Study of advanced dewatering and its influence on tunnel in water rich and sandy dolomite stratum

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2023-08-29 DOI:10.1007/s10064-023-03381-3

Yifan Jiang, Jinyi Li, Feicong Zhou, Qi Yongli, Hua Huang, Xiaobing Li, Zhijie Wang, Ping Zhou

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Abstract

The influence of groundwater on sandy dolomite stratum renders it highly susceptible to disasters, resulting in frequent water inrush accidents during tunnel construction. Advanced dewatering is crucial in enhancing tunnel face stability. It is found that sandy dolomite comprises a porous permeable medium consisting of dolomite sand and dolomite powder, characterized by low shear resistance and deformation resistance. Through the fluid–solid coupling model test device developed, it has been proven that the release of pore water pressure via advanced dewatering substantially enhances the stability of the tunnel face in water-rich sandy dolomite stratum prone to seepage failure. By conducting fluid–solid coupling analysis, the impact of drainage pipe length on the dewatering effect is investigated, and the improvement in tunnel face stability due to varying drainage pipe lengths is evaluated using the limit equilibrium analysis method. It is observed that drainage pipes reduce the range of slip body in front of the tunnel face and mitigate seepage forces by dissipating pore water pressure, consequently enhancing tunnel face stability and reducing extrusion deformation. However, there exists an efficiency limit regarding drainage pipe length. For initial water levels of 30, 50, 80, and 120 m, it is recommended to employ advanced drainage pipes of 20, 25, 30, and 40 m or more, respectively.

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富水砂质白云岩地层超前降水及其对隧道的影响研究

地下水对砂质白云岩地层的影响使其极易发生灾害，导致隧道施工中突水事故频发。超前脱水是提高巷道工作面稳定性的关键。发现砂质白云岩是由白云石砂和白云石粉组成的多孔渗透介质，具有较低的剪切阻力和抗变形能力。通过研制的流固耦合模型试验装置，证明在易发生渗流破坏的富水砂质白云岩地层中，超前脱水释放孔隙水压力可显著提高巷道工作面稳定性。通过流固耦合分析，研究了排水管道长度对降水效果的影响，并利用极限平衡分析方法评价了不同排水管道长度对巷道工作面稳定性的改善作用。研究发现，排水管通过分散孔隙水压力，缩小了巷道前方滑体的范围，减轻了渗流力，从而提高了巷道的稳定性，减少了挤压变形。然而，排水管道长度存在效率限制。当初始水位为30m、50m、80m、120m时，建议采用20m、25m、30m、40m及以上的超前排水管。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.