复合地基沉降计算中复合模量的探讨  

Discussion on Composite Modulus in Settlement Calculation Of Composite Foundation

作　　者：刘银利[1] 史斌[1] 张静[1] 

机构地区：[1]西安建筑科技大学建筑设计研究院,西安710055

出　　处：《路基工程》2013年第4期89-93,共5页Subgrade Engineering

摘　　要：复合模量作为复合地基沉降计算的一个重要参数指标被广泛运用,其值采用桩和桩间土压缩模量的加权平均法来计算。通过复合地基单桩的三维有限元模拟结果、相关理论以及工程实例,指明了加权平均法的不合理之处;并对复合模量的正确应用问题进行了探讨:利用复合模量提高系数计算复合模量或者采用平板载荷试验的变形模量代替复合地基的复合模量,这两种方法与实际结果具有较高的相符度,并且简便易行。Composite modulus, as an important parameter for settlement calculation of composite foundation, is widely used and its value is calculated by the method of weighted average of compression moduli of pile and soil between piles. However, the irrationality of this method, through three-dimensional finite element simulation of single pile of the composite foundation, related theories and engineering example, was proved. Simultaneously, the proper application of composite modulus was discussed to the extent that it may be calculated by using a improvement factor of composite modulus or be replaced with the deformation modulus of plate loading test. The both methods have the results highly consistent with the actual value, and are simple and easy to be conducted.

关 键 词：复合地基 沉降计算 复合模量 有限元 桩土应力比 

分 类 号：TU473.1[建筑科学—结构工程]