Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (6): 2110-2121.doi: 10.16285/j.rsm.2019.1102

• Numerical Analysis • Previous Articles     Next Articles

Research on surface frost heave and thaw settlement law and optimization of frozen wall thickness in shallow tunnel using freezing method

ZHENG Li-fu1, GAO Yong-tao1, ZHOU Yu1, TIAN Shu-guang2   

  1. 1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China; 2. China Railway 16th Bureau Group Co., Ltd., Beijing 100018, China
  • Received:2019-06-24 Revised:2019-10-30 Online:2020-06-11 Published:2020-08-02
  • Contact: 高永涛，男，1962年生，博士，教授，博士生导师，主要从事岩土工程和采矿工程方面的教学和研究工作。E-mail: 13901039214@163.com E-mail: lifuzhengustb@126.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51674015) and the Fundamental Research Funds for the Central Universities (FRF-TP-18-016A3).

PDF (Chinese)

190

PDF (English)

9

Abstract: There are strict requirements on surface displacement caused by frost heaving and thawing settlement for the shallow tunnels. To improve the frozen wall design of the contact channel in Zhuhai Urban-Airport Interity Railway transit project, the finite difference numerical calculation method is used to simulate the whole process of the artificial ground freezing method based on the thermal-mechanical coupling theory. The optimal design of the thickness of the frozen wall is achieved by comparing the surface displacement of frost heaving, thaw settlement and the deformation of the tunnel segment in models with different frozen wall thicknesses. Results show that: 1) the finite difference numerical model can effectively predict the development of the surface displacement caused by frost heaving and thaw settlement, and an actual deformation prediction value of high accuracy can be obtained with the known error. 2) The frost heaving and thaw settlement of different models almost have the same feature, but the deformation amount and the influence range decrease with the decrease of the thickness of the frozen wall. When the thickness of the frozen wall is less than 2.5 m, the deformation meets the requirements. 3) The frost heaving and thaw settlement of the soil are not simple reciprocal processes. The thaw settlement is usually larger than the heaving deformation, and the averaged excess amount is around 40%. 4) The greater the thickness of the frozen wall is, the greater the frost heave force is. By optimizing the thickness of the frozen wall, the additional stress and deformation of the tunnel segment can be effectively controlled to protect the structure of the existing tunnel. 5) The thickness of 2.5 m is chosen for the improved frozen wall. The research results are directly applied to the construction of the No. 4 communication channel using the freezing method. Combined with the on-site monitoring test, the deformation of each characteristic point is within a reasonable range, indicating that the optimization scheme is practical and feasible, and can be successfully applied in the design of frozen wall thickness in similar projects.

Key words: shallow tunnel, frost heave and thaw settlement, thermal-mechanical coupling theory, frozen wall, thickness optimization

CLC Number: 

