露天排土场不同排土工艺失稳机制对比试验研究

doi:10.13722/j.cnki.jrme.2020.1195

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Abstract Dumping method is one of the key factors affecting the failure mechanism of waste dumps of open-pit mines. To reveal the failure mechanism of mine waste dumps with different dumping methods，a real waste dump was taken as a background and a series of base friction tests were conducted on four models. The failure process was comparatively analyzed through the graphical point-tracking technology. The results show that：(1) under the same base condition，the forwardly downslope dump has the highest stability level，followed by the forwardly covered dump，the reversely covered dump and the reversely downslope dump. (2) The block size of the waste material has a significant impact on the dump stability，and the stage mainly composed of small-size blocks is easier to collapse than that mainly composed of large-size blocks. (3) Failure mechanisms of waste dumps with different dumping methods are different. Exactly，the failure of the forward dumps mainly occurs at the upper and middle slope，among which the forwardly covered dump shows slip-cracking failure at the upper and middle stages while the forwardly downslope dump presents extrusion-slip failure in the upper and middle stages. In contrast，the failure of reverse dumps locates at the lower and middle slope，among which the reversely covered dump shows slip-cracking failure at the lower and middle stages but the reversely downslope dump shows slip-cracking-traction composite failure at the lower and middle stages with the largest damage area. The research results can provide reference and guidance for the stability evaluation of open-pit mine waste dumps and the selection of dumping methods.

Key words： mining engineering open pit mine waste dump base friction test dumping method failure mechanism

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	SUN Shuwei
	PANG Bo
	LIU Liu

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SUN Shuwei,PANG Bo,LIU Liu. Comparative tests on failure mechanisms of waste dumps of open-pit mines with different dumping methods[J]. , 2021, 40(8): 1713-1726.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1195 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I8/1713

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