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.
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页码：2882 / 2891
页数：9
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