Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (4): 1247-1258.doi: 10.16285/j.rsm.2019.0717

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of microstructure and mechanical properties of semi-diagenetic rock of Xigeda Formation

DU Yu-xiang1, 2, SHENG Qian1, 2, WANG Shuai3, FU Xiao-dong1, 2, LUO Hong-xing4, 5, TIAN Ming4, 5, WANG Li-wei1, 6, MEI Hong-ru1, 7   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei 430010, China; 4. Yunnan Dayong Highway Construction Company Limited, Dali, Yunnan 671000, China; 5. Yunnan Communications Investment & Construction Group Co., Ltd., Kunming, Yunnan 650200, China; 6. School of Architecture & Civil Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China; 7. College of Civil Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China
  • Received:2019-04-21 Revised:2019-07-07 Online:2020-04-11 Published:2020-07-01
  • Supported by:
    This work was supported by the Traffic Science, Technology and Education Project of Yunnan Province ([2017] 33), the National Natural Science Foundation of China (U1402231) and the National Natural Science Foundation of China (51779250).

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Abstract: In this study, semi-diagenetic rock specimens of the Xigeda Formation in Zhaizi village on Jinshajiang River were investigated. The mineral composition of the specimens was determined by X-ray diffraction (XRD), and the microstructure and change of mineral particles in natural and saturated states were observed by scanning electron microscopy (SEM). The influences of water and confining pressure on the strength and deformation of semi-diagenetic rock of Xigeda Formation were determined using triaxial compression test. And the microcosmic mechanism was also discussed. The strength characteristics of the semi-diagenetic rocks of Xigeda Formation different from that of the soil and the soft rock were revealed by statistical analysis of the relationship between the strength indexes and water content of rock, soil and soft rock. On the basis, engineering classification suggestions for the semi-diagenetic rocks of Xigeda Formation were given. Based on the above research, some conclusions are as follows. 1) The microstructure shows that the semi-diagenetic rock of Xigeda formation has weak cementitious structure which is obviously different from that of soil and rock. The cementation structure is easy to be destroyed after saturation. 2) The cohesion and friction angle of semi-diagenetic rock decrease with the increase of water content. The average modulus increases with the increase of confining pressure at high water content, it decreases with the increase of moisture content when the confining pressure is constant. 3) The order of cohesion is soft rock> semi-diagenetic rock of Xigeda Formation>soil. The sensitivity of the cohesion to the water content is soft rock> semi-diagenetic rock of Xigeda Formation>soil. The sensitivity of the friction angle to the water content is soil > semi-diagenetic rock of Xigeda Formation> soft rock. 4) The rocks or soils should be classified as hard soil-soft rock, with the uniaxial compressive strength between 0.2 and 3 MPa, and cohesion between 30 and 200 kPa, measured from a standard specimen (Φ 50 mm×100 mm). It is suggested that it should be distinguished from rock and soil in practical engineering application.

Key words: Xigeda, semi-diagenetic rock, water content, microstructure, strength deformation index, engineering classification

CLC Number: 

  • TU 43
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