›› 2018, Vol. 39 ›› Issue (7): 2318-2326.doi: 10.16285/j.rsm.2016.2225

• 基础理论与实验研究 • 上一篇    下一篇

地铁盾构隧道上方基坑开挖卸荷-加载影响研究

姚爱军，张剑涛，郭海峰，郭彦非   

  1. 北京工业大学 城市与工程安全减灾教育部重点实验室，北京 100124
  • 收稿日期:2016-09-20 出版日期:2018-07-10 发布日期:2018-08-05
  • 作者简介:姚爱军，男，1966年生，博士，教授，博士生导师，主要从事岩土工程方面的教学与科研工作。
  • 基金资助:

    国家自然科学基金项目(No. 51578023)。

Influence of unloading-loading of foundation on shield tunnel underneath

YAO Ai-jun, ZHANG Jian-tao, GUO Hai-feng, GUO Yan-fei   

  1. The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China
  • Received:2016-09-20 Online:2018-07-10 Published:2018-08-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51578023).

PDF (Chinese)

664

摘要： 为提升地铁盾构隧道的防灾减灾能力，以北京某典型地铁盾构隧道及邻域的基坑工程为基础，应用相似材料模型试验与数值模拟相结合的方法，研究了上方基坑开挖卸荷-加载作用下地铁盾构隧道的变形特征及围土压力分布规律，并对基坑底部与盾构隧道顶部净距和基坑加载强度的影响进行了分析。研究结果表明：盾构隧道上方基坑开挖卸荷-加载过程中，随着基坑开挖卸荷的进行，盾构隧道逐步上浮，基坑开挖至底部时，竖向位移达到最大值；随着基坑加载的进行，竖向位移可得到适量恢复，最大竖向位移差及最大水平位移差均出现在基坑开挖卸荷完成阶段，此时应尽早完成基础底板封闭施工。基坑开挖卸荷-加载过程中，盾构隧道围土压力始终呈葫芦型对称分布，盾构隧道顶部及底部土压力较大，腰部土压力较小，基坑开挖卸荷完成后，长轴方向土压力明显减小，基坑加载完成后，土压力有所恢复，但并未达到最初状态。随着基坑底部与盾构隧道顶部净距的增加，盾构隧道结构位移、拱顶与拱底竖向位移差及水平收敛均逐步减小，当净距大于3 h（h为基坑深度）时，上方基坑卸荷-加载对盾构隧道影响逐步趋于轻微。在基坑加载强度为卸载强度的2倍时，盾构隧道竖向位移可恢复至最初状态。

关键词: 盾构隧道, 土体卸荷, 基坑加载, 相似材料模型试验, 土压力

Abstract: To improve the disaster prevention and mitigation of metro shield tunnel, model test of similar material and numerical calculation is studied in this paper to simulate the construction of building adjacent to foundation pit in Beijing. Under unloading-loading conditions of the foundation pit above, the mechanical characteristics of shield tunnel are studied, and the influence of spacing between the bottom of the foundation pit and the shield tunnel top and the loading strength of foundation pit are also analyzed. As shown by calculation, in unloading stage, the vertical displacement of shield tunnel gradually increases. When the foundation pit is excavated to the bottom, the vertical displacement reaches the maximum value. Under loading condition, the vertical displacement of shield tunnel can be restored. The greatest impact on shield tunnel always occurs at the end of the foundation excavation. At this point, the work of foundation slab construction should be completed as soon as possible. In the unloading-loading process of foundation pit , earth pressure of shield tunnel presents calabash type symmetrical distribution. At the top and bottom of the shield tunnel the earth pressure is larger than the soil pressure in the middle of the shield tunnel. In unloading stage, the earth pressure of shield tunnel vertical axis was significantly reduced. In loading stage, the earth pressure of shield tunnel can be restored. With the spacing between the bottom of foundation pit and shield tunnel top increases, the displacement of shield tunnel, the displacement difference between arch bottom and arch and the horizontal convergence are incrementally reduced. When the spacing greater than 3 times of the depth of deep excavation, the additional deformation of shield tunnel caused by foundation pit unloading-loading effect is slightly. When the loading strength of foundation pit 2 times than the unloading strength, the vertical displacement of shield tunnel can be restored to its original state.

