發(fā)布時(shí)間：2019-06-06 18:56

【摘要】：圓礫泥巖復(fù)合地層中盾構(gòu)微擾動(dòng)施工控制是巖土工程實(shí)踐中面臨的難題。南寧地鐵1號線盾構(gòu)下穿友愛居民小組面臨圓礫與泥巖復(fù)合地層的挑戰(zhàn),首先對泥水盾構(gòu)泥漿性能指標(biāo)進(jìn)行優(yōu)化,采用現(xiàn)場試驗(yàn)確定了富水圓礫地層袖閥管注漿加固漿液配合比;利用自動(dòng)化監(jiān)測系統(tǒng)對盾構(gòu)下穿房屋的沉降進(jìn)行實(shí)時(shí)監(jiān)控,并借助及時(shí)通訊工具實(shí)現(xiàn)穿越施工中信息化施工;定義圓礫泥巖復(fù)合地層盾構(gòu)開挖面內(nèi)泥巖高度與盾構(gòu)機(jī)刀盤直徑的比值為復(fù)合比λ,分析掘進(jìn)參數(shù)平均值隨λ的變化規(guī)律。通過現(xiàn)場實(shí)測結(jié)果表明:袖閥管注漿能夠有效的控制建筑物沉降,自動(dòng)化監(jiān)測能夠?qū)崟r(shí)反映盾構(gòu)推進(jìn)導(dǎo)致房屋變形,為施工反饋控制提供依據(jù),泥水盾構(gòu)在圓礫泥巖復(fù)合地層中會(huì)遇到開挖倉壓力波動(dòng)過大,刀盤扭矩、推力增大,貫入度降低等現(xiàn)象。當(dāng)λ≤0.15上述現(xiàn)象基本不發(fā)生;當(dāng)0.15≤λ0.6時(shí),參數(shù)平均值波動(dòng)最劇烈,對沉降控制十分不利;當(dāng)λ≥0.6時(shí),扭矩和總推力進(jìn)一步增大,但開挖倉壓力波動(dòng)情況稍弱而貫入度會(huì)進(jìn)一步降低。要以盾構(gòu)開挖倉壓力控制為指標(biāo)而非追求推進(jìn)速度,提高轉(zhuǎn)速、降低泥漿黏度是減少參數(shù)波動(dòng)的有效手段。
[Abstract]:The construction control of shield microdisturbance in round gravel mudstone composite formation is a difficult problem in geotechnical engineering practice. Under the shield of Nanning Metro Line 1, the group of friendly residents faces the challenge of gravel and mudstone composite strata. Firstly, the mud performance index of mud and water shield is optimized. The mixture proportion of slurry strengthened by sleeve valve pipe grouting in water-rich gravel formation was determined by field test. The automatic monitoring system is used to monitor the settlement of the shield pierced house in real time, and the information construction in the crossing construction is realized with the help of timely communication tools. The ratio of mudstone height in shield excavation surface to cutter diameter of shield machine in round gravel mudstone composite formation is defined as composite ratio 位, and the variation of average excavation parameters with 位 is analyzed. The results of field measurement show that sleeve valve pipe grouting can effectively control the settlement of buildings, and automatic monitoring can reflect the deformation of buildings caused by shield propulsion in real time, which provides the basis for construction feedback control. Mud-water shield in round gravel mudstone composite formation will encounter the phenomenon of excessive fluctuation of excavation silo pressure, torque of cutter head, increase of thrust, decrease of penetration and so on. When 位 鈮，

本文編號：2494525