变换局部荷载边界条件下自由变形法的内力计算式及对比
发布时间：2019-04-12 16:29
【摘要】：摘要：杭州地铁1号线由于浅层沼气的存在,使得运营阶段隧道衬砌在承受地层压力的同时还可能承受到冲击荷载,如高压浅层气的突出、爆炸等情况。本文以杭州地铁1号线、西安地铁2号线、狮子洋盾构隧道、广州地铁2号线为背景,对变换局部荷载边界条件下自由变形法理论解的修正和冲击荷载下衬砌最大内力的理论解做了较为系统的研究,其主要研究内容如下： (1)对自由变形法和日本三角形反力法的内力计算公式做了理论推导,明确了推导过程与推导思路,为冲击荷载下衬砌瞬时最大内力的理论式推导提供了理论基础； (2)在各工程实例的计算对比中,自由变形法的优势在于计算简便快速。自由变形法适用于软土地层,导致自由变形法计算偏差的最大原因是侧向压力的理论计算值与实际值差别过大。在侧压力系数较低的土层中应用自由变形法时,可以通过修正侧压力系数的方法对其计算结果做出修正,提高其计算精度和适用范围。 (3)以自由变形法为理论基础,推导出了冲击荷载下衬砌最大内力的理论计算式与时程内力计算式,并与试验结果进行了计算对比。
[Abstract]:Abstract: due to the existence of shallow biogas in Hangzhou Metro Line 1, the tunnel lining may bear the impact load at the same time as the formation pressure, such as the protruding of high pressure shallow gas, explosion and so on. The background of this paper is Hangzhou Metro Line 1, Xi'an Metro Line 2, Lion Ocean Shield Tunnel and Guangzhou Metro Line 2. The theoretical solution of free deformation method under the boundary condition of local load transformation and the theoretical solution of maximum internal force of lining under impact load are systematically studied. The main research contents are as follows: (1) the internal force calculation formulas of the free deformation method and the Japanese triangle reaction method are deduced theoretically, and the derivation process and thinking are clarified. It provides a theoretical basis for the theoretical derivation of the instantaneous maximum internal force of the lining under impact load. (2) in the comparison of engineering examples, the advantage of free deformation method is that the calculation is simple and fast. The free deformation method is suitable for soft soil formation. The biggest reason for the deviation of free deformation method is that the theoretical value of lateral pressure is too different from the actual value. When the free deformation method is applied in the soil layer with low lateral pressure coefficient, the calculation results can be modified by modifying the lateral pressure coefficient, and the calculation precision and applicable range can be improved. (3) based on the free deformation method, the theoretical calculation formula and the time-history internal force formula for the maximum internal force of the lining under impact load are derived and compared with the experimental results.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231;U455.43
本文编号：2457180
[Abstract]:Abstract: due to the existence of shallow biogas in Hangzhou Metro Line 1, the tunnel lining may bear the impact load at the same time as the formation pressure, such as the protruding of high pressure shallow gas, explosion and so on. The background of this paper is Hangzhou Metro Line 1, Xi'an Metro Line 2, Lion Ocean Shield Tunnel and Guangzhou Metro Line 2. The theoretical solution of free deformation method under the boundary condition of local load transformation and the theoretical solution of maximum internal force of lining under impact load are systematically studied. The main research contents are as follows: (1) the internal force calculation formulas of the free deformation method and the Japanese triangle reaction method are deduced theoretically, and the derivation process and thinking are clarified. It provides a theoretical basis for the theoretical derivation of the instantaneous maximum internal force of the lining under impact load. (2) in the comparison of engineering examples, the advantage of free deformation method is that the calculation is simple and fast. The free deformation method is suitable for soft soil formation. The biggest reason for the deviation of free deformation method is that the theoretical value of lateral pressure is too different from the actual value. When the free deformation method is applied in the soil layer with low lateral pressure coefficient, the calculation results can be modified by modifying the lateral pressure coefficient, and the calculation precision and applicable range can be improved. (3) based on the free deformation method, the theoretical calculation formula and the time-history internal force formula for the maximum internal force of the lining under impact load are derived and compared with the experimental results.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231;U455.43
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