Experimental study on seepage characteristics and water inrush of filled karst structure in tunnel

Meng, Yaoyao; Jing, Hongwen; Yin, Qian; Wu, Xingjie

doi:10.1007/s12517-020-05474-9

Cited by 24 publications

(4 citation statements)

References 25 publications

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“…Karst pipes possess good underground connectivity. The related disasters are mainly characterized by climatic instantaneous discharge of water and mud inrush, with great suddenness, high frequency, and great severity [29]. The scale of water inrush caused by underground rivers is large, and the disaster is catastrophic because underground rivers are rich in water sources and greatly affected by rainfall [30].…”

Section: Introductionmentioning

confidence: 99%

Identification and Treatment of Collapse and Mud Inrush Caused by Deep Karst Trough in Tunnels

et al. 2023

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To predict and prevent the collapse and mud inrush caused by the deep karst trough in tunnels, an engineering case is studied. Firstly, a comprehensive identification method for the hazard-causing structure of the deep karst trough in tunnels is proposed and successfully applied. Secondly, the morphological characteristics and developmental mechanism of the deep karst trough are studied. The hazard-causing structure is mainly developed at the entrance section of the karst tunnel, which is funnel-shaped, mostly filled with clay and a small amount of gravel. The development scale is affected by the geological structure, tectonic movement, formation lithology and inclination, sunshine and precipitation, and surface soil. Thirdly, four hazard-causing modes of the collapse and mud inrush are proposed, i.e., rock mass failure of tunnel face, direct exposure of tunnel face, direct exposure of tunnel roof, and rock mass failure of tunnel roof. Finally, a treatment technology for collapse and mud inrush is put forward. The treatment technology is to “remove the mud, fill the karst cave, conduct advance grouting, strengthen the support, waterproof the collapse area, backfill the collapse pit.” The collapse and mud inrush of Qiyueshan Tunnel was successfully treated by using the above technology.

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Section: Introductionmentioning

confidence: 99%

Identification and Treatment of Collapse and Mud Inrush Caused by Deep Karst Trough in Tunnels

et al. 2023

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“…Pan et al [10], through a model experiment to study the failure process of tunnel faces at the front of water-filled limestone caves, divided the failure processes in the model into the production of group cracks, the formation of water inrush channels and the complete collapse of waterresistant plates. Meng et al [11] independently developed a model test system for water and mud inrush in a tunnel to study the structural instability characteristics and seepage law of karst pipeline fillers with different permeability coefficients. Gao et al [12] took Kaiyuansi Tunnel as an example, carried out physical model and numerical simulations and analyzed the water leakage, vertical displacement and water pressure results for the monitored section.…”

Section: Introductionmentioning

confidence: 99%

Study on the Characteristics of Surrounding Rock and Design of Backfill Material Parameters for Tunnels Passing through Giant Caverns and Underground Rivers

Wang

Feng³

2022

Applied Sciences

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The influence on tunnel construction of karst and underground rivers is always an important problem in tunnel engineering. In order to demonstrate the rationality of backfill parameters and the effectiveness of supports under the influence of groundwater when a tunnel passes through a large karst cave, the finite element software FLAC3D was used for numerical analysis. Converting the mean values and standard deviations of mechanical response results of the surrounding rock and the supports on multiple sections into the ECULID distance from the origin point on a two-dimensional plane as evaluation indexes, the influence of the reinforcement parameters on the mechanical response of the surrounding rock and the supports was analyzed by orthogonal experiments. Based on fuzzy decision theory, by regarding the ECULID distance between the simulated result of each group and the global optimal value of the multiple evaluation index as the comprehensive evaluation index, a backfill parameter design method was proposed. By comparing the results which used optimal and worst parameters in the FLAC3D, 10 times and 2.5 times differences in longitudinal and horizontal displacement were observed, respectively. Then, the optimal backfill parameters were applied to the actual project for verification. The field monitoring results showed that the optimal backfill parameters can effectively reduce the displacement around the tunnel. After constructing a diversion for the underground river, the water flow in the karst cave did not rise during a rainstorm. This study provides a reference for the design and construction of other projects in the future.

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“…Mao and Akihiro [35] carried out the permeability test of cohesive soil, using a triaxial permeability tester to explore the influence of initial fine particle content on the seepage instability process. Meng et al [36] employed the three-dimensional model test system of mine water inrush to analyze the structural instability characteristics and seepage laws of karst conduit fillings with different permeability coefficients. However, the aforementioned research results mainly focus on the study of the seepage characteristics of cohesiveless soil.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Seepage Characteristics of Filling Structures in Deep Roadway

Shi

Zhu

Cao³

et al. 2022

Geofluids

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In order to study the seepage failure mechanism of roadway filling medium consisting of cohesive soil under complex hydrogeological conditions, a large-scale triaxial stress-seepage test system was utilized to investigate the influence of kaolin content and seepage loading rate on the seepage characteristics of filling medium. Through the analysis on the variation rules of sand loss and particle size distribution, the seepage characteristics and whole process of seepage instability of filling medium were explored in depth. It is concluded that (1) The seepage instability process of filling medium can be categorized into three stages: the initiation loss of fine clay, the accelerating loss of soil, and the stable status of soil loss. (2) The seepage failure process rate is proportional to the seepage loading rate and inversely proportional to the content of kaolin. (3) The kaolin and sand content of remaining mixture presented initial>bottom>middle>top status. The research results have guidance value for exploring the instability evolution mechanism of filling medium in deep roadway.

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Experimental study on seepage characteristics and water inrush of filled karst structure in tunnel

Cited by 24 publications

References 25 publications

Identification and Treatment of Collapse and Mud Inrush Caused by Deep Karst Trough in Tunnels

Identification and Treatment of Collapse and Mud Inrush Caused by Deep Karst Trough in Tunnels

Study on the Characteristics of Surrounding Rock and Design of Backfill Material Parameters for Tunnels Passing through Giant Caverns and Underground Rivers

Experimental Study of Seepage Characteristics of Filling Structures in Deep Roadway

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