Numerical simulation of pressure relief in hard coal seam by water jet cutting

Song, Dazhao; Wang, Enyuan; Xu, Jiankun; Liu, Xiaofei; Shen, Rongxi; Xu, Wenquan

doi:10.12989/gae.2015.8.4.495

Cited by 23 publications

(12 citation statements)

References 16 publications

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“…Several cases of cavitation damage in a chute of spillways documented [17,28,29]. The flow pressure and velocity are the main parameters to evaluate the cavitation potential as shown in the following equation [28,30]:…”

Section: Hydraulic Performancementioning

confidence: 99%

Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

Faridmehr

Nejad

Baghban

et al. 2020

Water

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Maintaining the reservoir safety of large dams has considerable importance for the public where they are constructed in heavily populated and industrialized areas. The extreme hydrodynamic force caused by ground acceleration, cavitation damage, and vibration are among concerns that threaten the safety of the spillway and its conveyance structures when subjected to a natural disaster, such as earthquakes and severe floods. Current research investigates the hydrostatic and hydrodynamic performance of the Karkheh Dam spillway radial gate through 3-D finite element (FE) models using ABAQUS/Explicit. The common loads applied on the radial gate were reviewed and stress–strain in the skin plate and trunnion were investigated as a result of developed hydrodynamic pressures. The performance of conveyance structures subjected to significant discharge was also investigated through a small-scale model to evaluate the cavitation damage index. The results of this research will help researchers in the field of civil and hydraulic engineering for the risk analysis of the radial gates and conveyance structures.

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Section: Hydraulic Performancementioning

confidence: 99%

Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

Faridmehr

Nejad

Baghban

et al. 2020

Water

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“…In order to determine the influence distance of mininginduced stress, the curve formed by connecting the points, where the mining-induced stress is equal to 1.05 times the in situ stress [15,16], is defined as mining-induced stress contour.…”

Section: Numerical Simulation Udec 2dmentioning

confidence: 99%

New Method to Design Coal Pillar for Lateral Roof Roadway Based on Mining‐Induced Stress: A Case Study

Wang

Chen

et al. 2018

Advances in Civil Engineering

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The traditional method to design coal pillar for lateral roof roadway was established based on the mining-induced strata movement contour which is considered as a straight line, while ignoring the variations of the internal strata deformation law as well as stress distribution characteristics. In order to make up for this deficiency, in this study, evolution of mining-induced stress in the overlying strata was simulated using physical and numerical simulations, and a method to design coal pillar for lateral roof roadway based on mining-induced stress was proposed. The results indicate that the stress of the overlying strata is redistributed during excavation, and the stress distribution can be divided into a stress-relaxation area, a stress-concentration area, and an in situ stress area. The contour line of 1.05 times the in situ stress is used to define the mining-induced stress contour. Stress inside the contour is redistributed while outside the contour the overlying strata are still within the in situ stress area. Mining-induced stress contour presents a concave-upward type from coal seam to the overlying strata that cannot be merged into a straight one due to their different characteristics of movement and deformation. With this in mind, this study proposed a method to design the width of coal pillar for lateral roof roadway according to the mining-induced stress contour. According to mining-induced stress contour, the width of coal pillar for lateral roof roadway of longwall panel 31100 is 160 m, and the maximum deformation of the roadway is 270 mm. The new method can definitely meet engineering demands.

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“…Because the range of plastic zone around a borehole is small, additional technologies, such as hydraulic flushing, hydraulic broaching, and hydraulic slotting, are utilized to enlarge the effective influence radius of borehole (Wang et al, 2013;Ge et al, 2014;Zou et al, 2015;Lin et al, 2014;Liu et al, 2015b;Song et al, 2015). In this paper, the radius of borehole referred to the radius enlarged after using additional technologies.…”

Section: The Radius Of Boreholementioning

confidence: 99%

“…To overcome this limitation, "hydraulic flushing" is adopted, which helps to further increase the permeability of coal seams. This technology is now widely used in Chinese colliery and several studies have reported that the gas drainage efficiency is improved and the outburst accidents are reduced after following this technology Chang et al, 2008;Yang and Wang, 2010;Wei et al, 2010;Wang et al, 2011;Song et al, 2015). Hydraulic flushing utilizes rock roadway as the safety barrier.…”

Section: Introductionmentioning

confidence: 99%

Coupled analysis about multi-factors to the effective influence radius of hydraulic flushing: Application of response surface methodology

Kong

Wang

Liu

et al. 2016

Journal of Natural Gas Science and Engineering

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Numerical simulation of pressure relief in hard coal seam by water jet cutting

Cited by 23 publications

References 16 publications

Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

New Method to Design Coal Pillar for Lateral Roof Roadway Based on Mining‐Induced Stress: A Case Study

Coupled analysis about multi-factors to the effective influence radius of hydraulic flushing: Application of response surface methodology

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