真空联合堆载预压法负面效应分析

虽然真空联合堆载预压法具有许多优点，但是它也有一些负面效应。首先，由于真空卸除后地基土的不排水抗剪强度降低可能导致路基失稳，这种情况尤其可能出现在填土在很多时间内快速填筑完毕且真空马上卸除的时候。其次，由于真空卸除后地基土压缩模量降低可能导致工后沉降增大，特别是当真空卸除后马上施工路面的情况下容易出现上述情况。真空联合堆载预压法的其他负面效应如周围地面沉降和开裂在其他文献中已有报道。

Study of negative effects of method of preloading with vacuum and surcharge

Although the preloading method with vacuum and surcharge has many advantages, but it also has some negative effects. Firstly, it may lead to instability of embankment especially when fill is constructed in a short period and vacuum is unloaded immediately after finishing of surcharge because the undrained shear strength will decline with the unloading of vacuum. Secondly, it may lead to more settlement after construction especially when pavement is constructed immediately after unloading of vacuum for the value of compression modulus will decline with the unloading of vacuum. Other negative effects such as cracking and settlement of ground near the improvement zone have been reported in other papers already.