Study on model test and numerical simulation of layered soft rock tunnel construction with different large deformation grades

被引：0

作者：

Zhao L. ^{[1
]}

Yang W. ^{[1
]}

Pan W. ^{[1
]}

Wu F. ^{[1
]}

Wang Z. ^{[1
]}

Yang Z. ^{[2
]}

机构：

[1] Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Sichuan, Chengdu

[2] Sichuan Mianjiu Expressway Co., Ltd., Sichuan, Mianyang

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2024年 / 43卷 / 02期

关键词：

asymmetry analysis; large deformation grade; layered soft rock; tunnel deformation control; tunnel engineering;

D O I：

10.13722/j.cnki.jrme.2023.0356

中图分类号：

学科分类号：

摘要：

To explore the asymmetric failure characteristics of layered soft rock tunnels in complex and difficult mountainous areas, and to propose reasonable construction deformation control technologies for layered soft rock tunnels under different large deformation grades, by taking a typical layered soft rock tunnel of Jiuzhaigou-Mianyang expressway, a large deformation grade classification standard for layered soft rock tunnels in complex and difficult mountainous areas was established as the engineering background. Then a series of studies were conducted on the influence of construction methods and support patterns on the mechanical behavior of layered soft rock tunnels under different large deformation grades through model tests and numerical simulations. The research results indicate that the most unfavorable position for the spatial asymmetric distribution of stress and deformation in layered soft rock tunnels is located in the normal or tangential position of the bedding plane due to the coupling effect of stress field and soft bedding direction, and the asymmetric mechanical characteristics of the tunnel become more obvious with the increase of large deformation grade(slight, medium and strong). Additionally, there are differences in the improvement effects of construction methods and support patterns on the deformation and stress of layered soft rock tunnels under different large deformation grades. Therefore, for three types of layered soft rock tunnels with large deformation grades, the recommended construction deformation control technologies for two-step construction＋single-layer primary support＋short rock bolt support, three-step construction＋single-layer primary support＋long and short rock bolt support, and three-step reserved core soil construction＋double-layer primary support＋long and short rock bolt support were proposed separately. © 2024 Academia Sinica. All rights reserved.

引用

页码：454 / 467

页数：13

共 36 条

[21]

LI Lei, TAN Zhongsheng, YU Yu, Et al., Experimental study on primary lining form of tunnels in phyllite on Chengdu-Lanzhou railway, China Civil Engineering Journal, 50, pp. 19-24, (2017)

[22]

ZHOU Yi, HE Chuan, ZOU Yulin, Et al., Experimental study of comparison and optimization of tunneling schemes in crushing phyllite, Chinese Journal of Rock Mechanics and Engineering, 32, 3, pp. 537-548, (2013)

[23]

LI Lei, TAN Zhongsheng, GUO Xiaolong, Et al., Research on large deformation of tunnels with small intervals in squeezing steeply dipping phyllite strata, Chinese Journal of Rock Mechanics and Engineering, 38, 2, pp. 276-286, (2019)

[24]

WANG Bo, YANG Yi, HE Chuan, Et al., Safety control criteria of displacement during construction of broken phyllite tunnels, Chinese Journal of Rock Mechanics and Engineering, 35, 11, pp. 2287-2297, (2016)

[25]

LI Dan, XIA Binwei, CHEN Hao, Et al., Research on stability of tunnel in anisotropic layered rockmass with low inclination angle bedding by model test, Rock and Soil Mechanics, 30, 7, pp. 1933-1938, (2009)

[26]

CHEN Feng, Experimental study for structure effect of floor heave in deep slowly inclined soft stratum rock mass, (2018)

[27]

WANG Eryu, Modeling of failure mechanism and control techniques for entry stability in slowly inclined jointed rock mass due to excavation unloading effect, (2019)

[28]

XIA Binwei, Experimental study on the mechanism of instability of layered rock mass in deep buried tunnel, (2009)

[29]

SASONG M, PARK D, YOO J, Et al., Experimental and numerical analyses of an opening in a jointed rock mass under biaxial compression, International Journal of Rock Mechanics and Mining Sciences, 48, 7, pp. 1055-1067, (2011)

[30]

CHEN Ziquan, HE Chuan, WU Di, Et al., Study of large deformation classification criterion for layered soft rock tunnels under high geostress, Journal Southwest Jiaotong University, 53, 6, pp. 1237-1244, (2018)

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