抛石挤淤成堤断面形态研究

Study on the Shape of the Dike Constructed by Squeezing Soft Clay Method

采用极限平衡分析法和有限元数值模拟方法研究抛石挤淤成堤的厚度和断面形态。研究表明,抛石挤淤的深度与淤泥的性质、抛石的容重等有关,淤泥性质越差、抛石容重越大,越有利于抛石挤淤;当各种参数已知时,可根据抛石露出原始淤泥面的高度推测出抛石挤入淤泥中的深度;抛石挤淤成堤的断面形态为淤泥面上的正梯形和淤泥面下的近似倒梯形的组合。深圳湾滨海某抛石挤淤填筑海堤厚度和断面形态的极限平衡分析和有限元数值模拟结果与实际探地雷达的检测结果非常相似,证实了理论分析的正确性以及探地雷达检测结果的可靠性。

The relations among different depths and the shape of the dike constructed by squeezing soft clay method were studied with limit balance analysis method and finite element simulation method respectively. Results indicate that the depth of dike depends on the properties of the soft clay and the density of the stone. It is easier to squeeze the soft clay if the properties of the soft clay become bad and the density of the stone becomes higher. When all parameters are known, the depth of the dike under the soft clay can be estimated from the depth of the dike above the soft clay. A conclusion is drawn that the shape of the dike is composed of a trapezoid above the soft clay and a similar inverse trapezoid under the soft clay. The re- suits obtained by limit balance analysis and finite element simulation for the depths and the shape of a cer- tain dike constructed by squeezing soft clay method in Shenzhen Bay are quite similar to the results got by Ground Penetrating Radar （GPR） inspection, which validates the correctness of the theoretical analysis and the reliability of GPR inspection results.