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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第10期    总第254期    2015年10月

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文章编号:1672-7207(2015)10-3814-08
软土地区土压平衡盾构反扭矩分析
梁荣柱1, 2,夏唐代1, 2,林存刚3,孟万斌4,吴昊5

(1. 浙江大学 建筑工程学院,浙江 杭州,310058;
2. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州,310058;
3. 宁波大学 建筑工程与环境学院,浙江 宁波,315211;
4. 杭州市地铁集团有限责任公司,浙江 杭州,310000;
5. 中南大学 地球科学与信息物理学院,湖南 长沙,410083
)

摘 要: 基于土力学基本原理,综合考虑覆土、盾构自重及未脱开管片自重、千斤顶反力因素等产生的阻滞力矩,推导出在软土地层中盾构施工反扭矩理论计算方法。通过杭州软土地区盾构地铁区间实例分析,发现理论计算反扭矩为实测切削扭矩18.9到16.0倍,表明在盾构切削施工过程中,反扭矩足够保证盾构正常掘进而不会有产生侧翻的可能。在盾构始发掘进时,虽然理论计算反扭矩大于实测切削扭矩,但是安全系数较小。提出一种简单有效防止侧翻的措施并应用于实践。由于软黏土的黏滞特性,在刀盘切削扭矩作用下盾构体轻微回转,通过反向调整切削方向可以消除盾构回转角。

 

关键字: 土压平衡盾构机;阻滞力矩;软土;隧道施工

Analysis of reverse torque of EPB shield tunneling in soft ground
LIANG Rongzhu1, 2, XIA Tangdai1, 2, LIN Cungang3, MENG Wanbin4, WU Hao5

1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;
2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
3. College of Civil, Construction and Environmental Engineering, Ningbo University, Ningbo 315211, China;
4. Hangzhou Metro Corporation Ltd., Hangzhou 310000, China;
5. School of Geosciences and Info-physics, Central South University, Changsha 410083, China

Abstract:Based on the principles of soil mechanics, a theoretical calculation method for computing the reverse torque of Earth Pressure Balanced shield driving in soft ground was derived by considering lots of relative factors, including the resistant moments induced by soft soil around shield body, the gravity of shield and segments left in shield, and the reaction force of jack thrust. The theoretical calculation method was verified through a case history of a metro tunnel section in Hangzhou soft ground. The reverse torques calculated by the proposed method are approximately 18.9 to 16 times of the measured cutting torques, which implies that the inherent reverse torque of shield can effectively prevent the shield from rolling during the advancing process. In the start stage, although the theoretical calculated reverse torques were still larger than the measured torques, they have low safe factors. A simple but effective method was proposed to prevent shield from rolling in the start stage in the improved ground. Its effectiveness was verified successfully in actual engineering practice. Due to the viscous of soft soils, slight rolling angles of shield body were observed when the cutter head was rotating in one single direction during the advancing process. The rolling angles can be effectively eliminated by adjusting the cutter head in the opposite direction.

 

Key words: EPB shield machine; resistance moment; soft ground; tunneling excavation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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