兰州富水砂卵石层土压平衡盾构渣土改良研究

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

›› 2017, Vol. 38 ›› Issue (S2): 279-286.doi: 10.16285/j.rsm.2017.S2.039

兰州富水砂卵石层土压平衡盾构渣土改良研究

张淑朝^1,2，贺少辉¹，朱自鹏¹，李承辉¹

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

收稿日期:2017-04-20 出版日期:2017-11-23 发布日期:2018-06-05
作者简介:张淑朝，男，1977年生，博士研究生，高级实验师，主要从事地下工程及岩土工程方面的研究。

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

ZHANG Shu-chao^1,2, HE Shao-hui¹, ZHU Zi-peng¹, LI Cheng-hui¹

1. School of Civil Engineering Beijing Jiaotong University, Beijing 100044, China ; 2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin Chengjian University，Tianjin 300384, China

Received:2017-04-20 Online:2017-11-23 Published:2018-06-05

摘要/Abstract

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。

关键词: 砂卵石层, 土压平衡盾构(EPB), 渣土改良, 塌落度试验, 渗透试验, 摩擦试验

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.

Key words: sandy pebble stratum, earth pressure balance(EPB) shield, soil conditioning, slump test, permeability test, friction test

中图分类号:

TU452

张淑朝，贺少辉，朱自鹏，李承辉,. 兰州富水砂卵石层土压平衡盾构渣土改良研究[J]. , 2017, 38(S2): 279-286.

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

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兰州富水砂卵石层土压平衡盾构渣土改良研究

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

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