饱和粘土中平均塑性体积应变对压密注浆的影响

Effects of average plastic volumetric strain on compaction grouting in saturated clay

针对工程上通常不考虑平均塑性体积应变Δ的影响或者简单取Δ为 0 .0 1的情况 ,分析了饱和粘土中平均塑性体积应变对压密注浆的影响范围、极限孔压、超孔隙水压力的影响并给出考虑其影响的计算公式。研究表明 :在工程中平均塑性体积应变的影响通常是应该考虑的 ,它是反映土体变形规律的重要参数 ,并提出了平均塑性体积应变的简化确定方法 ,操作简单 ,判断快捷 ,适合工程应用。当G/Cu≤ 4 0时 ,可以不考虑平均塑性体积应变的影响。

Aiming at the situation of neglecting the effect of average plastic volumetric strain or giving it the value 0.01 in engineering, the author analyzed its effects on the effect scope, displacement in plastic zone, ultimate pressure, excess pore water pressure in compaction grouting in saturated clay and presented the corresponding formulas. It is shown that the effect of average plastic volumetric strain should be considered generally in engineering. It's an important parameter reflecting the deformation law of soil. The average plastic volumetric strain can be obtained by the inversion with the heave height on the surface. In general, when G/C u is less than 40, its effect can be neglected.