城市地下工程中尺度试验装置的研制及初步试验应用  

DEVELOPMENT AND PRELIMINARY TEST OF EQUIPMENT OF MESOSCALE TEST IN URBAN UNDERGROUND ENGINEERING

作　　者：覃卫民[1] 任伟中[1] 周正明[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩石力学与工程学报》2012年第A02期3994-4000,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB732101)

摘　　要：针对城市建设中公路隧道、地铁及市政隧道建设带来一系列的环境保护问题,开展中尺度物理模型试验装置的研制,该试验装置主要由试验台架系统、测试装置和掘进系统等3个独立部分组成。通过对掘进系统的特色设计,分别实现隧道开挖、地铁盾构开挖和管涵顶推等施工方式对地层环境的影响模拟。通过地层材料配比试验,得到试验材料选择的试验方法和流程。隧道开挖模型的初步试验表明,采用Peck公式预测的地表沉降值偏小,且横向沉降槽曲线形状与高斯分布有一定的差距,因此不宜将Peck公式用于该类型土力学试验的地表沉降预测。同时,就隧道开挖模拟的初步试验发现的一些问题进行分析并给予后续研究展望。Aiming at a series of environmental protection problem brought by urban construction including highway tunnel,subway and tunnel construction,the development of mesoscale physical scale model test equipment is carried out.The test equipment mainly consists of bench system,measuring equipment,and tunnelling system,which belongs to separate component.Because of the characteristics design of tunnelling system,influence on surrounding environment by physical simulation of different construction methods are respectively achieved in three aspects including tunnelling,underground excavation and pipe culverts shield pushing.After the materials formation ratio test,the test methods and processes of geologic strata material are selected.The preliminary test of tunnelling model shows that the value of surface subsidence predicted by Peck formulas is too small,and its transverse settlement trough shape has a certain gap by comparing with Gaussian curve,so it is not appropriate for prediction of surface subsidence by Peck formulas in this type of soil mechanics test.According to some of the questions found in preliminary tests of tunnelling simulation,some follow-up research prospects are given by the researchers.

关 键 词：地下工程 开挖模拟 隧道模型 地表沉降 

分 类 号：U91[交通运输工程]