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应用研究·非煤矿山 Study on the Micro Macro Physical and Mechanical of Properties of Yangjialing ShaleHuang JieHai, Li XiaoLong, Hu GuoQing, Zhang WenYuan, Zheng LiuGen, Zhao Tian, Jiang ChunLu
There is a landslide at an elevation of 150m on the north slope of the Yangjialing mining area, which has caused significant damage and deformation to safety pr...
应用研究·非煤矿山 Sensitivity Analysis of Influencing Factors of Pillar Stability Based on Rough Set TheorySun WenYong, Wang Ming
Pillar stability is the premise of safe and efficient mining in mines. It is of great significance to study the factors affecting the stability of pillars and t...

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应用研究·非煤矿山

Study on the Micro Macro Physical and Mechanical of Properties of Yangjialing Shale
Huang JieHai, Li XiaoLong, Hu GuoQing, Zhang WenYuan, Zheng LiuGen, Zhao Tian, Jiang ChunLu

2023,52(6):6-11, DOI:

Abstract(27) HTML(0) PDF(4.18 M)( 146) Collect

Abstract:

There is a landslide at an elevation of 150m on the north slope of the Yangjialing mining area, which has caused significant damage and deformation to safety production. The landslide rock belongs to the Gufeng Formation shale. In order to explore the macroscopic and microscopic failure mechanisms of the rock, using X-ray powder diffraction, scanning electron microscopy, MTS816 electro-hydraulic servo control testing machine to study it. The experimental results show that the shale in the study area is mainly composed of detrital mineral quartz and clay mineral illite, a small amount of chlorite and kaolinite, and the rocks have a certain degree of water absorption; The whole interior of siliceous shale is flaky structure, containing pores with a diameter of approximately 0.61~4.01μm,and primary cracks with a length of approximately 1.09~2.95μm. Under uniaxial compression, the compressive strength and elastic modulus of rocks increase exponentially with the increase of loading rate. At low loading rates, shale has a significant yield stage and the failure mode is brittle tensile failure; Under triaxial compression, the average compressive strength of shale decreased by 15.31% to 20.40%, and the cohesion decreased by about 16.57%. Confining pressure can improve the compressive strength of saturated shale, which mainly occurs brittle shear failure with a failure angle of about 67.38°; The damage strength and peak strain of rocks are most significantly affected by confining pressure, and the sensitivity of their strength to confining pressure is in the order of damage strength＞peak strength＞initiation strength. The research results indicate that the mineral composition and microstructure of shale in the study area may be the main reasons inducing its macroscopic failure.

Sensitivity Analysis of Influencing Factors of Pillar Stability Based on Rough Set Theory
Sun WenYong, Wang Ming

2023,52(6):1-5, DOI:

Abstract(32) HTML(0) PDF(850.02 K)( 206) Collect

Abstract:

Pillar stability is the premise of safe and efficient mining in mines. It is of great significance to study the factors affecting the stability of pillars and their sensitivity for the safety management of pillars. In this paper, a method for analyzing the influencing factors of pillar stability based on rough set theory is proposed, and a manganese ore room-and-pillar mining stope in Sichuan Province is taken as the research object. Firstly, the influencing factors of pillar stability were analyzed. Then, the sensitivity analysis of each influencing factor is carried out by using rough set theory, and the importance of each influencing factor to pillar stability is calculated. The results show that the importance of room width is 0.381, which has the most significant effect on the stability of pillar. The method is objective and effective for the sensitivity analysis of the influencing factors of pillar stability, which can provide theoretical basis for the safety management of mine pillar and the optimization of pillar size.

About

Governing Body：China Nonferrous Metal Industry Association

Organizer：China Nonferrous Engineering Co., Ltd.

CN：11-5068/TF

ISSN：1672-609X

Publish Date：1972

Publishing Cycle：Bimonthly

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Zip Code：100038

Phone：010-63936592

Email：zgksgc@sohu.com