旋喷桩单桩施工引起的孔隙水压力数值模拟

为研究高压旋喷桩施工引起孔隙水压力的变化规律,以某滨海区域一工程现场试验为基础,建立数值分析模型,对高压旋喷桩施工进行模拟。结果表明:不同深度处的土体孔隙水压力沿径向基本呈对数衰减,孔隙水压力沿深度大体上呈递减趋势,局部出现拐点,有覆土情况下的有限元计算值更接近实测数据,深层有限元计算方法得出的孔隙水压力的消散过程与实测数据拟合较好,且随着深度减小误差增大,随着注浆压力的增大,孔隙水压力也增加。

Numerical simulation of pore water pressure caused by construction of single jet grouting pile

Based on the field experiments at a project in a coastal area,a numerical model was built to simulate the construction of high pressure jet grouting in order to investigate the variation laws of pore water pressure caused by the construction of high pressure jet grouting pile.The results show that the pore water pressure of the soil at different depths along the radial direction is basically logarithmic attenuation,the pore water pressure along the depth generally shows a decreasing trend while the turning point appears in the local area,the calculation of a finite element with covering is closer to the measured data,the dissipation of pore water pressure derived from the deep finite element calculation method fits well with the measured data,and with the depth decreasing error increase.The pore water pressure increases with the increase of grouting pressure.