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通过对扁铲侧胀消散试验的机理进行分析,推导出扁铲侧胀消散试验中所测得的压力值与孔隙水压力之间的关系,进而提出根据扁铲侧胀消散试验资料绘制超孔隙水压力消散曲线的方法。采用计算机数值模拟的方法,得到扁铲探头贯入后,周围土体中超孔隙水压力在空间的分布规律,并将其作为求解固结微分方程的初始条件。通过对固结微分方程的求解,导出利用扁铲侧胀消散试验中超孔隙水压力随时间的变化及在空间的分布规律,提出用扁铲侧胀消散试验资料估算土体水平固结系数的方法。结合杭州地铁一号线工程勘察中二个工程所做的扁铲侧胀消散试验的实测数据资料,对本文的估算方法进行了验证。与室内土工试验的成果进行对比,结果令人满意。
Based on the analysis of the mechanism of the flattening dissipation test, the relationship between the measured pressure value and the pore water pressure in the flattening expansion test was deduced. Based on the data of the flattening dissipation test, Method of water pressure dissipation curve. Using computer numerical simulation, the spatial distribution of excess pore water pressure in the soil around the flat shovel probe is obtained and used as the initial condition for solving the differential equation. By solving the consolidation differential equation, the method of estimating the horizontal consolidation coefficient of soils by using the data of flat dilatometer dissipation dissipation is derived based on the variation of excess pore water pressure over time in the flat dilatometer dissipative test and its distribution in space . Combined with the measured data of two flattened shoal dissipation tests conducted by two projects in the project of Hangzhou Metro Line 1, the estimation method of this paper is verified. Compared with the results of indoor geotechnical test, the result is satisfactory.