Calculation method of surrounding rock pressure of deeply buried double-arch tunnel without middle drift

被引：2

作者：

Jiang C. ^{[1
,2
]}

Tang H. ^{[1
]}

Deng Q. ^{[1
]}

He Z. ^{[3
,4
]}

Bi T. ^{[1
,2
]}

机构：

[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan

[2] University of Chinese Academy of Sciences, Beijing

[3] Yunnan Meng−Lü Expressway Investment Development Co. Ltd., Puer

[4] China Railway Development Investment Group Co. Ltd., Kunming

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 03期

关键词：

deep-buried; double-arch tunnel without middle drift; surrounding rock pressure;

D O I：

10.11817/j.issn.1672-7207.2023.03.032

中图分类号：

学科分类号：

摘要：

The double-arch tunnel without middle drift cancels the construction of the middle drift, which has the engineering characteristics of excavating the two tunnels successively and construction with zero spacing, and at present, there is no uniform standard for calculating the surrounding rock pressure. Based on the Platts theory, the surrounding rock pressure of the upper part of the double-arch tunnel was regarded as the sum of the basic and additional loose load. Taking consideration of the inhibitory influence of the existing supporting structure on the loose load of the second tunnel and the influence of the construction of the second tunnel on the loose load of the first tunnel, the calculation method of surrounding rock pressure for deeply buried double-arch tunnel without middle drift was proposed. Finally, the test results of the on-site monitoring section of the Man−La tunnel were obtained for comparison and analysis. The results are shown as follows. 1) The worse the lithology of the surrounding rock, the more significant the effect of the excavation of the second tunnel on the aggravation of the basic loose load of the first tunnel, and the weaker the control and restraint effect of the existing supporting structure on the basic loose load of the second tunnel. 2) The supporting structure of the first tunnel bears a larger load of surrounding rock than the second tunnel, and the closer to the middle partition wall, the more unfavorable it is. 3) The proposed calculation method is basically consistent with the surrounding rock pressure distribution law obtained from the field test, the rationality and practicability of the derived formula are demonstrated, which can provide a reference for the design and optimization of similar engineering supporting structures in the future. © 2023 Central South University of Technology. All rights reserved.

引用

页码：1168 / 1177

页数：9

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