scholarly journals THE EFFICIENCY TEST OF A NEW TRENCH EXCAVATOR FOR SOFT ROCK MASS BY USE OF A SPEED CONTROL TYPE EDGE EXCAVATION SYSTEM

2006 ◽  
Vol 62 (2) ◽  
pp. 296-311
Author(s):  
Tatsuro MURO ◽  
Takahisa SHIGEMATSU ◽  
Koichi KOHNO ◽  
Yoichi SAKUHARA
Keyword(s):  
Rock Mass ◽  
Soft Rock ◽  
Speed Control ◽  
Efficiency Test

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.

scholarly journals Research on Deformation Mechanisms of a High Geostress Soft Rock Roadway and Double-Shell Grouting Technology

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Fengnian Wang ◽  
Shizhuang Chen ◽  
Pan Gao ◽  
Zhibiao Guo ◽  
Zhigang Tao
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Large Deformation ◽  
Coal Mine ◽  
Soft Rock ◽  
In Situ Stress ◽  
Deformation Monitoring ◽  
Deformation And Failure ◽  
Working Face ◽  
High Geostress

In this study, the deformation characteristics and mechanical properties of coal and rock mass in the S2N5 working face of the Xiaokang coal mine are analyzed to address the problem of large deformation of soft rocks with high in situ stress surrounding roadways. Through a newly developed grouting pipe, a double-shell grouting technology, consisting of low-pressure grouting and high-pressure split grouting, is proposed for the Xiaokang coal mine. In addition, the effect of grouting is evaluated by borehole peeping and deformation monitoring. The results show that the double-shell grouting technology can effectively improve the overall mechanical properties of the surrounding coal and rock mass, preventing the large deformation and failure of the roadway. This technology can be useful when analyzing and preventing large deformation of soft rock roadways.

scholarly journals Impact of weathering on slope stability in soft rock mass

2014 ◽  
Vol 6 (3) ◽  
pp. 240-250 ◽  
Author(s):  
Predrag Miščević ◽  
Goran Vlastelica
Keyword(s):  
Rock Mass ◽  
Slope Stability ◽  
Soft Rock

Stability Analysis about the Impact of Soft Rock to the Underground Cavern Group

2013 ◽  
Vol 706-708 ◽  
pp. 560-564
Author(s):  
Yi Huan Zhu ◽  
Guo Jian Shao ◽  
Zhi Gao Dong
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Stability Analysis ◽  
Soft Rock ◽  
Element Model ◽  
Underground Excavation ◽  
Power Station ◽  
Excavation Process ◽  
The Stability ◽  
The Impact

Soft rock is frequently encountered in underground excavation process. It is difficult to excavate and support in soft rock mass which has low strength, large deformation and needs much time to be out of shape but little time to be self-stabilized. Based on a large underground power station, finite element model analysis was carried out to simulate the excavation process and the results of displacement, stress and plasticity area were compared between supported and unsupported conditions to evaluate the stability of the rock mass.

scholarly journals Experimental study on excavation forces of bucket shovel against soft rock mass.

1993 ◽  
pp. 73-81
Author(s):  
Tatsuro MURO ◽  
Rvoichi FUKAGAWA ◽  
Hiroaki WATANABE
Keyword(s):  
Experimental Study ◽  
Rock Mass ◽  
Soft Rock

scholarly journals Wear life and excavation forces of a hard metal bit against a soft rock mass.

1993 ◽  
pp. 75-83
Author(s):  
Tatsuro MURO ◽  
Kiyosi TUCHIYA ◽  
Yoshimi HARAMAKI ◽  
Masahiro YAMAMOTO
Keyword(s):  
Rock Mass ◽  
Soft Rock ◽  
Hard Metal ◽  
Wear Life

scholarly journals Characterization of Weathered Soft Rock Mass by Index Tests

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Fernandes Leão M
Keyword(s):  
Rock Mass ◽  
Soft Rock ◽  
Point Load ◽  
Load Test ◽  
Rock Properties ◽  
Morphological Description ◽  
Durability Test ◽  
Stability Issues ◽  
Weathering Zone

The understanding of geotechnical and geomechanical rock mass behavior is challenging, mainly regarding weathered parts, since they may trigger stability issues. Soft Rocks, as phyllite, are known to enhance these problems. In this case, a road cut on a highway between the cities of Ouro Preto and Mariana (MG – Brazil) was studied, showing a particular weathering zone with changing conditions. After morphological description and geological fragmentation (using geological hammer, the Schmidt hammer and a switchblade) of the weathering zone, tests were done on rock matrix and rock mass in order to identify the discontinuity features. Physical properties were determined by physical index, using the point load test and slake durability test. The results permit to define the weathering zone, showing some huge anisotropy and heterogeneity in the rock properties.

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