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Analysis of stress and failure in rock specimens with closed and open flaws on the surface

Frontiers of structural and Civil Engineering 2021年第5期15卷 1222-1237页

作者： Amin MANOUChEhRIAN pinnaduwa h.s.w.kulatilake school of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

The influence of closed and open surface flaws on the stress distribution and failure in rock specimens is *** finite element models are developed to simulate the compression tests on flawed rock *** simulated specimens include those with closed flaws and those with open flaws on the *** analyses are conducted to investigate the influences of the flaw inclination,friction coefficient and the confining stress on failure *** results show significant differences in the stress,displacement,and failure behavior of the closed and open flaws when they are subjected to pure compression;however,their behaviors under shear and tensile loads are *** to the results,when compression is the dominant mode of stress applied to the flaw surface,an open flaw may play a destressing role in the rock and relocate the stress concentration and failure *** presented results in this article suggest that failure at the rock surface may be managed in a favorable manner by fabricating open flaws on the rock *** insights gained from this research can be helpful in managing failure at the boundaries of rock structures.

关键词： surface flaw heterogeneity circular hole numerical modeling relative displacement

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Numerical study on rock failure around a tunnel destressed by a conceptualized notched technique

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Underground space 2022年第6期7卷 1086-1097页

作者： Amin Manouchehrian pinnaduwa h.s.w.kulatilake school of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

A destressing method for reducing the strainburst risk in burst-prone grounds is *** this method,the rock is destressed by cutting notches at the excavation ***,the concept of the proposed method is described both analytically and ***,the method is applied to a tunneling *** numerical models are built to study the destressing process and the failure mechanism around a circular *** show that when the notch is added to the model,the rock at the tunnel wall is destressed,and the stress concentration zones shift to a farther distance away from the ***,the analysis of the failure zone around the tunnel and the velocity of the failed elements show that the failure in the notched tunnel is less violent compared to that in the tunnel without the ***,a parametric study is conducted to investigate the influences of the notch dimensions on the stress distribution,deformation,and failures around the tunnel.

关键词： strainburst Destressing Deep excavation Notched tunnel Rock violent failure

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stress and deformation analysis of gob-side pre-backfill driving procedure of longwall mining:a case study

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International Journal of Coal science & Technology 2021年第6期8卷 1351-1370页

作者： Rui wu Penghui Zhang pinnaduwa h.s.w.kulatilake hao Luo Qingyuan he school of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China state Key Laboratory of Coal Resources and safe Mining School of MinesChina University of Mining and TechnologyXuzhou 221116China

At present,non-pillar entry protection in longwall mining is mainly achieved through either the gob-side entry retaining(GER)procedure or the gob-side entry driving(GED)*** GER procedure leads to difficulties in maintaining the roadway in mining both the previous and current panels.A narrow coal pillar about 5-7 m must be left in the GED procedure;therefore,it causes permanent loss of some *** gob-side pre-backfill driving(GPD)procedure effectively removes the wasting of coal resources that exists in the GED procedure and finds an alternative way to handle the roadway maintenance problem that exists in the GER *** FLAC^(3D) software was used to numerically investigate the stress and deformation distributions and failure of the rock mass surrounding the previous and current panel roadways during each stage of the GPD procedure which requires"twice excavation and mining".The results show that the stress distribution is slightly asymmetric around the previous panel roadway after the"primary excavation".The stronger and stiffer backfill compared to the coal turned out to be the main bearing body of the previous panel roadway during the"primary mining".The highest vertical stresses of 32.6 and 23.1 MPa,compared to the in-situ stress of 10.5 MPa,appeared in the backfill wall and coal seam,*** the"primary mining",the peak vertical stress under the coal seam at the floor level was slightly higher(18.1 MPa)than that under the backfill(17.8 MPa).After the"secondary excavation",the peak vertical stress under the coal seam at the floor level was slightly lower(18.7 MPa)than that under the backfill(19.8 MPa);the maximum floor heave and maximum roof sag of the current panel roadway were 252.9 and 322.1 mm,*** the"secondary mining",the stress distribution in the rock mass surrounding the current panel roadway was mainly affected by the superposition of the front abutment pressure from the current panel and the side abutment p

关键词： Gob-side pre-backfill driving procedure Floor heave Roadway stability stress distribution Abutment pressure

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sTOChAsTIC ThREE DIMENsIONAL JOINT GEOMETRY MODELING INCLUDING A VERIFICATION TO AN AREA IN sTRIPA MINE,swEDEN

STOCHASTIC THREE DIMENSIONAL JOINT GEOMETRY MODELING INCLUDI...

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The International Congress

作者： pinnaduwa h.s.w.kulatilake Deepa N.wathugala Ove stephansson Department of Mining and Geological Engineering University of Arizona TucsonArizonaU.S.A. Department of Mining and Geological Engineering University of Arizona TucsonArizonaU.S.A. Division of Rock Mechanics Lulea University of Technology LuleaSweden

＜正＞At present,a three dimensional Joint geometry modelling scheme which investigates statistical homogeneity,incorporates corrections for sampling biases and applications of stereological principles,and,also includes a formal verifica- tion procedure is not available in the *** paper shows development of 3D joint geometry models with aforementioned *** data from stripa mine were used in the *** performed so far has indicated the need to try out different schemes in modelling Joint geometry parameters and to con- sider a number of combinations of such schemes in order to arrive at a realistic 3D joint geometry model which provides a good comparison with field data during *** verification studies are recommended to check the validity of the suggested modelling schemes.

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3-D discontinuum numerical modeling of subsidence incorporating ore extraction and backfilling operations in an underground iron mine in China

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International Journal of Mining science and Technology 2017年第2期27卷 191-201页

作者： huang Gang kulatilake pinnaduwa h.s.w. shreedharan srisharan Cai sijing song hongqing school of Resources and Environmental Engineering Wuhan University of Technology school of Civil and Environmental Engineering University of Science and TechnologyBeijing Rock Mass Modeling and Computational Rock Mechanics Laboratories University of Arizona

An underground iron mine in China has been used as a case-study to research the subsidence due to ore extraction and backfilling during open stoping operations. A 3-D discontinuum numerical model was built incorporating geologic complexities including faults and interfaces between different lithologies,and the stoping and backfilling sequence adopted from the mine plans. The stoping was carried out in two vertically stacked horizontal layers, with a total of 16 stopes. Large displacements of up to 50 cm were observed along the roof of the stopes, and a maximum surface subsidence of 22.5 cm was *** was found to eliminate subsequent displacements and subsidence. The extraction of the upper orebody was found to influence displacements in the lower orebody. Finally, a subsidence profile was constructed to show the subsidence at all locations along the length of the surface and region of influence on the surface.

关键词： Underground iron mine Discontinuum numerical modeling Open stoping Backfill subsidence

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