Abstract When the expressway crosses the goafs inevitably, the design is generally to build the road on coal pillars as much as possible. However, the existing coal pillars are often unable to meet relevant requirements of highway construction. Combining three-dimensional physical model tests, numerical simulations and fi eld monitoring, with the Urumqi East Second Ring Road passing through acute inclined goafs as a background, the deformation and failure mechanism of the overlying rock and coal pillars in acute inclined goafs under expressway load were studied. And in accordance with construction requirements of subgrade, comprehensive consideration of the deformation and instability mechanism of acute inclined goafs, the treatment measures and suggestions for this type of geological disasters were put forward. The research results confirmed the rationality of coal pillars in acute inclined goafs under the expressway through grouting. According to the ratio of different overlying rock thickness to coal pillar height, the change trend and value of the required grouting range were summarized, which can provide reference for similar projects.
Fund: This study was supported by the Science and Technology Major Project of Xinjiang Uygur Autonomous Region (2020A03003-7); Fundamental Research on Natural Science Program of Shaanxi Province (2021JM-180); Fundamental Research Funds for the Central Universities, CHD (Project for Leading Talents) (300102211302); Tianshan Cedar Plan of Science and Technology Department of Xinjiang Uygur Autonomous Region (2017XS13); Shaanxi Province Young Talent Lifting Program (CLGC202219).
Corresponding Authors: Ma Zhi-Wei (Email: 2018121127@chd.edu.cn).
E-mail: 2018121127@chd.edu.cn
About author: Bao Wei-Xing Ph.D. professor and doctoral supervisor of School of Highway, Chang 'an University, graduated from Chang 'an University in 2009. He is mainly engaged in the teaching and research of geotechnical engineering of highways in special areas.
Phone: (+86) 15319955383;E-mail: baowx@chd.edu.cn
Cite this article:
. Deformation mechanism and treatment technology researchof coal pillars in acute inclined goafs under expressway[J]. APPLIED GEOPHYSICS, 2025, 22(1): 165-175.
2025, Vol. 22 
