盾构施工引起湿陷性黄土地层变形与沉降规律研究

发布时间：2018-06-03 20:09

本文选题：盾构法 + 湿陷性黄土　；参考：《河北工程大学》2014年硕士论文

【摘要】：21世纪以来，全球经济高速发展，带动城市化发展历程。世界人口的激增，导致资源空前紧张，城市地面交通面临巨大压力，随着科学技术进步，人类已逐渐掌握如何充分利用地下空间。地铁的出现，缓解了地面交通的压力，其安全、快速、舒适性，亦得到普通大众的接受。如今一个城市是否发达，往往可以从其是否建成通车地铁进行衡量。基于地铁的出现，给予人类便利快捷的生活，如何保证其安全性，，应是工程技术人员首要考虑的问题。目前国内研究地铁隧道施工在软土和粘土等中运用，已积累较多素材，但对西北部黄土地质研究相对较少，故本文着重阐述和研究盾构法在黄土地区中发展应用。以西部某城市地铁盾构施工项目为平台，运用盾构施工基本理论，结合黄土湿陷性等特性，通过数值建模与现场实测等方法，研究湿陷性黄土地区盾构施工引起地层变形与沉降的相关规律；分析黄土性质对地层及开挖面附近的建筑物沉降变形的影响；运用Peck公式预估地层变形，分析研究地层沉降现有监测数据，通过线性回归和最小二乘法求出Peck公式地层土体损失率及沉降槽宽度变化范围，并对其进行适当的修正，使能较好的预测黄土地区隧道盾构施工引起地层变形与沉降规律。通过建立FLAC3D数值模型模拟预测隧道盾构施引起地层建筑物变形的相关规律，通过对计算结果的对比分析，得出采用何种加固措施能更好的控制地层沉降和变形；通过对黄土性质的数值模拟分析，得出黄土内摩擦角、黏聚力对地层沉降和变形的影响。设计地层沉降及建筑物基础变形监测方案，完成现场检测，将现场检测结果与计算结果相比较，观察隧道施工影响范围内地层沉降实测值与数值模拟计算值的变化趋势，检测FLAC3D模拟计算结果的准确度，得出FLAC3D数值计算用于预测地层沉降的可行性。
[Abstract]:Since the 21 st century, the global economy has developed at a high speed, driving the development of urbanization. With the development of science and technology, human beings have gradually grasped how to make full use of underground space. The emergence of subway alleviates the pressure of ground transportation, and its safety, speed and comfort are accepted by the general public. Nowadays, whether a city is developed or not is often measured by whether it is built and opened to subway. Based on the appearance of subway, how to guarantee the safety of subway is the most important problem for engineers and technicians to consider. At present, the domestic research on the application of subway tunnel construction in soft soil and clay has accumulated a lot of materials, but the research on loess geology in northwest China is relatively few. Therefore, this paper mainly expounds and studies the development and application of shield method in loess area. Taking the shield construction project of a city in the west of China as the platform, applying the basic theory of shield construction and combining the characteristics of loess collapsibility, the method of numerical modeling and field measurement is adopted. This paper studies the correlation law of stratum deformation and settlement caused by shield tunneling in collapsible loess area, analyzes the influence of loess property on subsidence deformation of stratum and building near excavating surface, uses Peck formula to estimate stratum deformation, The existing monitoring data of stratum settlement are analyzed and studied. The range of soil loss rate and width of settlement trough of Peck formula is obtained by linear regression and least square method, and the appropriate correction is made. It is possible to predict the deformation and settlement law of stratum caused by shield tunneling in loess area. Through the establishment of FLAC3D numerical model to predict the correlation law of tunnel shield tunneling caused by stratum building deformation, through the comparison and analysis of the calculation results, it is concluded that what reinforcement measures can be used to better control the formation settlement and deformation; Through numerical simulation and analysis of loess properties, the influence of internal friction angle and cohesion on stratum settlement and deformation is obtained. The monitoring scheme of ground settlement and deformation of building foundation is designed, and the field detection is completed. The result of field detection is compared with the calculated result, and the variation trend of ground settlement measured value and numerical simulation calculation value in the influence area of tunnel construction is observed. The accuracy of FLAC3D simulation results is tested, and the feasibility of FLAC3D numerical calculation for predicting ground subsidence is obtained.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43

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