Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (7): 2283-2292.doi: 10.16285/j.rsm.2019.1620

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A theoretical study of porosity characteristics on the excavation face of slurry shield in sand stratum

MAO Jia-hua1, YUAN Da-jun1, YANG Jiang-xiao2, ZHANG Bing3   

  1. 1. Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing, 100044, China; 2. Shantou Suai Channel Construction Investment Development Co. Ltd., Shantou, Guangdong 515071, China; 3. Shield Machine and Boring Technology, China Railway Tunnel Group Co., Ltd., Zhengzhou, Henan 450001, China
  • Received:2019-09-19 Revised:2019-12-30 Online:2020-07-10 Published:2020-09-13
  • Supported by:
    This work was supported by the Fundamental Research Funds for the Central Universities (2018YJS105), the Joint Funds of the National Natural Science Foundation of China (C19A1500010) and the National Natural Science Foundation of China (51678037).

PDF (Chinese)

163

PDF (English)

8

Abstract: To maintain the stability of excavation face in slurry shield, a filter cake must be timely formed during the excavation work. With the filter cake, the slurry pressure can counteract the earth pressure and water pressure in the excavation stratum. In this study, a mathematical model of slurry penetration under constant pressure in sand stratum is established by considering the filtration effect. By means of this model, the influence of penetration time, slurry concentration, slurry pressure and initial stratum porosity on soil porosity and filter cake formation is analyzed. Combining the periodic disturbance of cutting-tools, the variation of soil porosity on the excavation face caused by multiple slurry penetration is summarized. Finally, the supporting mechanism of the excavation face is discussed during the shield tunneling based on the design of cutting wheel and tunneling parameters. The study results show that the slurry penetration behaviour is mainly affected by the characteristics of slurry stratum without disturbance of cutting-tools. In contrast, with the periodic disturbance of cutting-tools, the decreasing cycle of cutting will increase the difficulty of filter cake formation under the same cutting depth. In addition, the filter cake formation and the stability of excavation face can be significantly improved if the number of cutting-tools on same cutting track is reduced and the advance speed of shield and rotate speed of cutting wheel are decreased appropriately.

Key words: slurry shield, porosity characteristics, theoretical analysis, excavation face, filter cake, sand stratum

CLC Number: 

