A geological assessment method of floor water inrush risk and its application

Meng, Zhaoping; Li, Guoqing; Xie, Xiaotong

doi:10.1016/j.enggeo.2012.06.004

Cited by 119 publications

(50 citation statements)

References 6 publications

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“…Coal mine workers' safety and coal production have been deeply threatened by coal mine water inrush accidents (Meng et al, 2012), and the accidents frequently occur according to the latest statistics in China (Wang et al, 2012). It has been proved that the majority of the water inrush accidents are related with the fracture zone and its proportion is more than 80 % (Bu et al, 2009;Li et al, 2010;Xu, 2011;Qiao et al, 2013;Lu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental study of water seepage propagation behavior in the fault

Huang¹

2014

Acta Geodynamica Et Geomaterialia

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Coal mine water inrush has an impartible relationship with the fracture zone such as faults, which deeply threaten the safety production in China. In order to study the water seepage behavior in the fault and the impermeability of the fault when water inrush through fault occurs, some water inrush cases through faults were analyzed, and water injection tests which drilled one injection borehole and one observation borehole into the fault zone were carried out at one coal mine. The breakdown pressure, reopening pressure, as well as the initial water seepage pressure, impermeability and the initial hydraulic conductivity of Puzizhier fault, were obtained from the result of the water injection tests. The study shows that water seepage in faults goes through three stages which consist of pore flow, fracture flow and pipe flow. It shows a process of the fine particulates and existing in-fill in the fault zone washing out and original and newborn cracks expanding and connecting. The results of water injection tests can be thought to show the fault healing effect under the underground pressure. In addition, the risk of water inrush through faults owes a great deal to the characteristic of water source. ARTICLE INFO

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Section: Introductionmentioning

confidence: 99%

Analytical and experimental study of water seepage propagation behavior in the fault

Huang¹

2014

Acta Geodynamica Et Geomaterialia

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“…It can cause a reduction in strength of the surrounding rock, a structural plane softening of the rock mass, an increase of the pore water pressure, and tunnel disasters, e.g., water and mud inrush [17][18][19]. Many scholars have performed a great deal of research on risk evaluation of water and mud inrush in karst tunnels [20][21][22]. Zhou et al [23] established an optimal classification method based on grey system theory (GST) to evaluate the risk of water inrush and predict the occurrence probability in karst tunnels.…”

Section: Introductionmentioning

confidence: 99%

Assessment of a Concealed Karst Cave’s Influence on Karst Tunnel Stability: A Case Study of the Huaguoshan Tunnel, China

Huang

et al. 2018

Sustainability

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Abstract:In order to assess a concealed karst cave's influence on karst tunnel stability, an assessment model is proposed based on the analytic hierarchy process and a statistical analysis of relevant engineering projects. Major factors are studied and selected as impact factors of the assessment model based on a statistical analysis on a karst cave' s development conditions (karst hydrogeological and engineering geological conditions), construction conditions, and controlling measures. A weight analysis of factors shows that the surrounding rock grade, supporting measurement, formation lithology, unfavorable geology, construction methods, blasting techniques, advanced geological forecast, and groundwater level are the main controlling factors of the tunnel stability when there is a concealed karst cave in the tunnel. Topography and geomorphology, attitude of rocks, monitoring measurement, strata combination, and interlayer fissures are the minor influence factors. Tunnel section shapes, in situ stress, and geological logging are the least important factors. The proposed method is successfully applied to the assessment of a concealed karst cave's influence on the stability of the Huaguoshan Tunnel on the Enshi-Laifeng and Enshi-Qianjiang Expressways. The evaluation result agrees well with the construction site situation. In addition, the result provides good guidance with respect to the implementation of the treatment scheme and effectively avoids accidents in real-time.

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“…In the current literature, when coal was mined-out above the confined aquifers, most studies focus on revealing the patterns of water inrush and mining-induced damage of the floor under the coupled actions of seepage and stress. These studies are mostly conducted via theoretical analysis, similitude simulations and numerical calculations [2]. Similitude model experiment, in particular, provides a realistic depiction of the relationship between engineering structures and geological conditions, which provides an accurate simulation of the operational processes on rock masses, so the similitude experiment becomes an effective method for studying large and complex systems.…”

Section: Introductionmentioning

confidence: 99%

“…The similitude materials also must meet the similarity requirements in terms of their deformation characteristics and the hydrophysical characteristics. (2) The requirements for the sealing procedures of the similitude equipment are extremely stringent. (3) Requirements for the reliability of the methods are used to monitor changes of the seepage and stress fields [3].…”

Section: Introductionmentioning

confidence: 99%

Novel Experimental Model to Investigate Fluid-Solid Coupling in Coal Seam Floor for Water Inrush

Zhang

2018

Teh. vjesn.

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Fluid-solid coupling simulation experiment is an important method for studying water inrush from the coal seam floor. However, the experiment involves seepage-stress coupling problems, and most existing fluid-solid coupling model experiment systems do not meet sealing requirements. To address this issue and to successfully conduct the model experiment, a novel similitude experimental model with excellent sealing was developed for studying fluid-solid coupling during water inrush from the floor of the coal seam. Similitude relationships were also derived using mathematical models for fluid-solid coupling in homogeneous continuum media, and non-hydrophilic fluid-solid coupling similitude materials were prepared. Results show that the experimental system can be used to analyse the variation characteristics of the floor stress and the water pressure, and the mining-induced floor stresses can be divided into three distinct stages, such as the pre-mining stress-increasing stage, the post-mining stress-decreasing stage, and the stress recovery stage. The conclusions obtained in the study have important theoretical value to direct the similar engineering practice.

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A geological assessment method of floor water inrush risk and its application

Cited by 119 publications

References 6 publications

Analytical and experimental study of water seepage propagation behavior in the fault

Analytical and experimental study of water seepage propagation behavior in the fault

Assessment of a Concealed Karst Cave’s Influence on Karst Tunnel Stability: A Case Study of the Huaguoshan Tunnel, China

Novel Experimental Model to Investigate Fluid-Solid Coupling in Coal Seam Floor for Water Inrush

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