论文部分内容阅读
为了更好地掌握CFG桩复合地基的桩身应力特性,借助大型有限元ANSYS软件,考虑复合地基中各种材料的非线性特性,对CFG桩桩身应力特性进行了数值模拟分析。在荷载作用下,桩身应力最大值分布在桩长深度比值z/L为0.2～0.4处,随着荷载的增大,最大值的位置逐渐上移,同时曲线由平缓变陡峭,最大值增加的幅度加大。桩身应力随褥垫层厚度增大而减小,随着褥垫层模量增加而相应增加,随桩间土模量的减小而增加。随着桩长的增加,桩体的应力增加,但增加的幅度逐渐减小。在荷载一定的情况下,CFG桩存在临界桩长。
In order to better understand the stress behavior of the pile body of the CFG pile composite foundation, the stress characteristics of the CFG pile body are numerically simulated with the help of the large-scale finite element ANSYS software and considering the nonlinear characteristics of various materials in the composite foundation. Under the action of load, the maximum stress of pile is distributed at depth ratio z / L of 0.2-0.4. With the increase of load, the position of maximum value moves up gradually, meanwhile the curve changes steep and gentle, the maximum value increases Increase in the rate. The pile body stress decreases with the increase of the thickness of the cushion, and increases with the increase of the cushion cushion modulus, which increases with the decrease of the soil modulus between the piles. With the increase of pile length, the stress of pile increases, but the increasing amplitude decreases gradually. In the case of a certain load, there is a critical length of CFG pile.