Simple talking about the construction technology of weak expansive soil embankment;

The chemical improvement experimental analysis and research of weak expansive soil as roadbed filler;

The compaction tests, CBR tests and swell capacity tests of 50 kPa pressure for the weak expansive soil were carried out under the different compactive effort and water content.

Practice of lime-soil compaction pile in soft soil foundation stabilization;

Engineering application of vibro-replacement stone column for saturated soft soil foundation treatment;

The characteristics and working behaviours of soft soil,the treatment of soft subgrade are discussed in this paper.

The application of the combined pile and anchor retainingstructure for deep excavation engineering in soft soil;

Based upon analysis of overturning failure of composite soil nailing wall retaining system of foundation pit of one office in Suzhou one conclusion is obtained that foundation pit is subject to instable when soil mass work encounter soft soil layer and with high water content utilizing composite soil nailing wall for foundation pit support.

The technical process of tamping macadam compaction pier is as follows: firstly form pores artificially,then replace the soft soil with the scree and tamp to close-grained scree pier by layered power.

Taking soft foundation treatment in Wengang Road widening reconstruction engineering in development zone of Yancheng as an example,the author introduces the construction technological process of strengthening soft soil layer with wasted granular materials and the control essentials of each working procedure,and points out construction notices,in order to achieve well strengthening result.

Through the illustration of actual engineering practices, it points out that the subsidence characteristics caused by the soft soil layer under the roadbed is closely related to the buried depth.

The main target of this thesis is as follows:1、Study the influence of the soft soil layer to peak acceleration of earthquake, mainly study the thickness and depth of the soft soil layer to analysis the amplification effect or reduction effect of peak acceleration of earthquake.