盾构穿越始发段土体加固区时土体沉降扰动分析

发布时间：2018-07-31 09:03

【摘要】：在整个盾构的掘进施工过程中,其始发段施工是事故频发的危险区段。为此,以武汉市地铁江汉路到积玉桥越江段施工为背景,选用FLAC3D软件对盾构穿过始发段全过程的土体扰动规律进行分析。数值仿真分析结果表明:在始发阶段盾构经过土体加固区时,土体横断面沉降槽呈现正态分布规律;将土体加固后,加固区的地表沉降很小,表明加固区土体受到的盾构施工扰动效应较非加固区明显减小;盾构中部通过加固区和非加固区分界面时地表沉降增加速率最大,盾构机前部和尾部通过时地表沉降增加的速率较小;盾构掘进过程中非加固区土层的沉降槽均呈现正态分布,盾构掘进主要影响盾构开挖洞口横向两侧18~22 m范围内土体,以及纵向15~20 m范围内的土体。
[Abstract]:In the whole shield tunneling construction process, the initial section construction is a dangerous section with frequent accidents. Therefore, based on the construction of Jianghan Road to Jiyu Bridge in Wuhan City, FLAC3D software is selected to analyze the disturbance law of soil mass in the whole process of shield tunneling through the initial section. The results of numerical simulation analysis show that when shield tunneling passes through the soil reinforcement zone, the soil cross-section settlement trough presents normal distribution law, and the surface settlement of the strengthened area is very small after the reinforcement of the soil. The results show that the disturbance effect of shield construction on the soil in the strengthened area is obviously smaller than that in the unreinforced zone, and the increase rate of ground subsidence is the largest when the middle part of shield tunnel passes through the strengthened zone and the unstrengthened boundary. The increase rate of ground subsidence is small when the front and tail of shield machine pass through, the settlement trough of soil layer in unreinforced area is normal distribution during shield tunneling, and shield tunneling mainly affects the soil within 1822 m of transverse side of shield tunneling. And the soil in the longitudinal range of 15 ~ 20 m.
【作者单位】：华中科技大学土木工程与力学学院;武汉地铁集团有限公司;
【基金】：国家自然科学基金项目(51378235;71571078;51308240) 湖北省自然科学基金重点项目(ZRZ2014000104)
【分类号】：U455.43

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