渗透性地层中隧道施工引起的地表沉降——以深圳地铁为例（英文）

发布时间：2018-06-15 00:20

本文选题：地表沉降 + 浅埋暗挖法　；参考：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年10期

【摘要】：目的:在城市地铁的建设过程中,地下水渗流对地表沉降存在较大影响。然而,渗透性地层中浅埋暗挖法施工的案例报道较少,地表沉降规律尚不明晰。本文以深圳地铁5号线和7号线重叠段工程为例,详细分析在渗流作用下浅埋暗挖法施工引起的地表沉降特征以及小导管注浆区和初支衬砌渗透性对地表沉降的影响,并进一步研究超前排水措施在沉降控制方面的作用。创新点:1.系统分析了富水渗透性地层中浅埋暗挖隧道施工引起的地表沉降的发展过程以及沉降特征;2.验证了三维流固耦合数值模型模拟富水环境下重叠隧道施工过程的可行性;3.研究了小导管注浆区、初支衬砌的渗透性和超前排水措施对地表沉降的影响。方法:1.结合隧道施工方案和地表沉降监测数据,分析渗流作用下的地表沉降特征(包括沉降影响范围、沉降槽宽度以及与拱顶沉降的关系等);2.通过三维流固耦合数值模型,研究小导管注浆区和初支衬砌渗透性对地表沉降以及地层孔压变化过程的影响;3.通过模拟掌子面前方水平排水孔,研究超前排水措施对掌子面稳定性和地表沉降发展的影响。结论:1.对于渗透性地层中的浅埋暗挖隧道工程,地下水渗流引起的固结效应是地表沉降量以及沉降范围大幅增长的主要原因。2.全断面注浆能够很好地控制地表沉降,而小导管注浆的效果则十分有限。3.降低小导管注浆区的渗透性,尤其是初支衬砌的渗透性,可以减少地层孔压的下降程度,进而降低地表沉降。4.打设超前水平排水孔可以显著提高掌子面稳定性,却对地表沉降影响有限;当无法进行全断面注浆时,推荐采取小导管注浆与超前排水相结合的方式施工。
[Abstract]:Objective: in the construction process of urban subway, groundwater seepage has a great influence on the surface subsidence. However, the case of shallow buried excavation method in seepage stratum is less reported and the law of surface subsidence is not clear. This paper, taking Shenzhen Metro Line 5 and 7 line overlap section project as an example, analyzes in detail shallow buried excavation method under seepage action. The characteristics of ground subsidence caused by work and the influence of the permeability of small pipe grouting area and initial lining on the surface subsidence, and further study the effect of the advance drainage measures on settlement control. Innovation point: 1. the development process and settlement characteristics of surface subsidence caused by shallow buried tunnel construction in the water permeable permeability stratum are analyzed. 2. verify the feasibility of the three-dimensional fluid solid coupling numerical model to simulate the construction process of overlapping tunnels in the water rich environment. 3. the influence of the permeability of the initial lining and the advance drainage measures on the surface subsidence is studied. Method: 1. combined with the tunnel construction scheme and the surface subsidence monitoring data, the surface settlement under the seepage flow is analyzed. The characteristics (including the range of settlement, the width of settlement trough and the relationship with the settlement of the vault); 2. through the three-dimensional fluid solid coupling numerical model, the influence of the permeability of the grouting zone and the initial lining on the surface settlement and the change of the pore pressure is studied. 3. through the simulation of the horizontal drainage holes ahead of the front of the palmar surface, the advanced drainage measures are studied. The effect of subsurface stability and surface subsidence development. 1. for shallow buried tunnel in permeable strata, the consolidation effect caused by groundwater seepage is the main reason for the large increase of surface settlement and settlement range,.2. full section grouting can control surface subsidence well, and the effect of small pipe grouting is very good. Reducing the permeability of the small catheter grouting area by limiting.3., especially the permeability of the initial lining, can reduce the decrease of the pore pressure, and then reduce the surface settlement.4. to set the advanced horizontal drainage holes, which can significantly improve the stability of the surface of the palm, but it has a limited influence on the surface subsidence. The slurry is constructed in combination with the advanced drainage.
【作者单位】： Research
【基金】：Project supported by the National Natural Science Foundation of China(No.51508503) the Fund of the China Scholarship Council(No.201406320025) the Research Plan of the Academician Workstation of Guangzhou Chemical Grouting Co.Ltd.,China Academy of Science(No.2016GZZ01)
【分类号】：P642.26;U231;U456.3

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