Research on soil conditioning for earth pressure balance shield tunneling in Lanzhou sandy pebble strata with rich water

ZHANG Shu-chao; HE Shao-hui; ZHU Zi-peng; LI Cheng-hui

doi:10.16285/j.rsm.2017.S2.039

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Research on soil conditioning for earth pressure balance shield tunneling in Lanzhou sandy pebble strata with rich water

更新时间：2026-06-25

- Research on soil conditioning for earth pressure balance shield tunneling in Lanzhou sandy pebble strata with rich water
- Vol. 38, Issue S2, Pages: 279-286(2017)
- 作者机构：
  
  1. 北京交通大学土木建筑工程学院,北京,100044
  2. 天津城建大学天津市软土特性与工程环境重点实验室,天津,300384
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.S2.039
  CLC： TU452
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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ZHANG Shu-chao, HE Shao-hui, ZHU Zi-peng, et al. Research on soil conditioning for earth pressure balance shield tunneling in Lanzhou sandy pebble strata with rich water[J]. 2017, 38(S2): 279-286.
DOI：

ZHANG Shu-chao, HE Shao-hui, ZHU Zi-peng, et al. Research on soil conditioning for earth pressure balance shield tunneling in Lanzhou sandy pebble strata with rich water[J]. 2017, 38(S2): 279-286. DOI： 10.16285/j.rsm.2017.S2.039.

摘要

兰州地铁1号线穿越②-10和③-11地层，主要为砂卵石层，大部分处于地下水位以下，渗透性极强。采用土压平衡(EPB)盾构施工时，除了容易出现刀盘、螺旋输送机扭矩过高，磨损严重等现象外，还极易造成螺旋输送机喷涌，酿成工程事故，因此，需要对砂卵石层进行改良以保证盾构施工的安全。采用膨润土泥浆和泡沫对砂卵石进行改良试验，得到不同改良方案渣土的塌落度、渗透系数和钢桶侧壁的摩擦系数。在塌落度满足15～20 cm要求的前提下，通过理论计算，得到了既能满足盾构和易性要求，又能使螺旋输送机保持土压平衡、防止喷涌的改良配比方案。工程实践表明，泥浆和泡沫混合掺入比分别为7%和8%的配比方案改良效果最佳，可为土压平衡盾构在兰州市富水砂卵石层施工中渣土改良和螺旋输送机防喷涌提供参考。

Abstract

Lanzhou metro line 1 passes mainly through ②-10 and ③-11 sandy pebble strata

most of the line is under the groundwater level and the strata have high permeability. EPB (earth pressure balance) shield tunneling in such strata will not only easily lead to high torque and serious wear of cutterhead and screw convey

but also cause screw conveyor spewing

which lead to an engineering accident. Therefore

the properties of sandy pebble strata need to be improved to make the tunneling safe. Bentonite slurry and foam are selected to condition sandy pebbles. Slump

permeability coefficient and friction coefficient between the soil and steel tube are obtained by different conditioning schemes. When the slump is in the range of 15 to 20 cm

the optimal conditioning scheme which can meet the workability requirement

and can make the screw conveyor keep soil pressure balance

prevent spewing is determined by the theoretical calculation. Engineering practice shows that the effect of conditioning scheme with injection ratio of foam and slurry 7% and 8% respectively is remarkable

which can provides some guidelines for soil conditioning and screw convey anti-spewing during EPB shield tunneling in sandy pebble stratum with rich water in Lanzhou city.

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