松动岩体工程特性研究——以雅砻江楞古水电站松动岩体为例

doi:10.13278/j.cnki.jjuese.20180189

Abstract

Abstract: In order to systematically study the engineering characteristics of loose rock masses, a detailed geological cataloging and physical prospect testing of the slope rock mass in the area of Lenggu hydropower station were carried out, and the spatial development law of joints and fissures, the development depth and spatial distribution of mosaic and cataclastic rock masses, and the weak structural planes were mainly studied. The systematic statistics and analysis were conducted on the development and distribution of rock masses and the deformation and failure characteristics of the slope. The results show that the rock mass engineering effect is poor,and the deformation modulus is low. The wave velocity of most loose rock masses is less than 3 000 m/s, the maximum principal stress is less than 20 MPa, and the permeability coefficient is greater than 10 L/(min·m·m). The evolution process and characteristics of rock mass fractures and loosening are analyzed combined with the experimental results of stress test, acoustic velocity measurement, and high density electromagnetic exploration. It is concluded that loose rock masses are the result of regional fracture activity and shallow transformation, and rock mass fractures are mainly affected by faults and joints.

Key words: dynamo-relaxed rock mass, engineering characteristics, unloading effect, rock mass quality

CLC Number:

P642.21

Wang Zilong, Pei Xiangjun, Zhang Yuyang, Zhang Shuo, Wei Xiaojia, Wang Shuang. Engineering Characteristics of Loose Rock Mass: Taking Loose Rock Mass of Lenggu Hydropower Station in Yalong River as an Example[J].Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1376-1388.

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Engineering Characteristics of Loose Rock Mass: Taking Loose Rock Mass of Lenggu Hydropower Station in Yalong River as an Example

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