管幕结构因能有效控制地层扰动而常被用于下穿铁路、地铁等敏感工程,群管在顶进过程中,因受土层参数、掘进参数等影响而发生偏差,若偏差过大将影响管幕结构支护效果.依托某换乘通道工程,实时记录了钢管顶进过程中的姿态变化,研究了顶进管道的偏差以及不同断面处管节的闭合姿态.研究表明:1)77.2%钢管偏差在40 mm(钢管直径的5%)及以内,且锁口在垂直于管幕群的方向约束效应更强.随着顶进距离的增大,锁口的约束效应会减弱;2)刚性连接钢管穿越洞口和中段MJS加固区时,表现出明显的刚度效应,积累较大偏差,约70%的顶管出现右偏趋势;3)在顶管的前段整体姿态有波动但仍保持平稳;中段偏差逐渐放大,但最大值控制在65 mm以内,靠近接收井处下排管幕群经过纠偏已经基本归位(竖向偏差均控制在40 mm以内,76.9%钢管水平偏差控制在40 mm以内),上排管幕群偏差平均值在40 mm以内.
Pipe-roof structures are frequently utilized in sensitive projects, such as those involving underpasses beneath existing railways and subways, due to their effectiveness in controlling ground disturbance. During the jacking process of pipe-roof installation, deviations may occur due to soil parameters and construction parameters. Excessive deviations can compromise the supporting efficacy of the pipe-roof structure. However, there exists a relative paucity of research specifically addressing deviations during pipe-roof jacking. Based on the transfer passage project, this paper records in real-time the attitude changes during the jacking process of steel pipes, and studies the deviation of the jacked pipeline as well as the closure attitude of pipe sections at different cross-sections. The findings are summarized- DOI:10.3969/j.issn.1000-1565.2025.03.002长距离管幕群顶进管道偏差及闭合姿态分析张晨浩1,陈思明2,罗嵩2,关振长3,黄金峰2,贾鹏蛟1(1.苏州大学 轨道交通学院,江苏 苏州 215137;2.中铁南方投资集团有限公司,广东 深圳 518052;3.福州大学 土木工程学院,福建 福州 350108)摘 要:管幕结构因能有效控制地层扰动而常被用于下穿铁路、地铁等敏感工程,群管在顶进过程中,因受土层参数、掘进参数等影响而发生偏差,若偏差过大将影响管幕结构支护效果.依托某换乘通道工程,实时记录了钢管顶进过程中的姿态变化,研究了顶进管道的偏差以及不同断面处管节的闭合姿态.研究表明:1)77.2%钢管偏差在40 mm(钢管直径的5%)及以内,且锁口在垂直于管幕群的方向约束效应更强.随着顶进距离的增大,锁口的约束效应会减弱;2)刚性连接钢管穿越洞口和中段MJS加固区时,表现出明显的刚度效应,积累较大偏差,约70%的顶管出现右偏趋势;3)在顶管的前段整体姿态有波动但仍保持平稳;中段偏差逐渐放大,但最大值控制在65 mm以内,靠近接收井处下排管幕群经过纠偏已经基本归位(竖向偏差均控制在40 mm以内,76.9%钢管水平偏差控制在40 mm以内),上排管幕群偏差平均值在40 mm以内.关键词:管幕;偏差;闭合姿态;约束效应;刚度效应中图分类号:TU447 文献标志码:A 文章编号:1000-1565(2025)03-0235-09Long-distance pipe-roof group jacking pipeline deviation and closure attitude analysisZHANG Chenhao1, CHEN Siming2, LUO Song2, GUAN Zhenchang3, HUANG Jinfeng2, JIA Pengjiao1(1. College of Rail Transportation, Soochow University, Suzhou 215137, China; 2. China Railway South Investment Group Co., Ltd., Shenzhen 518052, China; 3. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China)Abstract: Pipe-roof structures are frequently utilized in sensitive projects, such as those involving underpasses beneath existing railways and subways, due to their effectiveness in controlling ground disturbance. During the jacking process of pipe-roof installation, deviations may occur due to soil parameters and construction parameters. Excessive deviations can compromise the supporting efficacy of the pipe-roof structure. However, there exists a relative paucity of research specifically addressing deviations during pipe-roof jacking. Based on the transfer passage project, this paper records in real-time the attitude changes during the jacking process of steel pipes, and studies the deviation of the jacked pipeline as well as the closure attitude of pipe sections at different cross-sections. The findings are summarized- 收稿日期:2024-09-02;修回日期:2024-11-29 基金项目:国家自然科学基金资助项目(52108380) 第一作者:张晨浩(2001—),男,苏州大学在读硕士研究生,主要从事隧道工程方向研究.E-mail:chzhang616@stu.suda.edu.cn 通信作者:贾鹏蛟(1989—),男,苏州大学副教授,主要从事岩土与隧道工程方向研究.E-mail:pjjia@suda.edu.cn 第3期张晨浩等:长距离管幕群顶进管道偏差及闭合姿态分析河北大学学报(自然科学版) 第45卷as follows: 1)The majority(77.2%)of steel pipe deviations are confined within 40 mm(5% of the pipes diameter), indicating a high degree of precision. Furthermore, the locking mechanism exerts a more pronounced restraining effect in the direction perpendicular to the pipe-roof alignment. However, as the jacking distance increases, the constraining influence of the locking mechanism decreases. 2)When rigidly connected steel pipes pass through the tunnel opening and the middle section MJS reinforcement area, they exhibit a significant stiffness effect, accumulating a large deviation, with approximately 70% of the pipe jacking showing a rightward deviation trend. 3)In the initial section of the jacking process, although there are fluctuations in the overall attitude, it remains stable. In the middle section, the deviations within the pipe-roof gradually increase, but the maximum deviation is controlled within 65 mm. The lower pipe-roof group near the receiving shaft has been basically realigned after correction. The vertical deviation is controlled within 40 mm, and 76.9% of the steel pipes have horizontal deviations within 40 mm. The average deviation of the upper pipe-roof group is within 40 mm.
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