Rock and Soil Mechanics ›› 2024, Vol. 45 ›› Issue (S1): 596-606.doi: 10.16285/j.rsm.2023.1615

• Geotechnical Engineering • Previous Articles     Next Articles

A method for controlling heightening rate and slope stability of waste dumps with soft soil base

GUO Xiao-gang1, 2, MA Lei1, 3, ZHANG Chao1, 2, GAN Shu-cheng1, WANG Hua4, GAN Yi-xiong5, ZHOU Tong6   

  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. Key Laboratory of Mine Slope Safety Risk Warning and Disaster Prevention and Mitigation, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China; 4. Dexing Copper Mine, Jiangxi Copper Co., Ltd., Dexing, Jiangxi 334224, China; 5. Chinese Institute of Coal Science, Beijing 100013, China; 6. Wushan Copper Mine, Jiangxi Copper Co., Ltd., Ruichang, Jiangxi 332204, China
  • Received:2023-10-27 Accepted:2024-02-06 Online:2024-09-18 Published:2024-09-21
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2021YFC3001305), the Key Project of China Coal Technology & Engineering Group (2022-ZD002) and the State Key Laboratory Program (SKLGME022023).

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Abstract: To control the stability of waste dump slopes with soft soil base during dumping and heightening process, the relationship between heightening rate and shear strength parameters of the soft soil is established, and a method for analyzing slope stability under different heightening rates is proposed. Based on a practical case, a series of quick shear tests for soft soil with different consolidation degrees is conducted. Results show that the internal friction angle gradually increases as a hyperbolic function with increasing degree of consolidation, while the cohesion remains almost constant. The evolution of consolidation degrees of soft soil layers under surcharge loading is studied using the finite element method and the hardening soil model. The relationships between consolidation duration, surcharge loading layer thickness, and strength parameters are established. Results indicate that a thicker soft soil layer has a lower internal friction angle under the same surcharge loading and consolidation duration. A lower surcharge loading results in a higher internal friction angle of the soft soil layer under the same consolidation duration. The slope failure mode changes from sliding along the base to sliding within the waste mass as the consolidation duration extends from 50 d to 100 d. Further extension of the consolidation duration has no effect on slope stability.

Key words: soft soil base, waste dump, heightening rate, consolidation degree, strength parameters, stability analysis

CLC Number: 

  • TU447
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