高内水压力下盾构输水隧道双层衬砌预应力规程研究

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2024-10-21 DOI:10.1016/j.tust.2024.106133

Shimin Wang , Xiaobin Ma , Ya Wang , Chang Liu

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引用次数: 0

摘要

盾构隧道预应力双层衬砌（分段衬砌和预应力衬砌）具有良好的抗渗性和较强的稳定性，是一种新型支护结构，在高内压输水工程中具有很大的应用潜力。对于预应力输水隧洞工程而言，衬砌张拉预应力的合理取值是工程经济性和安全性的关键。因此，以珠江三角洲水资源配置工程为依托，设计了类似成缆张拉工况（CCTC）和设计水压工况（DWPC）下的输水盾构隧道预应力双层衬砌模型试验，并建立了相应的ABAQUS三维有限元模型，研究了不同预应力工况下双层衬砌结构的力学特性变化。研究确定了内衬在 1.5 兆帕设计内水压下的合理预应力范围。结果表明，在 CCTC 条件下，预应力衬砌全环受压，分段衬砌的整体位移水平低于预应力衬砌，双层衬砌接触面有脱离趋势，随着结构预应力的增加，预应力衬砌混凝土的受压破坏逐渐发展。在 DWPC 条件下，双层衬砌接触面在内部水压的作用下完全封闭，预应力衬砌混凝土的开裂风险随着预应力的减小而增大。通过数值模拟，盾构隧道衬砌预应力力的合理范围为 68%σcon ～ 137%σcon，其结果可为类似盾构输水隧道预应力双层衬砌结构的设计与施工提供参考。

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Research on the prestress Regulation of double-layer lining of shield water tunnel under high internal water pressure

Prestressed double-layer lining (segmental lining and prestressed lining) of shield tunnels has good seepage resistance and strong stability, and is a new type of support structure with great potential in high internal water pressure water transmission projects. For prestressed water conveyance tunnel projects, the reasonable value of lining tensioning prestress is the key to the economy and safety of the project. Accordingly, relying on the Pearl River Delta Water Resources Allocation Project, designed similar model tests for prestressed double-layer lining of water conveyance shield tunnels under the completed cable tension condition (CCTC) and design water pressure condition (DWPC) and established the corresponding ABAQUS three-dimensional finite element model to investigate the variations in the mechanical characteristics of the double-layer lining structure under different prestress conditions. The study determined the reasonable prestress range for the inner lining under a design internal water pressure of 1.5 MPa. The results indicated that under the CCTC, the prestressed lining is pressurized in the whole ring, the overall displacement level of the segmental lining is lower than that of the prestressed lining, the double-layer lining contact surface has a tendency to be detached, and with the increase of the structural prestress, the pressurized damage of the prestressed lining concrete develops gradually. Under the DWPC, the double-layer lining contact surface is completely closed under the action of internal water pressure, and the cracking risk of prestressed lining concrete increases with the decrease of prestress. Through numerical simulation, the reasonable range of prestressing force for shield tunnel lining is 68 %σ_con ∼ 137 %σ_con, and the results can provide a reference for the design and construction of prestressed double-layer lining structures of similar shield water tunnels.

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.