Analysis of the impact of groundwater level decrease caused by drainage on tunnel water inflow

IF 1.3 4区工程技术 Q3 ENGINEERING, GEOLOGICAL

Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-04-20 DOI:10.1144/qjegh2023-019

Pengtao An, Maoxiang Li, Helin Fu

{"title":"Analysis of the impact of groundwater level decrease caused by drainage on tunnel water inflow","authors":"Pengtao An, Maoxiang Li, Helin Fu","doi":"10.1144/qjegh2023-019","DOIUrl":null,"url":null,"abstract":"Affected by the excavation, the phenomenon of groundwater level drop around mountain tunnels is widespread, resulting in poor accuracy of the existing water inflow calculation formula derived when the groundwater level is fixed. Based on this, a simplified calculation model of tunnel water inflow is constructed when considering drainage, and the tunnel water inflow is calculated according to the Dupuit assumption and conformal transformation. The law of conservation of fluid mass is used to solve the equivalent water head around the tunnel after drainage, and the Taylor formula is used for degradation analysis, and the rationality of the model construction and the correctness of the formula derivation are verified through the tunnel under construction and numerical simulation. Finally, the sensitivity of the characteristic parameters is studied, the evolution law of the equivalent head is revealed, and the influence mechanism is discussed. The research shows that the error between the calculated value of tunnel water inflow and the field measured value can be reduced from 16.1% to 8.9%, which improves the prediction accuracy of tunnel water inflow to a certain extent.","PeriodicalId":20937,"journal":{"name":"Quarterly Journal of Engineering Geology and Hydrogeology","volume":" ","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Quarterly Journal of Engineering Geology and Hydrogeology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/qjegh2023-019","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Affected by the excavation, the phenomenon of groundwater level drop around mountain tunnels is widespread, resulting in poor accuracy of the existing water inflow calculation formula derived when the groundwater level is fixed. Based on this, a simplified calculation model of tunnel water inflow is constructed when considering drainage, and the tunnel water inflow is calculated according to the Dupuit assumption and conformal transformation. The law of conservation of fluid mass is used to solve the equivalent water head around the tunnel after drainage, and the Taylor formula is used for degradation analysis, and the rationality of the model construction and the correctness of the formula derivation are verified through the tunnel under construction and numerical simulation. Finally, the sensitivity of the characteristic parameters is studied, the evolution law of the equivalent head is revealed, and the influence mechanism is discussed. The research shows that the error between the calculated value of tunnel water inflow and the field measured value can be reduced from 16.1% to 8.9%, which improves the prediction accuracy of tunnel water inflow to a certain extent.

查看原文本刊更多论文

排水引起的地下水位下降对隧道涌水的影响分析

受开挖影响，山地隧道周边地下水位下降现象普遍存在，导致现有的地下水位固定时的涌水量计算公式精度较差。在此基础上，建立了考虑排水条件下隧道涌水量的简化计算模型，并根据Dupuit假设和保形变换计算隧道涌水量。采用流体质量守恒定律求解排水后隧道周围的等效水头，采用泰勒公式进行退化分析，并通过在建隧道和数值模拟验证了模型构建的合理性和公式推导的正确性。最后，研究了特征参数的敏感性，揭示了等效水头的演化规律，并对其影响机理进行了探讨。研究表明，隧道涌水计算值与现场实测值的误差可由16.1%减小到8.9%，在一定程度上提高了隧道涌水预测精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Quarterly Journal of Engineering Geology and Hydrogeology 地学-地球科学综合

CiteScore

3.40

自引率

14.30%

发文量

审稿时长

6 months

期刊介绍： Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.