露天矿排土场土工格栅加固机制试验研究

doi:10.13722/j.cnki.jrme.2022.0087

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Abstract A series of base frictional tests were conducted to study the failure process of mine waste dump reinforced with geogrid under various conditions. By the image speckle analysis and point-tracking technology，the displacements and strains of mine waste dump were obtained，and the failure mode，stability of the dump and mechanism of the geogrid were analyzed. The results show：(1) When there is no geogrid or the length of the grogrid is insufficient，the mine waste dump will suffer deep failure，showing an integral arc sliding from bottom to top. When the full-length geogrid is used，the failure mode of the dump changes from the overall failure to local failure，and the shear effect of the shallow layer of the slope becomes more significant when the bench slope is steeper. (2) The deformation process of the dump can be divided into three stages. The first stage is the uniform deformation stage，and the displacement of the measuring points is small. The second stage is the deformation localization stage，in which some measuring points produce displacement acceleration and slip crack forms inside the model. The third stage is the failure stage，where the displacement of the measuring point shows a bifurcation phenomenon. To be specific，the displacement of the measuring point of the sliding body continues to increase，while the displacement of the measuring point in the stable body tends to be constant. The geogrid has a significant control effect on the deformation of the dump. (3) The initial cracking time and local failure time are taken as the evaluation index to study the stability of geogrid-reinforced dump. The geogrid can be used not only to improve the dump stability，but also to expand the volume of the dump. Taking Model A1 and B1 in this study as examples，the dump expands the volume by about 6.33% with geogrid reinforcement under the promise of ensuring stability. (4) For high and steep dumps with weak foundations，we recommend using full-length geogrid；however，for dumps with fine foundations and smaller heights，the length of geogrid can be reduced to save costs according to the practice. The results have guiding significance for the stability and expansion of the dump and saving the land area of the mining area.

Key words： mining engineering open-pit dump base friction test failure mode geogrid reinforcement mechanism

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	Articles by authors
	SUN Shuwei
	PANG Bo
	LIU Liu
	YANG Zhaoxi

Cite this article:

SUN Shuwei,PANG Bo,LIU Liu, et al. Experimental research on reinforcement mechanism of geogrid in open-pit dump[J]. , 2022, 41(11): 2320-2336.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0087 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I11/2320

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