Estimating the geological strength index and disturbance factor in the Hoek–Brown criterion using the acoustic wave velocity in the rock mass

Xia, Kaizong; Chen, Congxin; Wang, Tianlong; Zheng, Yun; Wang, Yue

doi:10.1016/j.enggeo.2022.106745

Cited by 43 publications

(17 citation statements)

References 43 publications

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“…The specific information about the joints in hanging wall obtained from geological exploration are shown in Figure 1 and Table 1 (Ge et al, 1999;Chen 2006;Xia et al, 2019b). Due to the cutting of these joints, the geological strength of the rock mass in the hanging wall was greatly reduced (Xia et al, 2022).…”

Section: Study Projectmentioning

confidence: 99%

Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China

Yang

Chen²,

Sun³

et al. 2023

Front. Earth Sci.

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In this paper, mining-induced deformation for haulage drifts of the hanging wall at Jinshandian Iron Mine is investigated, based on 8 monitoring stations adopted laser convergence meters. Monitoring results are analyzed to divide deformation-time curves into three types: fluctuation type, partial folding type and whole folding type. Moreover, it is found that tensile deformation is easy to occur in the roadway section corresponding to no folding type and partial folding type. And in the roadway section with folding type curve, it is obviously affected by the steeply anti-inclined structural plane. Furthermore, the relative position relationship between mining activities and a monitoring station is established through local coordinate system. Mining effects on roadway deformation are studied based on rectangular coordinate components and polar coordinate components respectively. The critical value of coordinate components that have a significant impact on roadway deformation have been determined. At last, combined with results of mining impact analysis, deformation mechanisms corresponding to the three deformation curves are revealed. These results help determine the appropriate support time and adopt targeted support schemes.

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Section: Study Projectmentioning

confidence: 99%

Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China

Yang

Chen²,

Sun³

et al. 2023

Front. Earth Sci.

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“…Three-dimensional printed technology was used to study a columnar jointed rock mass [ 39 , 40 ], and acoustic wave velocity was adopted to improve the Hoek–Brown criterion, which can be better applied in metal mines [ 41 ]. Aydan and Kawamoto proposed a cantilever beam model to evaluate the stability of slopes and underground openings in their study [ 42 ].…”

Section: Theoretical Analysis Of the Ground Movement Mechanismmentioning

confidence: 99%

Ground Movement in the Hanging Wall of Underground Iron Mines with Steeply Dipping Discontinuities: A Case Study

et al. 2023

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To ensure the safety of underground mining activities and effectively protect the surface production facilities and houses of the nearby residents, the ground movement caused by the sublevel caving method needs to be studied. In this work, the failure behaviors of the surface and drift of the surrounding rock were investigated based on the results of in situ failure investigations, monitoring data, and engineering geological conditions. The results were then combined with theoretical analysis to reveal the mechanism responsible for the movement of the hanging wall. Driven by the in situ horizontal ground stress, horizontal displacement plays an imperative role in both the movement of the ground surface and underground drifts. Accelerated movement is found to occur in the ground surface which coincides with the occurrence of drift failure. Failure occurs in the deep rock masses and then gradually propagates to the surface. The steeply dipping discontinuities are the main reason for the unique ground movement mechanism in the hanging wall. As steeply dipping joints cut through the rock mass, the rock surrounding the hanging wall can be modeled as cantilever beams subjected to in situ horizontal ground stress and lateral stress due to caved rock. This model can be used to obtain a modified formula for toppling failure. Also, a mechanism of fault slipping was proposed, and the condition required for fault slipping was obtained. Based on the failure mechanism of steeply dipping discontinuities, the ground movement mechanism was proposed considering the horizontal in situ ground stress and caved rock mass: slippage of fault F3, slippage of fault F4, and toppling of rock columns. Based on the unique ground movement mechanism, the goaf surrounding rock mass could be divided into six zones: a caved zone, a failure zone, a toppling-slipping zone, a toppling-deformation zone, a fault-slipping zone, and a movement-deformation zone.

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“…Research has shown that stress relief in coal seams can significantly increase the permeability of coal seams (Zhang et al, 2017). In order to improve the permeability of coal seams more effectively, researchers have conducted a lot of research on different stress relief methods and rock mechanics (Wang et al, 2022;Xia et al, 2022). The effective stress relief and improvement of permeability can primarily control and prevent coal and gas outbursts in the coal seam with tectonic soft coal and thus increase the efficiency of gas drainage (Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Research and application of pressure relief and permeability improvement in high gas outburst mines by directional drilling and hydraulic jet

Chen

Zhang

et al. 2023

Front. Earth Sci.

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Efficient gas extraction technology is an important topic for low permeability and high gas outburst coal seam. Based on the engineering background of Hudi Coal Mine with the soft and hard coal seams and the existing hydraulic permeability enhancement technology, a new construction process to improve coal seam permeability was proposed to effectively reduce coal seam gas content and the risk of coal and gas outburst. In this measure, the roadway in floor was replaced with a directional main borehole, directional branch boreholes were used to replace crossing holes, and soft coal was mined along soft sub layers via the directional drilling machine and directional hydraulic jet. Main boreholes are drilled parallel to the seam in the coal seam floor, and branch boreholes are drilled through the floor and coal seam. The numerical simulation was used to study the permeability improvement effect of different mining diameters by the proposed measure. The result showed that, as the mining diameter increased from 2 m to 4 m, the average influence diameter of coal seam porosity increased from 15.44 m to 19.65 m, and the average influence diameter of the permeability increased from 15.75 m to 20.07 m, which is three times the influence range of the ordinary borehole. The application of the proposed measure and its supporting equipment was carried out under the special coal seam and gas conditions of Hudi Coal Mine. Results show that the soft coal was mined efficiently along the soft sub layer using the main borehole, branch boreholes, and directional hydraulic jet. Compared the traditional hydraulic flushing in the borehole with the ordinary drilling machine, the average speed of mining soft sub layers increased from 0.5 t/h to 3.6 t/h, the equivalent mining diameter of soft sub layers increased from 1.2 m to 7.6 m, and the average flow of gas extraction increased from 0.41 m3/d to 6.25 m3/d. The conclusions obtained in this study can provide a reference for coal mine gas extraction with similar coal seam conditions.

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Estimating the geological strength index and disturbance factor in the Hoek–Brown criterion using the acoustic wave velocity in the rock mass

Cited by 43 publications

References 43 publications

Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China

Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China

Ground Movement in the Hanging Wall of Underground Iron Mines with Steeply Dipping Discontinuities: A Case Study

Research and application of pressure relief and permeability improvement in high gas outburst mines by directional drilling and hydraulic jet

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