A Calculation Method for Loose Soil Pressure of Fluvioglacial Deposit Tunnels: Modification and Application

WEI Xu-bo; SHI Yu-chuan; GU Xin-jie; JI Feng; ZHANG Zhen

doi:10.11988/ckyyb.20161266

PDF(1993 KB)

Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (5) : 110-114. DOI: 10.11988/ckyyb.20161266

ROCK-SOIL ENGINEERING

A Calculation Method for Loose Soil Pressure of Fluvioglacial Deposit Tunnels: Modification and Application

WEI Xu-bo¹, SHI Yu-chuan¹, GU Xin-jie², JI Feng¹, ZHANG Zhen¹

Author information +

History +

Abstract

Due to the special mechanical properties of fluvioglacial deposits, traditional tunnel pressure calculation formula does not suit for fluvioglacial deposits tunnel. In view of this, a modified Terzaghi’s loose soil pressure calculation formula suitable for fluvioglacial deposit tunnel is deduced. First of all the change rule of lateral pressure coefficient is derived by theoretical derivation, and then the stress distribution at different buried depths are compared by numerical simulation, and also the soil arching effect is analyzed. Furthermore, the modified formula is compared with the original Terzaghi’s loose soil pressure formula and the formula in China’s Railway Tunnel Design Standard. Results conclude that the tunnel pressure calculated by the Standard formula would be higher than actual value; whereas the modified Terzaghi’s loose soil pressure formula could well reflect the actual pressure of fluvioglacial deposit tunnel.

Key words

fluvioglacial deposits / loose soil pressure / soil arching effect / lateral pressure coefficient / dividing line standard for deep-and-shallow-buried tunnels

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

WEI Xu-bo, SHI Yu-chuan, GU Xin-jie, JI Feng, ZHANG Zhen. A Calculation Method for Loose Soil Pressure of Fluvioglacial Deposit Tunnels: Modification and Application[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(5): 110-114 https://doi.org/10.11988/ckyyb.20161266

References

[1] 曹伯勋.地貌学及第四纪地质学[M].北京:中国地质大学出版社,1995.
[2] 向钰周,郑颖人,王成,等. 浅埋土体隧洞松散压力计算方法的探讨——隧道稳定性分析讲座之四 [J]. 地下空间与工程学报, 2012, 8(3): 467-472.
[3] 陈若曦,朱斌,陈云敏,等. 基于主应力轴旋转理论的修正Terzaghi 松动土压力[J].岩土力学,2010,30(5):1402-1406.
[4] 谢家烋. 浅埋隧道的地层压力[J].土木工程学报,1964,(6):58-70.
[5] 周小文,濮家骝,包承纲. 砂土中隧洞开挖稳定机理及松动土压力研究[J]. 长江科学院院报,1999,16( 4) : 9-14.
[6] 周小文,濮家骝. 砂土中隧洞开挖引起的地面沉降试验研究[J]. 岩土力学, 2002,23(5):559-563.
[7] 周小文,濮家骝,包承纲. 隧洞拱冠砂土位移与破坏的离心模型试验究[J].岩土力学,1999,20(2):32-36.
[8] 黎春林.盾构隧道施工松动土压力计算方法研究[J].岩土工程学报,2014,36(9):1714-1720.
[9] 蔺港,孔令刚,詹良通,等. 基于太沙基土拱效应考虑基质吸力影响的松动土压力计算模型[J]. 岩土力学, 2015, 36(7): 2095-2104.
[10]任宏,何强,胡祥涛,等. 盾构掘进过程中隧道上覆地层松动土压力研究[J].机械工程学报,2014,50(21):17-22.
[11]SLOAN S W, ASSADI A, PURUSHOTHAMAN N. Undrained Stability of a Trapdoor[J]. Geotechnique, 1990, 40(1): 45-62.
[12]杨峰,阳军生. 浅埋隧道围岩压力确定的极限分析方法[J].工程力学,2008,25(7):179-184.
[13]HANDY R L. The Arch in Soil Arching[J]. Journal of Geotechnical Engineering, 1985, 111(3): 302-318.
[14]GIROUD J P,BONAPARTE R,BEECH J F,et al. Design of Soil Layer-geosynthetic Systems Overlying Voids[J]. Geotextiles and Geomembranes, 1990, 9(1): 11-50.
[15]加瑞.盾构隧道垂直土压力松动效应的研究[D]. 南京: 河海大学,2007.
[16]加瑞,朱伟,钟小春. 砂土拱效应的室内模型试验研究[C]∥中国岩石力学与工程学会.第二届全国岩土与工程学术大会论文集.北京:科学出版社, 2006: 335-341.
[17]朱伟,钟小春,加瑞.盾构隧道垂直土压力松动效应的颗粒流模拟[J]. 岩土工程学报, 2008, 30(5): 750-754.
[18]贾海莉,王成华,李江洪.关于土拱效应的几个问题[J].西南交通大学学报, 2003,38(4): 398-402.