›› 2016, Vol. 37 ›› Issue (8): 2373-2382.doi: 10.16285/j.rsm.2016.08.033

• Geotechnical Engineering • Previous Articles     Next Articles

Anisotropy of intact loess of Wangjiagou tunnel along Baoji-Lanzhou passenger dedicated line

WU Xu-yang1, 2, 3, LIANG Qing-guo3, NIU Fu-jun1, LI Chun-qing4, WANG Li-li5   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China; 4. School of Architectural Engineering, Qinghai Nationalities University, Xining, Qinghai 810007, China; 5. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration, Lanzhou, Gansu 730000, China
  • Received:2016-04-22 Online:2016-08-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (NSFC) (41262010), the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAG05B05) and the Foundation of Groups of Basic Innovation Research of Gansu Province (145RJIA332).

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Abstract: In view of the anisotropy of deformation and strength of surrounding rock at different locations(vault and hance) in loess tunnel, the anisotropy of intact loess with respect to structural strength is empatically discussed. The intact loess is sampled from Wangjiagou tunnel along Baoji-Lanzhou passenger dedicated line. A series of tests including shear test, unconfined compression test, tensile strength test are conducted on the intact loess with sampling directions of vertical and horizontal directions. Considering the influence of structure of loess on its anisotropy, the scanning electron microscope (SEM) test is also performed to analyze the main reasons leading to the anisotropy of intact loess. The results indicate that the strain ratio of horizontal direction to vertical direction decreases with the increasing of confined pressure, but firstly increases and then decreases with the increasing of normalized deviatoric stress; the peak (singularity) increases with normalized deviatoric stresses in the manner of power function. A geometric model of anisotropy of structural strength of intact loess is presented; and related strength parameters are also proposed.

Key words: intact loess, scanning electron microscope test, anisotropy, geometric model

CLC Number: 

  • TU 444

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