›› 2013, Vol. 34 ›› Issue (6): 1536-1540.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Stability analysis of red sandstone bedding slope under rainfall infiltration and dry-wet cycling

ZENG Sheng1, LI Zhen-cun1, 2, WEI Hui1, GUO Xin1, WANG Jian1   

  1. 1. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410004, China; 2. Key Laboratory of Highway Engineering of Ministry of Education, Changsha University of Science and Technology, Changsha 410004, China
  • Received:2012-12-14 Online:2013-06-10 Published:2013-06-14

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Abstract: According to the stability of red sandstone bedding rock slope, a mechanical model is established; the hydraulic effect on slope under rainfall infiltration is calculated. Selecting a typical structural plane, through dry-wet cycling test, strength attenuation law of structural plane is analyzed. Comprehensive considering the rainfall infiltration and dry-wet cycling, the stability analysis of red sandstone bedding slope is analyzed; and the stability attenuation law is achieved. At last, by slope stability monitoring of Yan-Ru expressway, theoretical calculation results are verified. The results show that the hydraulic action is proportional to the water height in rock crack. Under dry-wet cycling, the cohesion of structural surface decays in the form of power function; and the internal frictional angle decays in the form of quadratic function. The slope stability has linear relationship with water height in rock crack and exponential relationship with dry-wet cycling. The dry-wet cycling has a greater influence on slope stability than that on water height in rock crack. Under the combined action of rainfall infiltration and dry-wet cycling, slope stability coefficient reduces by about 66%. Compared with considering single influence factor, the stability coefficient attenuation range has a great increase. The slope stability monitoring results agree well with theoretical results, the validity of theoretical results is further proved.

Key words: rainfall infiltration, dry-wet cycling, red sandstone bedding slope, stability analysis, deterioration law

CLC Number: 

  • U 416.1
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