大跨浅埋软基隧道下穿高速公路力学行为与施工技术研究
发布时间：2019-05-12 20:04
【摘要】：我国城市隧道建设不断面临浅埋、大跨度、围岩软弱、富水地层、下穿建(构)筑物等复杂环境施工难点,极易引发坍塌、支护侵限、地表沉降过大、建(构)筑物倾斜和发生受力破坏等工程灾害。本文依托在建的红棉路隧道下穿机荷高速公路段施工背景,采用文献调研、数值计算、理论分析、室内试验和现场量测等手段,系统地研究了大跨浅埋软基隧道长距离下穿高速公路的施工工法及技术措施等主要关键问题。主要研究内容及成果如下： (1)采用数值计算方法对双侧壁导坑优化工法与传统双侧壁导坑法进行对比,指出先行位移和挤出位移较大是施工中隧道较大变形的重要原因,研究了掌子面封闭对变形的控制效果,并与实测结果进行对照。综合施工循环长度及交通疏解要求和位移控制两方面,分析了双侧壁导坑优化工法在红棉路隧道下穿机荷高速公路段更具优越性。 (2)基于Winkler弹性地基梁理论建立管棚超前支护和锁脚锚杆的力学模型,提出两者对支护结构竖向荷载的承载作用计算方法,并在此基础上建立双侧壁导坑优化工法分部开挖拱脚荷载的计算模型与方法,并对依托工程进行实例计算与分析。指出隧道开挖中存在基底承载力不足的问题,易导致较大整体沉降,并对拱脚下沉的原因及其控制措施进行较为系统的总结。 (3)结合依托工程的实际地质条件,通过室内试验揭示了不同含水量下富水软土的强度特性,并基于试验结果研究了土体饱和度对软土承载力的影响,进行了地基含水量对隧道变形和施工安全性影响的计算分析,据此提出了现场地下水的具体处置措施。 (4)采用现场监控量测方法,对双侧壁导坑优化工法施工过程中地表沉降和隧道的受力情况进行跟踪反馈,及时了解施工方法和措施的安全性、可靠性。量测结果表明双侧壁导坑优化工法配合所提出的系列技术控制措施能够保证红棉路隧道安全下穿机荷高速公路。
[Abstract]:The construction of urban tunnels in China is faced with complex environmental construction difficulties, such as shallow burying, long span, weak surrounding rock, rich water strata, underpass structures and other complex environmental construction difficulties, which can easily lead to collapse, support invasion limit and excessive surface subsidence. Engineering disasters such as building tilt and stress failure. Based on the construction background of the tunnel under construction, this paper adopts the means of literature investigation, numerical calculation, theoretical analysis, laboratory test and field measurement. In this paper, the construction methods and technical measures of long-distance highway crossing in long-distance shallow soft foundation tunnel are systematically studied. The main research contents and achievements are as follows: (1) the optimization method of bilateral wall guide pit is compared with the traditional double wall guide pit method by numerical calculation method. It is pointed out that the large advance displacement and extrusion displacement are the important reasons for the large deformation of the tunnel in construction. The control effect of palm surface closure on deformation is studied and compared with the measured results. Based on the two aspects of construction cycle length, traffic thinning requirements and displacement control, this paper analyzes that the optimization method of double side wall guide pit is more superior in the section of machine-load expressway under cotton road tunnel. (2) based on Winkler elastic foundation beam theory, the mechanical models of pipe shed advance support and locking anchor rod are established, and the calculation method of vertical load of supporting structure is put forward. On this basis, the calculation model and method of arch foot load in partial excavation of double side wall guide pit optimization method are established, and an example is calculated and analyzed. It is pointed out that there is a problem of insufficient bearing capacity of foundation in tunnel excavation, which is easy to lead to large overall settlement, and the causes of arch foot subsidence and its control measures are systematically summarized. (3) combined with the actual geological conditions of the project, the strength characteristics of water-rich soft soil under different water content are revealed through laboratory tests, and the influence of soil saturation on the bearing capacity of soft soil is studied based on the test results. The influence of ground water content on tunnel deformation and construction safety is calculated and analyzed. Based on this, the concrete disposal measures of ground water in the field are put forward. (4) the field monitoring and measurement method is used to track and feedback the surface settlement and tunnel force during the construction of double side wall guide pit optimization method, so as to understand the safety and reliability of the construction methods and measures in time. The measurement results show that the series of technical control measures proposed by the double side wall guide pit optimization method can ensure the safety of the red cotton road tunnel under the machine-load highway.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4
本文编号：2475665
[Abstract]:The construction of urban tunnels in China is faced with complex environmental construction difficulties, such as shallow burying, long span, weak surrounding rock, rich water strata, underpass structures and other complex environmental construction difficulties, which can easily lead to collapse, support invasion limit and excessive surface subsidence. Engineering disasters such as building tilt and stress failure. Based on the construction background of the tunnel under construction, this paper adopts the means of literature investigation, numerical calculation, theoretical analysis, laboratory test and field measurement. In this paper, the construction methods and technical measures of long-distance highway crossing in long-distance shallow soft foundation tunnel are systematically studied. The main research contents and achievements are as follows: (1) the optimization method of bilateral wall guide pit is compared with the traditional double wall guide pit method by numerical calculation method. It is pointed out that the large advance displacement and extrusion displacement are the important reasons for the large deformation of the tunnel in construction. The control effect of palm surface closure on deformation is studied and compared with the measured results. Based on the two aspects of construction cycle length, traffic thinning requirements and displacement control, this paper analyzes that the optimization method of double side wall guide pit is more superior in the section of machine-load expressway under cotton road tunnel. (2) based on Winkler elastic foundation beam theory, the mechanical models of pipe shed advance support and locking anchor rod are established, and the calculation method of vertical load of supporting structure is put forward. On this basis, the calculation model and method of arch foot load in partial excavation of double side wall guide pit optimization method are established, and an example is calculated and analyzed. It is pointed out that there is a problem of insufficient bearing capacity of foundation in tunnel excavation, which is easy to lead to large overall settlement, and the causes of arch foot subsidence and its control measures are systematically summarized. (3) combined with the actual geological conditions of the project, the strength characteristics of water-rich soft soil under different water content are revealed through laboratory tests, and the influence of soil saturation on the bearing capacity of soft soil is studied based on the test results. The influence of ground water content on tunnel deformation and construction safety is calculated and analyzed. Based on this, the concrete disposal measures of ground water in the field are put forward. (4) the field monitoring and measurement method is used to track and feedback the surface settlement and tunnel force during the construction of double side wall guide pit optimization method, so as to understand the safety and reliability of the construction methods and measures in time. The measurement results show that the series of technical control measures proposed by the double side wall guide pit optimization method can ensure the safety of the red cotton road tunnel under the machine-load highway.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4
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