Key words: shield tunnel, soil unloading, the foundation loading, model test of similar material, earth pressure

中图分类号: 

  • TU 473.2

[1] 徐刚, 张春会, 于永江, . 综放工作面覆岩破断和压架的试验研究及预测模型[J]. 岩土力学, 2020, 41(S1): 106-114.
[2] 陈建功, 杨扬, 陈彦含, 陈小兵. 考虑抗拉强度的黏性填土挡土墙主动土压力计算[J]. 岩土力学, 2020, 41(6): 1829-1835.
[3] 喻昭晟, 陈晓斌, 张家生, 董亮, ABDOULKADER M S. 粗颗粒土的静止土压力系数非线性分析与计算方法[J]. 岩土力学, 2020, 41(6): 1923-1932.
[4] 史永跃, 王奎华, 董天文, 马显春, 黄永威. 真空负压静力试桩方法关键技术试验研究[J]. 岩土力学, 2020, 41(5): 1699-1708.
[5] 宋丁豹, 蒲诃夫, 陈保国, 孟庆达, . 高填方减载式刚性涵洞受力特性模型试验研究[J]. 岩土力学, 2020, 41(3): 823-830.
[6] 米博, 项彦勇, . 砂土地层浅埋盾构隧道开挖渗流稳定性的 模型试验和计算研究[J]. 岩土力学, 2020, 41(3): 837-848.
[7] 杨振兴, 陈健, 孙振川, 游永锋, 周建军, 吕乾乾, . 泥水平衡盾构用海水泥浆的改性试验研究[J]. 岩土力学, 2020, 41(2): 501-508.
[8] 魏纲, 张鑫海, 林心蓓, 华鑫欣, . 基坑开挖引起的旁侧盾构隧道横向受力变化研究[J]. 岩土力学, 2020, 41(2): 635-644.
[9] 章定文, 刘志祥, 沈国根, 鄂俊宇, . 超大直径浅埋盾构隧道土压力实测分析 及其计算方法适用性评价[J]. 岩土力学, 2019, 40(S1): 91-98.
[10] 张治国, 李胜楠, 张成平, 王志伟, . 考虑地下水位升降影响的盾构施工诱发地层 变形和衬砌响应分析[J]. 岩土力学, 2019, 40(S1): 281-296.
[11] 黄大维, 周顺华, 冯青松, 罗锟, 雷晓燕, 许有俊, . 地表均布超载作用下盾构隧道上覆土层 竖向土压力转移分析[J]. 岩土力学, 2019, 40(6): 2213-2220.
[12] 莫振泽, 王梦恕, 李海波, 钱勇进, 罗跟东, 王辉, . 粉砂地层中浓泥土压盾构泥膜效应引起的 孔压变化规律试验研究[J]. 岩土力学, 2019, 40(6): 2257-2263.
[13] 陈建旭, 宋文武, . 平动模式下挡土墙非极限主动土压力[J]. 岩土力学, 2019, 40(6): 2284-2292.
[14] 汪大海, 贺少辉, 刘夏冰, 张嘉文, 姚文博. 地层渐进成拱对浅埋隧道上覆土压力影响研究[J]. 岩土力学, 2019, 40(6): 2311-2322.
[15] 芮 瑞, 叶雨秋, 陈 成, 涂树杰. 考虑墙壁摩擦影响的挡土墙 主动土压力非线性分布研究[J]. 岩土力学, 2019, 40(5): 1797-1804.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
版权所有 © 《岩土力学》编辑部
地址：湖北武汉武昌小洪山中国科学院武汉岩土力学研究所(430071)　邮编：200042　电话：027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
本系统由北京玛格泰克科技发展有限公司设计开发