Field experiment and numerical simulation on sequence dewatering of a sand inrush tunnel under high water pressure in semi-diagenetic rock: a case study

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2025-05-17 DOI:10.1007/s12665-025-12245-w

Jianxiu Wang, Qianyuan Zhang, Minlin Lei, Jinsong Xu, Hua Lei, Ansheng Cao, Yanxia Long

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引用次数: 0

Abstract

The semi-diagenetic sandstone stratum has the characteristics of weak cementation and low strength. Gushing induced sand inrush in semi-diagenetic surrounding rock under high water pressure is one of the most difficult worldwide disasters during tunnelling. In the construction of Wangjiazhai Tunnel in Lincang-Qingshuihe expressway, gushing and sand inrush disasters in semi-diagenetic surrounding rock occurred numerous times under high water pressure causing serious economic loss, environment influence and construction delay. Conventional grouting reinforcement and drainage measures in tunnel cannot effectively solved the disaster problem resulting in repeated gushing and sand inrush, rescue and re-excavation without confidence construction period. In order to solve the surge and sand inrush disaster problem of the tunnel, this study proposed a surface ultra-deep pumping well dewatering method. The pumping well exceeding 250 m deep was designed and sequentially pumping scheme was adopted adapted to the progress of the excavation face. Three deep wells were successfully installed, and pumping experiments was carried out which inversed hydraulic parameters and confirmed the feasibility of well structure. The pumping capacity of these wells exceeding 700 m³/d and a maximum drawdown of 70 m. Based on the field experiments, a sequential dynamic dewatering scheme was proposed. The sequential dynamic dewatering scheme was verified by numerical simulation. The results show that this scheme can reduce the groundwater level above the tunnel by more than 50 m and effectively reduce the groundwater level in front of the tunnel excavation face. The design ideas and results of this study provide a reliable solution for the control of tunnel surge and sand inrush disasters under similar challenges.

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半成岩高压下冲砂隧洞序贯脱水的现场试验与数值模拟

半成岩砂岩地层具有胶结性弱、强度低的特点。高水压下半成岩围岩涌沙是世界范围内隧洞施工中最困难的灾害之一。临沧-清水高速公路王家寨隧道施工中，在高压下多次发生半成岩围岩涌沙灾害，造成了严重的经济损失、环境影响和施工延误。隧道常规注浆加固排水措施不能有效解决隧洞反复涌沙、抢险、再开挖等灾害问题，施工周期不确定。为解决隧道涌沙灾害问题，提出了一种地表超深井降水方法。设计了深度超过250 m的抽井，采用了适应开挖工作面进度的顺序抽井方案。成功安装了3口深井，并进行了抽水试验，反演了水力参数，验证了井结构的可行性。这些井的抽水能力超过700立方米/天，最大下沉70米。在现场试验的基础上，提出了一种顺序动态脱水方案。通过数值模拟对顺序动态脱水方案进行了验证。结果表明，该方案可使隧道上方地下水位降低50 m以上，并有效降低隧道开挖工作面前方地下水位。本文的设计思想和研究成果为类似条件下隧道涌沙灾害的治理提供了可靠的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.