水下盾构隧道的合理覆土厚度数值模拟分析
发布时间：2019-05-11 18:40
【摘要】：针对水下隧道长期赋存于富水环境中,围岩的力学性质较差,地层的成拱能力降低的特点,研究水下盾构隧道的合理覆土厚度,为设计与施工提供参考。在国内外学者研究成果的基础上,依托具体的工程实例,鉴于实际施工中盾尾管片壁后注浆对盾构隧道的动态上浮作用和对地层沉降的影响,进而确定对盾构隧道最小覆土厚度的影响,同时基于水下隧道突水风险研究,综合考虑水、土、注浆浆液的动态影响,通过对颗粒流数值模拟结果进行分析,给出水下盾构隧道合理覆土厚度和最小覆土厚度临界值的判定依据和条件,采取必要的信息化施工和响应联动措施,控制水下盾构隧道浅覆土穿越水体地层变位,保证工程和环境的安全。研究结果表明:双洞隧道的地表沉降曲线基本符合Peck沉降槽理论,随着埋深的增加,地表沉降将由2个独立的沉降槽逐渐发展叠加为1个新的沉降槽;对于依托工程而言,隧道覆土厚度的临界值为1.3D;围岩的竖向位移随距隧道中心线距离的增大而减小,当距离增大到0.5D后位移变化不再显著;隧道开挖后,由于隧道顶部土体拱效应的发挥,不同埋深情况下作用在管片上的土压力将明显小于初始土压力,且压力值与埋深成正比。
[Abstract]:In view of the fact that the underwater tunnel exists in the water-rich environment for a long time, the mechanical properties of the surrounding rock are poor and the arch forming ability of the strata is reduced, the reasonable overlying soil thickness of the underwater shield tunnel is studied, which provides a reference for the design and construction of the underwater shield tunnel. On the basis of the research results of scholars at home and abroad, relying on specific engineering examples, in view of the dynamic floating effect of shield tail pipe wall grouting on shield tunnel and the influence on formation settlement in actual construction, Then the influence on the minimum overlying soil thickness of shield tunnel is determined. at the same time, based on the study of water inrush risk of underwater tunnel, the dynamic influence of water, soil and grouting slurry is considered comprehensively, and the numerical simulation results of particle flow are analyzed. The determination basis and conditions of the reasonable overlying soil thickness and the minimum overlying soil thickness of the underwater shield tunnel are given, and the necessary information construction and response linkage measures are taken to control the displacement of the shallow overlying soil of the underwater shield tunnel through the water layer. Ensure the safety of engineering and environment. The results show that the surface subsidence curve of the double-hole tunnel basically accords with the Peck subsidence trough theory. With the increase of the buried depth, the surface subsidence will be gradually developed and superimposed from two independent subsidence grooves to a new settlement trough. For the relying project, the critical value of tunnel overlying soil thickness is 1.3D, and the vertical displacement of surrounding rock decreases with the increase of the distance from the center line of the tunnel, and the displacement changes no longer significant when the distance increases to 0.5D. After tunnel excavation, due to the arch effect of soil at the top of the tunnel, the earth pressure acting on the segment under different buried depths will be obviously smaller than the initial earth pressure, and the pressure value will be proportional to the buried depth.
【作者单位】： 清华大学土木工程安全与耐久教育部重点实验室;北京交通大学城市地下工程教育部重点实验室;北京市政建设集团有限责任公司;北京市市政四建设工程有限责任公司;
【基金】：国家重大研发计划项目(2017YFC0805008)
【分类号】：U455.43;U459.5
本文编号：2474756
[Abstract]:In view of the fact that the underwater tunnel exists in the water-rich environment for a long time, the mechanical properties of the surrounding rock are poor and the arch forming ability of the strata is reduced, the reasonable overlying soil thickness of the underwater shield tunnel is studied, which provides a reference for the design and construction of the underwater shield tunnel. On the basis of the research results of scholars at home and abroad, relying on specific engineering examples, in view of the dynamic floating effect of shield tail pipe wall grouting on shield tunnel and the influence on formation settlement in actual construction, Then the influence on the minimum overlying soil thickness of shield tunnel is determined. at the same time, based on the study of water inrush risk of underwater tunnel, the dynamic influence of water, soil and grouting slurry is considered comprehensively, and the numerical simulation results of particle flow are analyzed. The determination basis and conditions of the reasonable overlying soil thickness and the minimum overlying soil thickness of the underwater shield tunnel are given, and the necessary information construction and response linkage measures are taken to control the displacement of the shallow overlying soil of the underwater shield tunnel through the water layer. Ensure the safety of engineering and environment. The results show that the surface subsidence curve of the double-hole tunnel basically accords with the Peck subsidence trough theory. With the increase of the buried depth, the surface subsidence will be gradually developed and superimposed from two independent subsidence grooves to a new settlement trough. For the relying project, the critical value of tunnel overlying soil thickness is 1.3D, and the vertical displacement of surrounding rock decreases with the increase of the distance from the center line of the tunnel, and the displacement changes no longer significant when the distance increases to 0.5D. After tunnel excavation, due to the arch effect of soil at the top of the tunnel, the earth pressure acting on the segment under different buried depths will be obviously smaller than the initial earth pressure, and the pressure value will be proportional to the buried depth.
【作者单位】： 清华大学土木工程安全与耐久教育部重点实验室;北京交通大学城市地下工程教育部重点实验室;北京市政建设集团有限责任公司;北京市市政四建设工程有限责任公司;
【基金】：国家重大研发计划项目(2017YFC0805008)
【分类号】：U455.43;U459.5
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