参数变化对流泥地层浅层加固沉降与固结的影响

针对流泥地层浅层加固的沉降和固结度特点,根据已有研究成果,推导得到压缩模量、渗透系数、固结系数、排水路径与固结应力的关系式,使沉降和固结分析可以考虑沉降和固结参数随固结应力的变化,利用涂抹效应考虑了土柱效应对固结的影响,并考虑了排水板弯曲对固结的影响。工程算例表明,流泥地层固结系数随有效固结压力增大而增大,土柱可以加快排水固结,应变固结度大于应力固结度。对于浅层加固,可以不考虑排水板弯曲、加固层厚度减少对固结的影响。

Influence of parameters change on settlement and consolidation of slurry stratum treated by shallow improvement

Equations between compression modulus,ostmotic coefficient,consolidation coefficient,seepage distance and effective consolidation stress are derived based on present results of research and considering characteristics of consolidation and settlement of shallow improvement of slurry stratum.Then change of consolidation and settlement parameters due to effective consolidation stress can be taken into account.The effect of soil column to consolidation is taken into account referring to the smear effect.The influence of bending drainage on consolidation is also analyzed.It is shown that the consolidation coefficient increases along with effective consolidation stress,the soil column is beneficial to consolidation,and the strain degree of consolidation is bigger than the stress degree of consolidation.The influence of bending drainage and decrease of thickness on consolidation can be neglected.