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Engineering Geological Investigation and Quality Evaluation of Soft Fractured Rock

JIANG Feifei1，2，LI Xiangdong1，2，SHENG Jia1，2，ZHANG Caiqing3#br#   

  1. 1.Changsha Institute of Mining Research Co.，Ltd.，Changsha   410012，Hunan，China；
    2.National Engineering Research Center for Metal  Mining，Changsha   410012，Hunan，China；
    3.Songxian Qianhe Mining Industry Co.，Ltd.，Songxian   471433，Henan，China
  • Received:2015-07-12 Revised:2015-09-06 Online:2016-06-28 Published:2016-10-08

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Abstract:

Reasonable engineering geological investigation and rock quality evaluation is the basis of design，construction and mining activities in underground engineering，aiming at the type of soft fractured rock in Qianhe gold mine，based on the fully understanding of the mine geology，current mining situation and characteristics of soft rock，investigated and analysed the engineering geological of soft fractured rock in detail with scan line method，which is suitable for the characteristics of soft rock and the mine’s actual situation，and used the MRMR-2000 system and Q system to evaluate the rock mass quality of orebody，hanging wall and footwall rock mass separately.The result shows that the structural plane in orebody and its surrounding rock are extraordinarily growing，they are contain more than 3 groups of preferred structure plane，and the average line density of them are more than 25 lines per meter；orebody and its surrounding rock are classified asⅤ，and the overall evaluation of rock quality are bad，of which the footwall rock mass is relatively and slightly better，the hanging wall rock mass takes the second place，and the orebody is the worst.

Key words: soft fractured rock, engineering geological investigation, MRMR-2000 rating system, rock quality evaluation

CLC Number: 

  • TU452 

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