The application of OVT domain processing technology in deep CBM exploration in Qinshui Basin

Authors

TIAN Zhongbin, Shanxi Province Coal Geology Geophysical Prospecting and Surveying and Mapping Institute, Jinzhong 030600, China; School of Geosciences and Info-physics, Central South University(CSU), Changsha 410083, China
LI Juan, Shanxi Province Coal Geology Geophysical Prospecting and Surveying and Mapping Institute, Jinzhong 030600, China
SHEN Youyi, Shanxi Province Coal Geology Geophysical Prospecting and Surveying and Mapping Institute, Jinzhong 030600, China
FENG Ajian, Shanxi Province Coal Geology Geophysical Prospecting and Surveying and Mapping Institute, Jinzhong 030600, China
YANG Xiaodong, Shanxi Province Coal Geology Geophysical Prospecting and Surveying and Mapping Institute, Jinzhong 030600, China

Abstract

The high concentration slurry is poured into the goaf to form filled piers. The bearing capacity of the piers to the superstructure are affected by the overlap size. In order to grasp the influence of the overlap size on the bearing capacity of the overlying rock layer, high concentration slurry was prepared which selected cement as the cementing material, standard sand as the aggregate. 3D printing technology was used to make the mold to produce the overlapped round table samples. The uniaxial compression test was carried out. Test results show that, when the top area and height of each single pier are the same, the smaller the accumulation angle is, the greater the ultimate bearing capacity is. The ultimate bearing capacity of overlapped two round table specimens with a stacking angle of 30 ° and a stacking angle of 45 ° is in the range of 2.0 to 3.5 times of the corresponding single round table specimen. After the specimen is hardened, the ultimate bearing capacity of the overlapped pier specimen increases first and then decreases as the overlap size increases. When piers filling are used to control the mined-out area, the spacing between the grouting holes should be reasonably set so that the injected slurry forms overlapping piers in large hollow goaf. The bearing capacity of overlapping pier group is better than that of evenly distributed single piers. When filling the goaf with an accumulation angle of 30° to overlap the piers and the distance between the grouting holes is the value corresponding to the limit overlap size of 38.5%, the overall bearing capacity in the treatment site is the largest. The results of this research will provide a basis for the actual use of high concentration slurry for partial filling and treatment of goaf.

Keywords

large hollow goaf, high concentration slurry, filled pier, overlap, the bearing capacity

DOI

10.3969/j.issn.1001-1986.2020.06.013

Recommended Citation

TIAN Zhongbin, LI Juan, SHEN Youyi, et al. (2020) "The application of OVT domain processing technology in deep CBM exploration in Qinshui Basin," Coal Geology & Exploration: Vol. 48: Iss. 6, Article 14.
DOI: 10.3969/j.issn.1001-1986.2020.06.013
Available at: https://cge.researchcommons.org/journal/vol48/iss6/14

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