Deformation Characteristics and Determination of Optimum Supporting Time of Alteration Rock Mass in Deep Mine

Yu, Weijian; Pan, Bao; Zhang, Fang; Yao, Shufu; Liu, Fangfang

doi:10.1007/s12205-019-0365-y

Cited by 76 publications

(46 citation statements)

References 20 publications

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“…It was understood from the testing that the strength of rock specimens after grouting reinforcement is 0.7∼2.0 times higher than the residual strength before grouting [31][32][33][34]. It was noticed through the field test that the grouting can fill the crack of surrounding rock in time and recement the broken rock mass together.…”

Section: Ground Support Strategymentioning

confidence: 99%

Deformation Mechanism and Support Technology of Deep and High‐Stress Soft Rock Roadway

Zheng

Zuo

et al. 2021

Advances in Civil Engineering

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In this study, the analysis and control of stability of surrounding rock in deep fractured soft rock roadway located in the underground mine of Jinfeng gold mine in Guizhou Province, China, has been investigated. The surrounding rock of roadway has been analyzed to characterize its deformation and failure mechanism through field survey, testing of rock physical and mechanical properties, in situ stress measure, analysis of mineral components of rock, and investigation of rock fragmentation degree. Based on the numerical simulation technology, the influence of different factors on the stability of roadway is studied. The physical and mechanical properties of surrounding rock and the bearing capacity of surrounding rock layer are to be improved to maintain the stability of broken soft rock roadway as high ground stress, rock fragmentation, and poor lithology leading to tunnel instability. Hence, a high-strength “cable bolt + fiber-reinforced shotcrete + steel mesh + split sets + resin bolt + cement grouting” combined support system has been proposed to improve the effective bearing structure significantly with high integrity and bearing capacity.

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Section: Ground Support Strategymentioning

confidence: 99%

Deformation Mechanism and Support Technology of Deep and High‐Stress Soft Rock Roadway

Zheng

Zuo

et al. 2021

Advances in Civil Engineering

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“…For example, when the lateral pressure coefficient increases from 2.5 to 2.8, the radius of the plastic zone increases from 6.4 to 12.5 m. is demonstrates that the plastic yield failure of the surrounding rock mass in this range is extremely sensitive to the lateral pressure coefficient-even if the lateral pressure coefficient does not change by much, it may cause localized deformation and failure of the surrounding rock. rough field investigations and a literature search [20,21], it is apparent that many underground roadways are in high-ground-stress areas with relatively large lateral pressure coefficients, leading to butterfly plastic zones around the roadways. e formation and nonlinear expansion of the butterfly plastic zone also theoretically proves that the two top and bottom corners of the roadway obtained from field investigations often suffer from shear deformation and failure.…”

Section: Influence Of Lateral Pressure Coefficient On Plastic Zone Ofmentioning

confidence: 99%

Theoretical Analysis on Distribution Pattern of Plastic Zone in Surrounding Rock of High‐Gas‐Coal Roadway

Che

Cao

Fan

et al. 2021

Advances in Civil Engineering

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The formation and expansion of the plastic zone is always accompanied by the deformation and failure of the roadway-surrounding rock. Based on elastoplastic theory, this paper considers the gas pressure parameters and uses the Mohr–Coulomb strength criterion to derive the implicit equation of the plastic zone boundary in the rock surrounding gas-coal roadways. The distribution characteristics of the plastic zone of gas-coal roadway-surrounding rock are studied, and the sensitivity to the gas pressure, cohesion, internal friction angle, and support strength of the roadway free face on the plastic zone of the surrounding rock is analyzed. The research results show that the plastic zone of the surrounding rock has four distribution patterns: circular, elliptical, rounded rectangle, and butterfly. Additionally, the lateral pressure coefficient, gas pressure, cohesion, and internal friction angle are found to jointly determine the distribution and range of the plastic zone. However, the support strength of the roadway free face does not change the distribution of the plastic zone but only affects its range. The circular and elliptical plastic zones are less sensitive to gas pressure, cohesion, and internal friction angle, whereas butterfly-shaped plastic zones are highly sensitive to these factors. The main manifestation of this sensitivity is that the four butterfly leaves degenerate rapidly with any decrease in the gas pressure or increase in the cohesion and internal friction angle. Larger butterfly leaves are prone to faster degeneration. The research results presented in this paper have important theoretical guiding significance and engineering application value for the design of high-gas-coal roadway support and gas drilling.

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“…e strong strata behavior is a slow or sudden release of a large amount of energy accumulated in the coal rock mass, which in general results in the damage of the coal rock mass, human casualties, and damage of mines and equipment [10,11]. At present, the characteristics and laws of the strata behaviors of single-seam mining have been studied.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Strong Strata Behaviors in the Close‐Distance Multiseam Coal Pillar Mining

Bao

Song

et al. 2021

Shock and Vibration

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According to the new stress distribution pattern and the strong strata behaviors as the characteristics of the coal pillars in the close-distance multiseam coal pillar mining, the common characteristics of different types of overlying coal pillars were summarized and analyzed. Moreover, a theoretical model for the mechanism of strong strata behaviors in the close-distance multiseam coal pillar mining was established, which was validated by the monitoring data of seismic computed tomography CT, microseism, and electromagnetic radiation (EMR). Furthermore, the results of the study indicated that the main factors affecting the strong strata behaviors were the static stress concentration caused by the overlying coal pillars and the dynamic disturbance caused by the fracturing and slipping of the overlying coal pillars and roof under the influence of mining. In the case of Xinzhouyao coal mine, the transmitted stress and lateral support pressure of the overlying coal pillars accounted for 78.3% and 16% of the vertical concentrated stress, respectively, and the areas closer to the overlying coal pillars were more susceptible to dynamic load disturbances. The monitoring results of seismic computed tomography CT and EMR demonstrated the static load stress concentration area was distributed near the overlying coal pillar, and the stress concentration degree was greater in the area of superimposed lateral support pressure and advanced support pressure. Moreover, microseismic spatial positioning revealed that the high-energy microseismic events were mainly concentrated near the overlying large coal pillars and roof. The on-site multiparameter detection results were highly consistent with the characteristics of actual strata behaviors and the conclusions of the theoretical model. This method could provide a reference for the quantitative calculation of stress distribution under similar conditions and the identification of the danger zone of strata behaviors.

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Deformation Characteristics and Determination of Optimum Supporting Time of Alteration Rock Mass in Deep Mine

Cited by 76 publications

References 20 publications

Deformation Mechanism and Support Technology of Deep and High‐Stress Soft Rock Roadway

Deformation Mechanism and Support Technology of Deep and High‐Stress Soft Rock Roadway

Theoretical Analysis on Distribution Pattern of Plastic Zone in Surrounding Rock of High‐Gas‐Coal Roadway

Investigation of Strong Strata Behaviors in the Close‐Distance Multiseam Coal Pillar Mining

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