贵州地区水平受荷嵌岩群桩内力与变形特性分析

Analysis of internal force and deformation behavior about laterally loaded pile group embedded in rock in Guizhou

水平荷载作用下嵌岩群桩的受力主要受桩间距、嵌岩深度、桩径、土层厚度的影响,借助数值模拟来探究这些因素对基桩内力、变形的作用。基于ANSYS,介绍土岩本构模型及力学参数,对水平受荷群桩进行数值模拟,采用正交试验来研究各因素对基桩变位的影响。结果表明:存在临界桩间距,在该临界桩间距内峰值弯矩、桩底剪力与桩间距正相关;桩底弯矩、剪力随嵌岩深度增大而增大;基桩弯矩、剪力绝对值随桩径增大而增大;基桩弯矩峰值位置随土层厚度增大而下移;土层厚度是影响群桩变位的主要因素。

The mechanical behavior of laterally loaded pile group embedded in rock is mainly affected by pile spacing, the depth embedded in rock, pile diameter, thickness of soil, and the influence is studied by numerical simulation. Based on ANSYS, we introduce the constitutive model and mechani- cal parameters of rock and soil, upon which the laterally loaded pile group embedded in rock is numer- ically simulated, and the influence of various factors on the pileg horizontal displacement is studied by orthogonal test. The results indicate that thereg a critical pile spacing and the peak moment and shear force positively correlate with pile spacing in the bottom of piles within the critical value;The moment and shear force positively correlates with the depth embedded in rock in the bottom of piles;The abso- lute value of moment and shear force ascends with the increase of pile diameter;The position of peak moment goes down with the increase of soil thickness horizontal displacement of pile group. ;Soil thickness is the main factor that affects the