scholarly journals Numerical Simulation of Fluid-Solid Coupling in Surrounding Rock for River Stope Mining

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Haiping Yuan ◽  
Chenghao Chen ◽  
Zhongming He ◽  
Yixian Wang
Keyword(s):  
Rock Mass ◽  
Mining Area ◽  
Calculation Model ◽  
Rock Bridge ◽  
The Road ◽  
Ore Body ◽  
Safety And Reliability ◽  
Mining Disturbance ◽  
The Stability ◽  
Seepage Channel

Mining disturbance will induce further weakening of faults and rock bridges, improve rock mass permeability and, in serious cases, conduct surface rivers to cause disasters. A numerical calculation model of river-fault in the mining area is established. Based on the fluid-solid coupling theory of rock mass, the influence of mining disturbance on the development and evolution process of rock bridge rupture and river-fault-stope potential seepage channel is simulated and calculated. Research studies show that under the disturbance of ore body mining, it is possible to form a channel from the river to fault to seepage and drainage in the stope. The disturbance of ore body mining has no great adverse effect on the stability of the rock mass at the top of F2 fault. The rock mass damage caused by mining is only distributed in local areas, and the rock bridge between the river, fault, and stope is not completely connected. The fracture of mining rock mass leads to the increase in permeability of rock mass, and seepage tends to spread in the direction of the fault, but there is no obvious through drainage channel from surface water to the stope. The results of research provide technical guidance for the mine to use the filling mining method after the river does not change the road safety and reliability certification and can also provide reference for similar mines.

scholarly journals Coupling Effect of Creep Deformation and Prestress Loss of Anchored Jointed Rock

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Bairu Zhu ◽  
Yang Song ◽  
Heping Wang ◽  
Yongqi Li
Keyword(s):  
Rock Mass ◽  
Stress Level ◽  
Coupling Effect ◽  
Jointed Rock ◽  
In Situ Stress ◽  
Calculation Model ◽  
Prestress Loss ◽  
Stress States ◽  
The Stability ◽  
Anchor Design

To explore the variation behaviour of anchor jointed rock subject to high in situ stress states, a coupling effect calculation model based on stress equality was established based on the original rheological model of rock by combining element combination theory and experiment, and the model was verified. The coupling effect between rock mass creep and bolt prestress loss is established by setting the deterioration function of bolt prestress loss. The uniaxial creep test is performed on specimens with different joint angles, and the results show that the prestress loss time in anchor rods decreases linearly with increasing stress level. With increasing stress level, the time of prestress loss decreases linearly with the increase in stress level. With increasing axial load, the deformation caused by the transverse expansion stress of the specimen can offset the compression deformation of the prestressed anchor rod. The relationship between prestress loss in anchors and creep of rock is solved theoretically, and the stability criterion for anchor jointed rock is proposed. The results of this study provide a scientific reference for anchor design of deep jointed rock mass.

scholarly journals A Strain-Softening Constitutive Model of Heterogeneous Rock Mass Considering Statistical Damage and Its Application in Numerical Modeling of Deep Roadways

2019 ◽  
Vol 11 (8) ◽  
pp. 2399 ◽  
Author(s):  
Guang Li ◽  
Fengshan Ma ◽  
Gang Liu ◽  
Haijun Zhao ◽  
Jie Guo
Keyword(s):  
Rock Mass ◽  
Strain Softening ◽  
Mining Area ◽  
Jointed Rock ◽  
Simulation Software ◽  
Softening Behavior ◽  
Underground Caverns ◽  
Heterogeneous Rock ◽  
The Stability ◽  
Statistical Damage

During the construction of underground caverns, the stability of deep underground cavern excavation, which affects the safety and sustainable development of such projects, is a hot issue. First, based on the mechanical properties of surrounding rock in deep tunnels, the strain-softening behavior, damage, and heterogeneity of rock masses are analyzed. Then, a strain-softening model of heterogeneous jointed rock mass that considers statistical damage (SSD) is developed and implemented through FLAC3D simulation software. Finally, the SSD is applied to a deep roadway in the Jinchuan mining area, and a comparative analysis of the computation results of the Mohr–Coulomb (MC) model and the strain-softening (SS) model are carried out. The numerical results are compared with the field-monitoring results, which show that the SSD model simulated the behavior of the surrounding rocks well. The results show that the deformations of the roof and floor are larger, which may serve as a reference for the support pattern of deep roadways.

scholarly journals Stability and sustainability assessment for the surface failure of various rock slopes excavated along the Konya-Alanya Road segment, Turkey

