An active drainage method for groundwater environment protection and tunnel safety control

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-02-01 DOI:10.1016/j.trgeo.2025.101502

Ziquan Chen , Bingxin Yu , Zheng Li , Duanyang Zhuang , Maoyi Liu

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引用次数: 0

Abstract

The construction of tunnels in ecologically sensitive regions often seriously disturbs the balance of groundwater seepage fields. To control the stability of groundwater environment and consider the safety of tunnel structure, an active drainage method is proposed. Based on the Kexuecheng Tunnel in the mountainous city of Chongqing, China, theoretical calculations, numerical simulations and in-situ monitoring are applied to study the influence of the active drainage method on seepage and stress fields of small interval tunnels. The characteristics of tunnel groundwater discharge and water pressure under different drainage valve pressures and rainfall intensities are revealed, and the mechanical performance and safety factors of the tunnel lining are analyzed. The results indicate that the maximum shear stress and maximum tensile stress of the lining are located at the arch foot and bottom respectively, and increase with increasing groundwater level. Reducing the pressure of the drainage valve can increase the safety factor of the lining structure when excessive water pressure threatens the safety of tunnel structures. When the groundwater level drops too much, increasing the pressure of the drainage valve appropriately can reduce groundwater loss and help maintain the balance of the groundwater environment. In addition, the water pressure difference between the vault and bottom, as well as the water pressure asymmetry coefficient on the two sides of the tunnel, decrease with the increase of drainage valve pressure. Considering the tunnel water inflow, groundwater level change, water pressure and safety factors of lining, suitable drainage valve pressures are proposed for different rainfall intensities. An active drainage control system for tunnels in water-rich environment has been developed and applied, which can effectively achieve the dynamic balance between the groundwater level, water inflow and tunnel structural safety.

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.