分。研究结果,长螺旋CFG桩施工过程中孔压变化规律与常规的剪切液化观点相悖,抽吸与窜孔对孔隙水压力变化影响显著,并解释了产生这种现象的原因。孔压极大值和极小值在一定范围内产生累加效应,表现为非对称性,而变化的幅度值呈近似对称性。根据幅度值大小确定了长螺旋CFG桩施工时的影响范围,其值与小孔扩张理论比较吻合。
The variation law of pore water pressure is the basis of the study on the microstructure of macroscopic deformation of saturated silt. Taking the project of Sunshine Metro as an example, the change of pore water pressure (short hole pressure) during the construction of long helical CFG piles was monitored by on-site test. According to the monitoring results, the change of pore water pressure (referred to as pore pressure) The stage division. The results show that the variation of pore pressure during CFG pile construction contradicts the conventional shear liquefaction, and the influence of suction and collisions on pore water pressure is significant, and the reasons for this phenomenon are explained. The pore pressure maximum and minimum in a certain range of cumulative effects, the performance of asymmetry, and the magnitude of the change was approximately symmetrical. According to the magnitude of amplitude, the influence range of long spiral CFG pile is determined, which is in good agreement with the theory of hole expansion.