2021 ◽  
Vol 48 (4) ◽  
Author(s):  
Ali F. BAYRAM ◽  
◽  
Ahmed I. MOHAMED ◽  
Arsalan A. OTHMAN ◽  
◽  
...  
Keyword(s):  
Rock Mass ◽  
Kinematic Analysis ◽  
Slope Failure ◽  
Sustainability Assessment ◽  
Slope Instability ◽  
Laboratory Measurements ◽  
The Road ◽  
Hilly Region ◽  
Pass Through ◽  
The Stability

Most of the road networks in Turkey pass through the Hilly region. These roads are constructed through inadequate blasting accompanied by road deterioration or collapse. To date, several researchers in Turkey have not paid adequate attention to the stability analysis of road failures based on the surface orientation of the dominant discontinuity sets. This study, based on the field survey, laboratory measurements, and the use of Dips analyst software, aims to investigate the stability and sustainability of seven different sites that exhibit imminent slope failure along the Konya-Alanya Road (KAR) segment. The sites selected are geologically investigated and geotechnically evaluated using a scan-line survey. We carried out several fields and laboratory measurements. Both Slope Mass Rating (SMR) and Rock Mass Rating (RMR) are quantified and included with rock mass assessment of each slope site. Both the field and laboratory results are integrated by kinematic analysis methods to assess the potential failure of these slopes. The kinematic analysis results demonstrate that the dominant failure forms are planar, wedge, and toppling. RMRb results show that some slopes with good rock quality remain unstable and vulnerable to failure despite their fair RMRb values. While SMR results show that five of the seven sites are risky, thus, described as partly stable, and the other two are unstable. The results have also implications for the understanding of the causal factors for slope instability, include the discontinuities present in the rock mass, physical, environmental, and meteorological factors influencing them. This study concludes that urgent remedial measures for their long-term stability are recommended.

Assessment of the extent of man-induced transformation of a subsoil block in upward mining using ore and host rock caving

2021 ◽  
pp. 113-118
Author(s):  
A.M. Mazhitov
Keyword(s):  
Rock Mass ◽  
Host Rock ◽  
Stress And Strain ◽  
Mining System ◽  
Ore Body ◽  
Ore Bodies ◽  
Ore Grades ◽  
The Stability ◽  
Host Rocks ◽  
Upward Mining

The study provides a geomechanical assessment of the man-induced transformation of the 1st block at the Kamaganskoye deposit when the mining system is changed to sub-level caving of the ore and host rocks with no possibility of changing the order of reserve extraction. The relevance of the research results from detailed exploration activities that revealed changes in the ore body boundaries and a decrease in the ore grades. The possibility of partial mining of blocks in ore bodies No. 16 and 17 using the ore and host rock caving system has been assessed and the possibility of retaining the upward mining sequence has been established. The sequence of room mining is defined taking into account the changes in the ore body boundaries. The paper presents the results of assessing the stability of the undermined masses of ore bodies No. 16 and 17, as well as the stress-andstrain state of the rock mass at the assumed sequence of room mining. The results of mathematical modeling of the rock mass stress-and-strain state during room mining using the ore and host rocks caving system proved the technical feasibility of this solution.

The Classification and Quality Evaluation of Rock-Mass Based on Limited Geological Information

2014 ◽  
Vol 580-583 ◽  
pp. 870-874
Author(s):  
Xiao Guang Wu ◽  
Zhi Qiang Yang ◽  
Qian Gao ◽  
Duo Heng Ba
Keyword(s):  
Rock Mass ◽  
Statistical Analysis ◽  
Quality Evaluation ◽  
Hanging Wall ◽  
Mining Area ◽  
Rock Properties ◽  
Block Caving ◽  
Rock Classification ◽  
Ore Body ◽  
Geological Information

This paper takes the No. 1 ore body of Jinchuan 3rd mining area as an example, obtains the corresponding relation of surrounding rock quality evaluation index and spatial location.Through RMR rock classification method , using Rockware modeling system and limited geological informations, the statistical analysis of RMR and RQD showed that the rock of No. 1 ore body belongs to III~V type. Its rock mass is between normal to unstable. Through Rockware modeling system, we established the 3D rock properties model of UCS, RQD and RMR, and found that in the 5 to 6 rows of east hanging wall exists rock not conducive to the block caving method which belongs to the type of V. Finally, Statistical analysis was made based on the numerical model of strata. We find that , basically ,the rock block has good cavability because it belongs to the IV type of rock masses. However when design blocks and manage drawing, we must pay particular attention to the III type of rock, which is of moderate stability, and the V type of rock, which is less stable. All of these make a useful exploration for the research of key technology in the field of the interior of the earth.

