Calculation Method for Surrounding Rock Pressure of Closely Spaced Triple Tunnels

被引：0

作者：

Wang H. ^{[1
,2
]}

Yang X. ^{[1
,2
]}

Wang B. ^{[3
]}

Luo C. ^{[1
,2
]}

机构：

[1] Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai

[2] College of Transportation Engineering, Tongji University, Shanghai

[3] China Railway Fifth Bureau Group Fourth Engineering Co., Ltd., Shaoguan, 512031, Guangdong

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2020年 / 41卷 / 03期

关键词：

Arching effect; Closely spaced triple tunnels; Protodyakonov's theory; Surrounding rock pressure;

D O I：

10.3969/j.issn.1001-4632.2020.03.08

中图分类号：

学科分类号：

摘要：

For the calculation of the surrounding rock pressure of closely spaced triple tunnels, based on the Protodyakonov's theory, the surrounding rock pressure was regarded as the sum of the basic pressure of the single-hole tunnel and the additional pressure caused by the excavation of the adjacent tunnel. The calculation method of the surrounding rock pressure suitable for closely spaced triple tunnels was put forward. According to this calculation method, the influence of different rock pillar thicknesses, excavation spans and excavation heights on the surrounding rock pressure was studied. The calculation method was applied to determine the surrounding rock pressure of closely spaced triple tunnels in Badaling Great Wall Station. Results show that with the increase in the thickness of rock pillar, the surrounding rock pressure decreases continuously. When the thickness of rock pillar reaches a certain value, the surrounding rock pressure is the same as that of a single-hole tunnel. The variations in rock pillar thickness, side tunnel span and middle tunnel height affect the overall surrounding rock pressure, while the middle tunnel span and side tunnel height affect the surrounding rock pressure of each single tunnel only. The optimal excavation sequence of closely spaced triple tunnels is "first side tunnel, then middle tunnel". The surrounding rock pressure of the middle tunnel is greater than that of the side tunnel, and the maximum stress value is at the top of the middle tunnel. During the construction, attention should be paid to the stability of the surrounding rock of the middle tunnel, and effective measures should be taken to reinforce the rock pillar area. © 2020, Editorial Department of China Railway Science. All right reserved.

引用

页码：68 / 75

页数：7

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