隧道开挖会引起地表和深层土体沉降,研究地层移动规律对于确定建筑物风险等级和保护邻近建筑物具有重要意义。首先,基于Peck公式并考虑深层土体横向沉降槽引起建筑物的沉降和倾斜,得到了建筑物风险区计算模型;然后,通过改变参数,分析了隧道直径D、基础埋深d以及地层损失率VL等对建筑物风险区大小的影响规律,推导得到了风险区的边界值(C/D)0和(x/D)0。最后,根据不同风险控制等级,提出了隧道开挖对邻近建筑物风险的初步评估方法,并将风险区划分为4个部分。研究结果表明:所提风险区划分方法仅需隧道直径D、地层损失率值VL、隧道埋深Z以及沉降槽宽度系数i即可实现,具有简单、高效等特点,且能够反映不同参数对风险区变化的影响。研究结果可为隧道开挖对邻近建筑物安全影响初步判断和风险预估提供参考。
Abstract
Tunnel excavation will cause surface and subsurface settlement. Studying the law of formation movement is of great significance to determine the risk level of buildings and protect adjacent buildings.Firstly,the calculation model of risk zone is obtained based on Peck's formula considering the settlement and inclination of buildings caused by subsurface settlement trough. Secondly, the influence rules of tunnel diameter D, foundation depth d and ground loss ratio VL on the size of the building risk zone are analyzed, and the boundary values (C/D)0 and (x/D)0 of risk zone are deduced. Finally, according to different risk control levels, a preliminary risk assessment method for adjacent buildings during tunnel excavation is proposed, and the risk zone is divided into four zones. The risk zoning method proposed in this paper is simple and highly-efficient as only four parameters are needed: tunnel diameter D, ground loss ratio VL, tunnel's buried depth Z and coefficient i of settlement trough width. The method also reflects the influence of different parameters on the change of risk zone. The research findings provide reference for preliminary judgment and risk prediction of the impact of tunnel excavation on adjacent buildings' safety.
关键词
隧道工程 /
Peck公式 /
沉降槽 /
邻近建筑物 /
风险区划分
Key words
tunnel engineering /
Peck's formula /
settlement trough /
adjacent buildings /
risk zoning
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参考文献
[1] PECK R B.Deep Excavations and Tunnelling in Soft Ground[C]//Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico, 1969: 225-290.
[2] MONSEES J E. Soft Ground Tunneling[M]//Tunnel Engineering Handbook. USA: Springer, 1996: 97-121.
[3] MAIR R J, TAYLOR R N, BRACEGIRDLE A. Subsurface Settlement Profiles above Tunnels in Clays[J]. Geotechnique, 1993, 43(2): 315-320.
[4] 韩 煊. 隧道施工引起地层位移及建筑物变形预测的实用方法研究[D]. 西安:西安理工大学, 2007.
[5] 魏 纲. 盾构隧道施工引起的土体损失率取值及分布研究[J]. 岩土工程学报, 2010, 28(9): 1354-1361.
[6] 朱才辉,李 宁.地铁施工诱发地表最大沉降量估算及规律分析[J].岩石力学与工程学报,2017,36(增刊1):3543-3560.
[7] 银英姿, 赵 强, 崔芳静, 等. 土压平衡矩形顶管施工引起的地表沉降探究[J].长江科学院院报, 2019, 36(1): 95-101.[8] 张顶立, 李鹏飞, 侯艳娟, 等. 浅埋大断面软岩隧道施工影响下建筑物安全性控制的试验研究[J]. 岩石力学与工程学报, 2009, 28(1): 95-102.
[9] 柳厚祥, 任志勇, 陈思宇. 隧道不同位置下穿施工引起邻近建筑物的变形分析[J]. 土木工程学报, 2014,47(8): 128-137.
[10] FINNO R J,VOSS JR F T,ROSSOW E,et al.Evaluating Damage Potential in Buildings Affected by Excavations[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(10):1199-1210.
[11] 孙宇坤, 关富玲. 盾构隧道掘进对砌体结构建筑物沉降的影响[J]. 中国铁道科学, 2012, 33(4): 38-44.
[12] RANKIN W. Ground Movements Resulting from Urban Tunnelling: Predictions and Effects[J]. Geological Society London Special Publications, 1988, 5(1): 79-92.
[13] 黄建玲,杨广武, 徐会杰, 等. 邻近暗挖地铁建筑物安全评价方法[J]. 中国铁道科学, 2009, 30(2): 77-81.
[14] CLARKE J A,LAEFER D F.Evaluation of Risk Assessment Procedures for Buildings Adjacent to Tunnelling Works[J]. Tunnelling and Underground Space Technology, 2014, 40: 333-342.
[15] JACOBSZ S W. The Effects of Tunnelling on Piled Foundations[D]. Cambridge: Cambridge University, 2002.
基金
国家自然科学基金青年基金项目(51708199);中央高校基本科研业务费专项基金(531107050969);贵州省交通运输厅科技项目(2017-143-054);北京市科技计划项目 (Z181100003918005);国家重点研发计划项目(2019YFB1705201)
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