单排桩支护结构验算及敏感性参数分析  

Checking Calculation and Sensitivity Parameter Analysis of Single Row Pile Support Structure

作　　者：陈浩 CHEN Hao

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《内蒙古公路与运输》2023年第1期38-42,共5页Highways & Transportation in Inner Mongolia

摘　　要：以某下沉式隧道为工程背景,为实现横向支撑布置的优化设计,对单排桩支护结构进行结构验算及敏感性参数分析。研究结果表明:钢支撑层数的增加导致最大位移值和最大沉降值逐渐减小,当钢支撑达到两层时,最大沉降值、最大位移值以及抗倾覆安全系数均可控制在设计标准范围内;随着两道钢支撑竖向间距从1 m开始增加,两道钢支撑的支反力变化有明显差异,弯矩值、沉降值和位移值先减小后增大,在3 m~5 m位置时取得最小值;而最大沉降和位移值与灌注桩嵌固深度存在显著的负相关关系,当嵌固深度达到3 m后,沉降变形值基本维持不变;地下水位至基坑底部距离的增加对最大沉降值和位移值无明显影响。In order to realize the optimal design of the lateral support arrangement, the structural checking calculation and sensitivity parameter analysis are carried out for the single-row pile support structure of a subsided tunnel. The results show that the increase of steel support layers leads to the gradual decrease of maximum displacement and maximum settlement. When the steel support reaches 2 layers, the maximum settlement value, the maximum displacement value and the overturning safety coefficient can be controlled within the design standard. With the vertical spacing of two steel supports increasing from 1m, the change of the reaction force of the two steel supports is significantly different. The flexural torque, settlement value and displacement value decrease first and then increase, and the minimum value is observed at the position of 3 m to 5 m. There is a significant negative correlation between the maximum settlement and displacement values and the embedded depth of grouted pile, and the change of settlement and deformation values is very small after the embedded depth reaches 3m. The increase of the distance from the underground water level to the bottom of the foundation pit has no obvious effect on the maximum settlement value and displacement value.

关 键 词：支护结构 单排桩 沉降 敏感性 监控 

分 类 号：U455.91[建筑科学—桥梁与隧道工程]