承压水层降水引起的成层软土一维固结解析解

Analytical Solution of One-Dimensional Consolidation for Layered Clays Induced by Water Level Decline in Confined Water

在饱和成层软土的计算模型下,推导了承压水层水位下降引起的一维固结解析解。通过退化解答与已有的单层软土固结解析解进行对比,验证了该解答正确性。对三层软土的算例进行计算分析,讨论了不同水位下降速率、层间渗透性和层间压缩性差异对成层软土中超静孔压、分层沉降和地表沉降的影响,同时与已有的加载条件下的解析解作了对比分析。分析结果表明:水位下降速率主要影响前期固结过程;相对低渗透性的弱透水层在成层软土中的位置会影响不同阶段的固结沉降速率;相对高压缩性土层在成层软土中的位置会影响最终地表总沉降大小。

With the calculation model of saturated layered clays,the one-dimensional consolidation analytical solution with the lowering of confined aquifer water level was derived.The correctness of the solution was verified by comparing the degradation solution with the existing solution of single-layer soft soils. The calculation and analysis of the three-layer soft soils were carried out.The effects of different water level decline rates,interlayer permeability and compressibility difference on excess pore water pressure,stratified and ground settlement were discussed. Meanwhile,the solutions were compared with the existing analytical solutions under loading conditions.The analysis results show that water level decline rate mainly affects the prophase process of consolidation.The position of the low permeability aquifer in the layered soft clays will influence the consolidation rate at different stages.The position of the high compressibility soils in the layered soft soils will influence the final ground settlement.