急曲线隧道盾构超挖量及铰接角的理论算法

发布时间：2018-05-06 03:01

  本文选题：盾构隧道 + 曲线开挖　； 参考：《中国公路学报》2017年08期

【摘要】：为提高盾构机开挖急曲线隧道的能力,应准确预估超挖刀的伸出长度与范围、铰接角等几何作业参数。目前上述参数仅基于盾构与隧道设计轴线的平面几何关系确定,无法适应三维复合曲线隧道的施工要求。基于空间向量分析理论,提出三维复合曲线隧道超挖刀长度与范围、铰接角的理论算法,并基于Fortran语言实现算法的求解。对实际隧道工程盾构的几何作业参数进行了模拟,通过模拟值与实测数据的对比,验证了理论算法的有效性。结果表明:铰接角的实测值与模拟值整体拟合较好,当盾构机在曲线段掘进时,铰接角的实测值略大于模拟值,是由于实际施工中以刀盘的中心点拟合隧道设计轴线为纠偏目标,与理论算法中以管片拼装中心点拟合隧道轴线的理想掘进状态存在差异;模拟的超挖刀范围窄于实测范围,而超挖刀伸出长度的模拟值比实测值略大,存在的微小差异来自于理论算法假定盾构机不挤压地层且周围地层不变形,而实际施工中地层存在一定的变形量。
[Abstract]:In order to improve the ability of shield machine to excavate sharp curve tunnel, it is necessary to accurately predict the geometric operation parameters such as the length and range of overdigging knife, hinge angle and so on. At present, the above parameters are only determined on the basis of the plane geometry relation between shield tunneling and tunnel design axis, and can not meet the construction requirements of 3D composite curve tunnel. Based on the theory of space vector analysis, this paper presents a theoretical algorithm for the length, range and hinge angle of three dimensional composite curve tunnel overcut cutter. The algorithm is solved based on Fortran language. The geometric operating parameters of shield tunneling in actual tunnel engineering are simulated. The validity of the theoretical algorithm is verified by comparing the simulated data with the measured data. The results show that the measured value of hinge angle fits well with the simulated value as a whole, and the measured value of hinge angle is slightly larger than the simulated value when the shield machine is driving in the curve section. It is due to the fact that the center point of the cutter head fitting the design axis of the tunnel is taken as the rectifying target in the actual construction, which is different from the ideal tunneling state of fitting the tunnel axis with the central point of the segment assembly in the theoretical algorithm, and the range of the simulated over-digging knife is narrower than the measured range. However, the simulation value of the outstretched length of the overdug knife is slightly larger than the measured value, and the slight difference lies in the assumption that the shield machine does not squeeze the stratum and the surrounding stratum does not deform, but there is a certain amount of deformation in the actual construction.
【作者单位】： 哈尔滨工业大学结构工程灾变与控制教育部重点实验室;哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室;
【基金】：国家自然科学基金项目(51478146) 国家重点基础研究发展计划(“九七三”计划)项目(2015CB057800)
【分类号】：U455.43
，

本文编号：1850471