Based on the result of load test,the data of test in silty clay foundation contained gravel is analyzed.

This paper describes the strengthening technique by grouting and concrete construction process for deep burying karst cave with filling silty clay of Yuanliang Mountain Tunnel on Chongqing-Huaihua,The frequency of crossgrout occurring in tunnel construction can be reduced and the strengthening feeect by grouting can be ensured by adapting this technique.

The paper introduces the grouting technique used for small deep-buried Kast cave filled with silty clay at section PDK366+035～+015 of Qiyueshan Tunnel on Yiwan Railway which featured by high pressure and enriched water.

Study on parameters of Duncan-Chang model for Handan silty clay;

Experimental study on instability of rigid piles under lateral loads in silty clay;

Probabilistic characteristics of strength indexes for Taiyuan silty clay;

Study on clayey silt under loading and unloading condition by test;

By the difference analysis of the field and laboratory seepage testing results of the clayey silt , the cause of the difference of the two kinds of testing result has been found.

The article introduces a dewatering example of foundation pit project, and analyzes the influence of the subsurface water in the shallow clayey silt stratum of Shanghai area on the construction of foundation pit.

Based on the analysis for the hydrogeological and engineering geological conditions of the Gushan open stope, the possibility of building anti-seepage stepped curtain in silty clay layer between silt-sand aquifer and sand-gravel aquifer is discussed.

The experiment was performed for four membrane holes of different diameters and for a vertical one using the heavy silt clay in the laboratory.