scholarly journals Study on the Deformation Mechanism of Soft Rock Roadway under Blasting Disturbance in Baoguo Iron Mine

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Hong-di Jing ◽  
Yuan-hui Li ◽  
Kun-meng Li
Keyword(s):  
Rock Mass ◽  
Deformation Mechanism ◽  
Soft Rock ◽  
Deformation Monitoring ◽  
Underground Mines ◽  
Blasting Vibration ◽  
Iron Mine ◽  
The Stability ◽  
Soft Rock Roadway ◽  
Rock Roadway

In order to study the deformation mechanism of soft rock roadway in underground mines, it is necessary not only to study the influence of the dynamic disturbance caused by the cyclic mining blasting vibration on the stability of the soft rock roadway but also to study the degradation of the roadway surrounding rock itself and other factors. The paper presented a synthetic research system to investigate the factors that influence roadway rock structure deterioration in Baoguo Iron Mine. Firstly, the stability of rock mass was analyzed from the perspective of the physical and structural characteristics of the rock mass. Afterwards, according to monitoring data of mining blasting vibration, a suitable safety blasting prediction model for Baoguo Iron Mine was determined. And then, combining the results of mining blasting vibration monitoring and deformation monitoring, the effect of cyclic mining blasting on the stability of the soft rock roadway was obtained. By systematically studying the intrinsic factors of rock quality degradation and external environmental disturbances and their interactions, this paper comprehensively explores the deformation mechanism of soft rock roadway and provides the support for fundamentally solving the large deformation problems of soft rock roadway in underground mines.

Hydro-Mechanical Coupled Analysis of the Stability of Surrounding Rock Mass of Underground Water-Sealed Oil Storage

2013 ◽  
Vol 405-408 ◽  
pp. 402-405 ◽  
Author(s):  
Yun Jie Zhang ◽  
Tao Xu ◽  
Qiang Xu ◽  
Lin Bu
Keyword(s):  
Rock Mass ◽  
Underground Water ◽  
Surrounding Rock ◽  
Comsol Multiphysics ◽  
Coupled Analysis ◽  
Coupling Theory ◽  
Oil Storage ◽  
Stability Of Surrounding Rock ◽  
Straight Wall ◽  
The Stability

Based on the fluid-solid coupling theory, we study the stability of surrounding rock mass around underground oil storage in Huangdao, Shandong province, analyze the stress of the surrounding rock mass around three chambers and the displacement change of several key monitoring points after excavation and evaluate the stability of surrounding rock mass using COMSOL Multiphysics software. Research results show that the stress at both sides of the straight wall of cavern increases, especially obvious stress concentration forms at the corners of the cavern, and the surrounding rock mass moves towards the cavern after excavation. The stress and displacement of the surrounding rock mass will increase accordingly after setting the water curtains, but the change does not have a substantive impact on the stability of surrounding rock mass.

Application of ABAQUS in Surrounding Rock Stability Analysis of Shallow Large Cross-Section Tunnel

2015 ◽  
Vol 777 ◽  
pp. 8-12 ◽  
Author(s):  
Lin Zhen Cai ◽  
Cheng Liang Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Strong Support ◽  
Surrounding Rock ◽  
Tunnel Engineering ◽  
Tunnel Excavation ◽  
Rock Stability ◽  
Rock Bolting ◽  
Excavation Support ◽  
The Stability

HuJiaDi tunnel construction of Dai Gong highway is troublesome, the surrounding-rock mass give priority to full to strong weathering basalt, surrounding rock integrity is poor, weak self-stability of surrounding rock, and tunnel is prone to collapse. In order to reduce disturbance, taking advantage of the ability of rock mass, excavation adopt the method of "more steps, short footage and strong support". The excavation method using three steps excavation, The excavation footage is about 1.2 ~ 1.5 m; The surrounding rock bolting system still produce a large deformation after completion of the first support construction, it shows that the adopted support intensity cannot guarantee the stability of the tunnel engineering. Using ABAQUS to simulate tunnel excavation support, optimizing the support parameters of the tunnel, conducting comparative analysis with Monitoring and Measuring and numerical simulation results, it shows that the displacement - time curves have a certain consistency in numerical simulation of ABAQUS and Monitoring and Measuring.

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