Effect of unloading on surrounding rock pressure of super large-section tunnel

被引：0
|
作者：
Cao Z. [1 ]
Xie Q. [1 ]
Song Z. [2 ,3 ]
Wang J. [2 ,3 ]
机构：
[1] School of Civil Engineering, Chongqing University, Chongqing
[2] School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an
[3] Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an
来源：
Song, Zhanping (songzhpyt@xauat.edu.cn) | 1600年 / Academia Sinica卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Excavation by steps; Super large-section; Surrounding rock pressure; Tunnel engineering; Unloading effect;
D O I：
10.13722/j.cnki.jrme.2019.0835
中图分类号：
学科分类号：
摘要：
During the excavation by steps of super large-section tunnel, the stress of surrounding rock changes correspondingly, and each step of excavation has different impacts on rock mass. Based on the theory of unloading rock mass mechanics, the different unloading zone and the quality deterioration of surrounding rock are constantly changing in tunnel construction. Combined with double side heading construction of a super large-section tunnel in Guanshui Road station of Guiyang Metro Line 2, the effect of unloading on the depth of pressure arch of super large-section tunnel was analyzed by numerical simulation and theoretical analysis. The unloading effect coefficient was introduced to improve the existing method for calculating the process load of tunnel, and the results were compared with those of the calculation method of process load of existing tunnel and the recommended calculation method of highway tunnel. Comparing with the back analysis and calculation results of surrounding rock pressure based on field displacement monitoring data, the calculation results of the improved method were basically consistent with that, and it shows the method had high accuracy. © 2020, Science Press. All right reserved.
引用
收藏
页码：2882 / 2891
页数：9
相关论文
共 23 条
  • [1] JIN Xingliang, QU Xibo, Analysis of influence of shield tunnel annular space filling grouting on deformation law of above existing metro tunnel, Railway Engineering, 58, 11, pp. 74-77, (2018)
  • [2] QU Haifeng, YANG Zhongcun, ZHU Hehua, Et al., Research and development on surrounding rock pressure of road tunnel, Chinese Journal of Underground Space and Engineering, 3, 3, pp. 536-543, (2007)
  • [3] JTGD7-2004 Code for design of road tunnel, (2004)
  • [4] QU haifeng, Study on load mode of road tunnel with extra-large cross section and low flat-ratio and its application
  • [5] Review on China's Tunnel Engineering Research, China Journal of Highway and Transport, 28, 5, pp. 1-65, (2015)
  • [6] DING Wenqi, WANG Xiaoxing, ZHU Hehua, Et al., Defining method for designing load of multi-arch Tunnel, China Journal of Highway and Transport, 20, 5, pp. 78-82, (2007)
  • [7] QU Haifeng, ZHU Hehua, CAI Yongchang, Discussion on calculation of loose load on extra-large ross-section and large-span road tunnel, Rock and Soil Mechanics, 29, 4, pp. 989-994, (2008)
  • [8] YANG Zongxue, FANG Yingguang, LIU Tingjin, Effect of stress path on surrounding rock pressure of super large-section tunnel, Chinese Journal of Rock Mechanics and Engineering, 28, 11, pp. 2228-2234, (2009)
  • [9] ZHENG Kangcheng, DING Wenqi, JIN Wei, Et al., Experimental and numerical study on staged construction pressure arch of super large section tunnel, Chinese Journal of Geotechnical Engineering, 37, pp. 72-77, (2015)
  • [10] WAN Fei, XU Chongbang, WANG Hualao, Study on calculation method for loosening load of deep-buried large cross-section road tunnel, Chinese Journal of Rock Mechanics and Engineering, 36, pp. 3423-3430, (2017)
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