  • U 459.5
[1] ZHENG Li-fu, GAO Yong-tao, ZHOU Yu, TIAN Shu-guang. Research on optimization of frozen wall thickness of underwater tunnel based on fluid-solid coupling theory [J]. Rock and Soil Mechanics, 2020, 41(3): 1029-1038.
[2] WANG Da-hai, HE Shao-hui, LIU Xia-bing, ZHANG Jia-wen, YAO Wen-bo. Studies of the progressive ground arching on the loosening pressure above shallow tunnels [J]. Rock and Soil Mechanics, 2019, 40(6): 2311-2322.
[3] LIU Yang-hui, HU Xiang-dong, . Mechanical analysis of frozen soil wall of vertical mine in unloading state [J]. Rock and Soil Mechanics, 2018, 39(S2): 344-350.
[4] ZENG Gui-sen, Lü Ai-zhong. Analytical solution for shallow circular tunnel under action of tectonic stress [J]. , 2017, 38(S1): 79-86.
[5] REN Jian-xi, SUN Jie-long, ZHANG Kun, WANG Jiang, WANG Dong-xing. Mechanical properties and temperature field of inclined frozen wall in water-rich sand stratum [J]. , 2017, 38(5): 1405-1412.
[6] GUAN Hua-dong, ZHOU Xiao-min. Comparative study of elastoplastic of frozen wall based on interaction of surrounding rock [J]. , 2017, 38(3): 649-655.
[7] SHI Rong-jian, YUE Feng-tian, ZHANG Yong, LU Lu, . Model test on freezing reinforcement for shield junction Part 1: Distribution characteristics of temperature field in soil stratum during freezing process [J]. , 2017, 38(2): 368-376.
[8] WANG Hua-ning, WU Lei,. Aging mechanical response of shallow tunnel excavation under slope boundary considering the supporting effect [J]. , 2016, 37(S2): 83-93.
[9] CHENG Xiao-hu , PANG Zhen-yong , ZENG Dong-yang , ZENG De-guang，. Theoretical research on whole stability of unlined shallow earth tunnels based on ultimate surcharge [J]. , 2016, 37(3): 835-841.
[10] YANG Feng , ZHENG Xiang-cou , ZHAO Lian-heng , SHI Jie-hong , YANG Jun-sheng，. Finite element upper bound analysis of tunnel instability under surcharge loading [J]. , 2015, 36(S2): 695-701.
[11] XIA Yuan-you , CHEN Chun-shu , BAKRI Mudthir , WANG Zhi-de , ZHOU Xiong，. Analysis of horizontal displacement of soil induced by shallow tunnel excavation [J]. , 2015, 36(2): 354-360.
[12] CAI Hai-bing , PENG Li-min , ZHENG Teng-long,. A method for predicting ground surface settlement in the artificial thawing period of tunnel horizontally frozen wall [J]. , 2015, 36(12): 3516-3522.
[13] YANG Jun-sheng，ZHANG Jian，YANG Feng. Stability analysis of shallow tunnel face using two-dimensional finite element upper bound solution with mesh adaptation [J]. , 2015, 36(1): 257-264.
[14] WANG Zhi-wei , QIAO Chun-sheng , SONG Chao-ye，. Calculation method of relaxation pressure of shallow large span tunnel in up-soft/low-hard rock stratum [J]. , 2014, 35(8): 2342-2352.
[15] GUAN Xiao-ming，FU Hong-xian，WANG Meng-shu. Blasting vibration characteristics monitoring of tunnel under-passing hillside buildings in short-distance [J]. , 2014, 35(7): 1995-2003.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] XU Jin-ming, QIANG Pei, ZHANG Peng-fei. Texture analysis of photographs of silty clay[J]. , 2009, 30(10): 2903 -2907 .
[2] CHU Xi-hua, XU Yuan-jie. Studies on transformation from M-C criterion to Drucker-Prager criterions based on distortion energy density[J]. , 2009, 30(10): 2985 -2990 .
[3] LIU Zhen-ping, HE Huai-jian, LI Qiang， ZHU Fa-hua. Study of the technology of 3D modeling and visualization system based on Python[J]. , 2009, 30(10): 3037 -3042 .
[4] SUN Wen-jing，SUN De-an，MENG De-lin. Compression deformation characteristics of saturated bentonite and sand-bentonite mixtures[J]. , 2009, 30(11): 3249 -3255 .
[5] MA Qing，ZHAO Jun-hai，WEI Xue-ying. Investigation of rock resistant coefficient in rocks around tunnel based on unified strength theory[J]. , 2009, 30(11): 3393 -3398 .
[6] XIA Dong-zhou，HE Yi-bin，LIU Jian-hua. Analysis of aseismic capability and influential factors for rigid pile composite foundation-superstructure dynamic interaction system[J]. , 2009, 30(11): 3505 -3511 .
[7] JIA Jian-qing, WANG Hong-tu, LIU Da-peng, AN Long-qi. Monitoring and analysis of tunnel surface stability[J]. , 2009, 30(12): 3765 -3770 .
[8] DONG Cheng, ZHENG Ying-ren, CHEN Xin-ying, TANG Xiao-song. Research on composite support pattern of soil nails and prestressed anchors in deep foundation pits[J]. , 2009, 30(12): 3793 -3796 .
[9] QI Ji-lin，MA Wei. State-of-art of research on mechanical properties of frozen soils[J]. , 2010, 31(1): 133 -143 .
[10] LIU Dou-dou, CHEN Wei-zhong, YANG Jian-ping, TAN Xian-jun, ZHOU X. Experimental research on strength characteristic of brittle rock unloading confining pressure[J]. , 2009, 30(9): 2588 -2594 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd