Upper Bound Analysis and Application for Shield Supporting Pressure in Vertical Layered Soil Stratum

Jin Cheng; Wu Fan; Sun Qianwei; Gong Qiuming; Han Peng

doi:10.3969/j.issn.1007-2993.2022.04.003

Volume 36 Issue 4

Aug. 2022

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Article Navigation > GEOTECHNICAL ENGINEERING TECHNIQUE > 2022 > 36(4): 271-277

Jin Cheng, Wu Fan, Sun Qianwei, Gong Qiuming, Han Peng. Upper Bound Analysis and Application for Shield Supporting Pressure in Vertical Layered Soil Stratum[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2022, 36(4): 271-277. doi: 10.3969/j.issn.1007-2993.2022.04.003

Citation:

Jin Cheng, Wu Fan, Sun Qianwei, Gong Qiuming, Han Peng. Upper Bound Analysis and Application for Shield Supporting Pressure in Vertical Layered Soil Stratum[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2022, 36(4): 271-277. doi: 10.3969/j.issn.1007-2993.2022.04.003

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Upper Bound Analysis and Application for Shield Supporting Pressure in Vertical Layered Soil Stratum

doi: 10.3969/j.issn.1007-2993.2022.04.003

1.
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
2.
SINOHYDRO Bureau 1 Co., Ltd., Changchun 130033, Jilin, China

Received Date: 2021-06-04
Available Online: 2022-08-08
Publish Date: 2022-08-08

Abstract

Abstract

In order to determine the shield supporting pressure for subway tunnel face in vertical layered soil stratum, based on wedge failure mode, the calculation formula of supporting pressure was derived by upper bound method of limit analysis. Under certain constraints, the optimal solution of supporting pressure was got by using MATLAB to write particle swarm optimization. The validity of the proposed solution was demonstrated by comparing the calculated results with existing literature research. The influence of various parameters on supporting pressure was analyzed. The results show that the supporting pressure decreases with the increase of soil strength. With the increase of tunnel depth ratio, supporting pressure increases first and then becomes stable. When the internal friction angle of upper soil is larger than that of the lower soil, the calculation result of considering layering is larger than that of not considering layering. Taking the Huai-Fu section of Shenzhen Metro Line 12 as an example, the theoretical calculation value of supporting pressure matches well with the measured value of earth pressure. Under the earth pressure, the EPB is tunneling stably. The upper bound method of supporting pressure can be applied in practical engineering.
- subway tunnel,
- vertical layered,
- wedge failure mode,
- upper bound method,
- supporting pressure,
- earth pressure

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Upper Bound Analysis and Application for Shield Supporting Pressure in Vertical Layered Soil Stratum

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