基于位移反分析和安全预报要求的深基坑工程施工监测

分析了深基坑工程施工监测的现状,提出了基于支护结构-土空间非线性共同作用位移反分析和安全预报双重要求的深基坑工程施工监测问题.通过拓展传统的以安全预报为主要目的的深基坑工程施工监测,在监测内容和成本增加不多的情况下,满足位移反分析对监测数据的要求.明确了其监测的作用和目的、监测系统设计的原则、监测的基本要求及监测准备工作.重点研究了位移测点的布置和数据处理等问题,提出在平面上,根据深基坑的空间效应表现规律布置测点;在剖面上根据土层、支护结构形式等布置测点.

MONITORING OF CONSTRUCTION OF DEEP FOUNDATION PIT ENGINEERING BASED ON DISPLACEMENT ANTI-ANALYSIS AND SAFETY FORECAST REQUIREMENT

This paper analysed current situation in monitoring of construction of deep foundation pit engineering,put forward the monitoring issue based on dual requirement for bracket structure-soil space non-linear co-action displacement anti-analysis and safety forecast,i.e.,meeting the requirement of displacement anti-analysis for monitoring data by broadening the traditional safety forecast-dominated monitoring work without increasing much work content and cost.The role and purpose of monitoring were made definite,including the design rule of monitoring system,basic requirement and preparatory work of monitoring.It focused on study of arrangement of displacement-measuring points and data processing,and argued that planar arrangement should be based on the spatial effect expression law of deep foundation pit,and sectional arrangement on the conditions of soil layer and bracket structure.