  • TU 441
[1] SONG Wen-cheng, LIANG Zheng-zhao, . Investigation on failure characteristics and water inrush risk of inclined floor mining above confined aquifer [J]. Rock and Soil Mechanics, 2020, 41(2): 624-634.
[2] MO Zhen-ze, WANG Meng-shu, LI Hai-bo, QIAN Yong-jin, LUO Gen-dong, WANG Hui, . Laboratory investigation on pore water pressure variation caused by filter cake effect during slurry-EPB shield tunneling in silty sand layer [J]. Rock and Soil Mechanics, 2019, 40(6): 2257-2263.
[3] MA Kai, YIN Li-ming, CHEN Jun-tao, CHEN Ming, WANG Zi-qi, CUI Bo-qiang,. Theoretical analysis on failure of water-resisting key strata in the floor by local high confined water in deep mining [J]. , 2018, 39(9): 3213-3222.
[4] LI Qing-chuan, LI Shu-cai, WANG Han-peng, ZHANG Hong-jun,ZHANG Bing, ZHANG Yu-qiang,. Stability analysis and numerical experiment study of excavation face for tunnels overlaid by quicksand stratum [J]. , 2018, 39(7): 2681-2690.
[5] ZHANG Zhi-guo, MA Bing-bing, HUANG Mao-song, XU Xiao-yang，. Influence analyses on force and deformation of existing tunnels induced by landslide in mountain region [J]. , 2018, 39(10): 3555-3564.
[6] ZHOU Li-duo, KONG Gang-qiang, PENG Huai-feng, GU Hong-wei, ZHU Xi，. Theoretical analysis of bearing capacities of pile group under oblique load [J]. , 2017, 38(9): 2647-2654.
[7] MA Chun-jing, JIANG An-nan, JIANG Zong-bin, WANG Shan-yong,. Hydro-mechanical coupled simulation and analysis of shield tunnel construction based on the zone state index [J]. , 2017, 38(6): 1762-1770.
[8] 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.
[9] ZHANG Ya-zhou, MIN Fan-lu, SUN Tao, SHI Hai-ling, LI Dong-sheng,. Analysis of causes for ground subsidence induced by slurry shield shutdown in hard plastic clay [J]. , 2017, 38(4): 1141-1147.
[10] ZHANG Zhi-guo, XU Xiao-yang, JIANG Yun-juan, ZHAO Qi-hua，. Analysis of the safety distance and the stability of the tunnel orthogonally crossing the landslide [J]. , 2017, 38(11): 3278-3286.
[11] ZHANG Chang-guang, ZENG Kai-hua, . Comparisons of spatial-effect approaches for tunnel excavation using convergence-confinement method [J]. , 2016, 37(5): 1417-1424.
[12] Lü Xi-lin, ZHOU Yun-cai, LI Feng-di, . Centrifuge model test and numerical simulation of stability of excavation face of shield tunnel in silty sand [J]. , 2016, 37(11): 3324-3328.
[13] HUANG Bo-qi , ZHU He-hua , . Volumetric yielding mechanism of hardening-soil model and its constitutive integration algorithm [J]. , 2015, 36(S1): 31-37.
[14] ZHANG Zi-xin , ZHANG Fan , . Visualization and calculation models for TBM face support pressure in soft ground [J]. , 2015, 36(11): 3193-3200.
[15] QIAO Li-ping , LIU Jie , LI Shu-cai , WANG Zhe-chao , JIANG Yan-yan , WANG Zi-hao，. Study of spatial effect of excavation face for underground facility and its application [J]. , 2014, 35(S2): 481-487.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] YAO Yang-ping, HOU Wei. Basic mechanical behavior of soils and their elastoplastic modeling[J]. , 2009, 30(10): 2881 -2902 .
[2] SHI Yu-ling, MEN Yu-ming, PENG Jian-bing, HUANG Qiang-bing, LIU Hong-jia. Damage test study of different types structures of bridge decks by ground-fissure[J]. , 2009, 30(10): 2917 -2922 .
[3] ZHANG Li-ting, QI Qing-lan, WEI Jing HUO Qian, ZHOU Guo-bin. Variation of void ratio in course of consolidation of warping clay[J]. , 2009, 30(10): 2935 -2939 .
[4] ZHANG Qi-yi. Study of failure patterns of foundation under combined loading[J]. , 2009, 30(10): 2940 -2944 .
[5] ZHANG Ming-yi, LIU Jun-wei， YU Xiu-xia. Field test study of time effect on ultimate bearing capacity of jacked pipe pile in soft clay[J]. , 2009, 30(10): 3005 -3008 .
[6] 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 .
[7] WU Liang, ZHONG Dong-wang, LU Wen-bo. Study of concrete damage under blast loading of air-decking[J]. , 2009, 30(10): 3109 -3114 .
[8] ZHANG Jia-fa, DING Pei-zhong, ZHANG Wei, HU Zhi-jing. Studies of permeability and seepage deformation characteristics of cushion material for Shuibuya Concrete Faced Rockfill Dam[J]. , 2009, 30(10): 3145 -3150 .
[9] ZHOU Xiao-jie, JIE Yu-xin, LI Guang-xin. Numerical simulation of piping based on coupling seepage and pipe flow[J]. , 2009, 30(10): 3154 -3158 .
[10] DING Pei-zhong, ZHOU Mi, ZHANG Wei. Experimental research on clogging of mat base of inside and outside liner of Yellow River-crossing tunnel by concrete construction[J]. , 2009, 30(10): 3159 -3162 .
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