Groundwater outbursts from faults above a confined aquifer in the coal mining

Zhang, Rui; Jiang, Zhenquan; Zhou, Hu; Chaowei, Yang; Xiao, Shuaijun

doi:10.1007/s11069-013-0981-7

Cited by 100 publications

(31 citation statements)

References 14 publications

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“…In addition, the most productive wells at Makutupora depression are all placed along geological faults particularly Mlemu and Kitope faults (Shindo 1991;Rwebugisa 2008). Generally, the likelihood of groundwater occurrence along faults is a well-known science (Zhang et al 2014) especially when the faults intersect the ground surface (Siebert et al 2007). Locally, several wells along faults had high yields (FOs and measurements).…”

Section: Occurrence Of Groundwater Along Geological Faultsmentioning

confidence: 99%

Indigenous knowledge on development and management of shallow dug wells of Dodoma Municipality in Tanzania

et al. 2018

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Dodoma city, central Tanzania, seats in a semi-arid region of East Africa with limited rains and surface water resources. Consequently, the area largely depends on shallow and deep aquifers for its freshwater needs. Owing to harsh climatic conditions, chronic lack of year-round surface water bodies and, limited development of water distribution infrastructures, over year's local people have nurtured, developed and, passed on important indigenous knowledge (IK) on exploiting and managing shallow aquifers (SAs). However, there is no clear documented administrative plans for the SAs and the roles of IK, which is widely practised in developing SDWs and managing SAs, are not properly documented. This study intended to assess the extent of shallow dug wells (SDWs) utilization and contribution of IK on management of SAs of indigenous people of Dodoma Municipality. The methods followed include critical field observations, measurements and, focus group discussions done during both the dry season (Sep.-Oct. 2013) and wet season (Dec. 2013-Feb. 2014). The results show that SDWs occur widely in the city, particularly in the suburbs, where they often serve as the only sources of freshwater and heavily dependent by the populace. It is clear that there is rich IK on management of SAs including on groundwater exploration, digging, water allocation, pricing, and even on water quality and, water treatment skills. The aforementioned IK clearly contribute to water sufficiency to the populace and general management of groundwater such as enhancing recharge mechanisms where about 1% of local rainfall is recharged through a network of SDWs compared to ~ 5-10% that is naturally being recharged by rainfall through the vadose zone. Thus, as much as the current policy framework and groundwater managers do not recognize the roles of IK and contributions of SDWs as key water sources, it is clear that IK contributes to the groundwater management and SDWs already support large part of the society. While it is globally appreciated that vital skills on SDWs management are vanishing, local people in Dodoma still retain them and should, therefore, be preserved. It is further recommended that IK are strengthened, improved and most importantly, incorporated in the local water resources management plans that already advocate on integrated approaches but which clearly ignores the IK and the local people's efforts to explore and manage water resource, particularly SAs.

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Section: Occurrence Of Groundwater Along Geological Faultsmentioning

confidence: 99%

Indigenous knowledge on development and management of shallow dug wells of Dodoma Municipality in Tanzania

et al. 2018

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“…Despite the significant progress in understanding KCPs water inrush mechanism and water prevention technology over the past several decades [20][21][22], most investigations were carried out with respect to structure failure, and few have investigated this issue by integrating the solid-fluid interaction and particles migration due to erosion. Water inflow rate, as probably the only direct measuring data in the field, has yet to be directly used in the literature to predict the precise time of water inrush.…”

Section: Introductionmentioning

confidence: 99%

Predicting Erosion-Induced Water Inrush of Karst Collapse Pillars Using Inverse Velocity Theory

et al. 2018

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Although the impact of Karst Collapse Pillars (KCPs) on water inrush has been widely recognized and studied, few have investigated the fluid-solid interaction, the particles migration inside KCPs, and the evolution feature of water inrush channels. Moreover, an effective approach to reliably predict the water inrush time has yet to be developed. In this work, a suite of fully coupled governing equations considering the processes of water flow, fracture erosion, and the change of rock permeability due to erosion were presented. The inverse velocity theory was then introduced to predict the water inrush time under different geological and flow conditions. The impact of four different controlling factors on the fracture geometry change, water flow, and inrush time was discussed in detail. The results showed that the inverse velocity theory was capable of predicting the occurrences of water inrush under different conditions, and the time of water inrush had a power relationship with the rock heterogeneity, water pressure, and initial particle concentration and an exponential relationship with the initial fracture apertures. The general approach developed in this work can be extended to other engineering applications such as the tunneling and tailing dam erosion.

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“…Based on the Mohr-Kulun failure criterion, Hoffman studied the variation law of the slip zone cohesive force when fault activation was unstable and concluded that the change of cohesion was the key to the activation of faults [15]. Zhang et al investigated the process of water inrush from fault caused by coal seam mining above the confined aquifer by physical simulation test and found that mining causes fault permeability enhancement, fault zone seepage flow from small to large which could be divided into three distinct phases, and the final fault generated activation of water inrush [16]. Wu et al analyzed water inrush from fault with the combination of in-situ measurement and laboratory test.…”

Section: State Of Artmentioning

confidence: 99%

Water Inrush Mechanism Caused by Fault Activation Based on Stress Evolution of Surrounding Rock of Key Aquifer

Zhai¹,

Wu²,

Zhang³

et al. 2017

JESTR

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Water inrush accidents in coal mines are becoming increasingly serious with the increase in mining depth. Among these accidents, water inrush caused by fault activation is the most common. The water inrush mechanism cannot be revealed by the traditional method in determining whether the fault is activated by the displacement difference between the two walls of the fault. The fault Sun of Longdong coal mine was considered a research target, and the research methods of similar simulation test and numerical simulation were used based on the mining stress characteristics of surrounding rock of the key aquifer to investigate the water inrush mechanism and main control factors due to fault activation in mining. The mining characteristics of fault zone rock mass were analyzed in the process of coal pillar reduction, and the change in water inrush risk in the process of coal pillar reduction was revealed from the surrounding rock stress state of the key aquifer. Results show that the stress transfer law is evidently different in hanging wall and footwall. The stress state of the hanging wall rock near the fault zone is dominated by the compressive stress, whereas the stress state of the footwall changes with buried depth. The stress state of the surrounding rock roof of the key aquifer and fault zone changed from compressive to tensile stress, when the width of the coal pillar was 30 m. The degree of pressure relief increases with depth, and the results obtained by the two methods are consistent. Evident shear failure occurs in the fault zone, and such failure is unfavorable for water prevention. The conclusions in this study provide theoretical basis to retain the coal pillar.

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Groundwater outbursts from faults above a confined aquifer in the coal mining

Cited by 100 publications

References 14 publications

Indigenous knowledge on development and management of shallow dug wells of Dodoma Municipality in Tanzania

Indigenous knowledge on development and management of shallow dug wells of Dodoma Municipality in Tanzania

Predicting Erosion-Induced Water Inrush of Karst Collapse Pillars Using Inverse Velocity Theory

Water Inrush Mechanism Caused by Fault Activation Based on Stress Evolution of Surrounding Rock of Key Aquifer

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