扁铲侧胀消散试验求解固结系数的研究  

Study on Solution to Consolidation Coefficient by Flat Dilatometer Dissipation Tests

作　　者：唐世栋[1] 陶利勇[1] 肖勇[1] 

机构地区：[1]同济大学地下建筑与工程系,上海市200092

出　　处：《勘察科学技术》2011年第3期1-5,共5页Site Investigation Science and Technology

摘　　要：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。With the analysis of flat dilatometer dissipation test＇s mechanism,the relationship between pore water pressure and earth pressure is deduced,and the method of drawing excess pore water pressure＇s dissipation curve according to the flat dilatometer dissipation test＇s data is proposed.By means of numerical simulation methods,the excess pore water pressure distribution rule in space after flat shovel probe＇s penetration is obtained,and it can be taken as the initial conditions of solving consolidation differential equation.Through the solution of consolidation differential equation,the pore water pressure distribution rule with the change of time and space by flat dilatometer dissipation test is deduced,and the method of estimating consolidation coefficient by flat dilatometer dissipation test＇s data is proposed.The estimation method in the paper is verified with flat dilatometer dissipation test＇s data done in two construction sites＇engineering survey in Hangzhou subway line No.1 by comparison of estimated values in site and indoor test values,the results are satisfactory.

关 键 词：固结系数 扁铲侧胀消散试验 固结微分方程 

分 类 号：TU411[建筑科学—岩土工程]