露天矿软弱基底排土场卸荷变形机制试验研究

doi:10.13722/j.cnki.jrme.2019.0518

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Abstract In order to systematically study the unloading deformation mechanisms of soft base waste dumps，taking the waste dump with a silty clay base of Dagushan Iron Mine as the research background，the deformation and failure processes of the waste dump under natural(hard base) and saturated(soft base) conditions are compared，and the displacement distribution and evolution law of the waste dump are acquired by speckle analysis and point tracking. The test results indicate that the stability of the soft base waste dump is obviously worse than that of the hard base waste dump. The deformation failure of the hard base waste dump shows a collapse-traction-push pattern，developing from the low-grade slope towards the high-grade slope，while due to the uneven unloading settlement between the front and back parts of the waste dump，the deformation failure of the soft base waste dump mainly controlled by the soft base presents a cycle of subsidence，breakage and slip until the failure of the whole slope above the soft base. Tension cracks in the hard base waste dump are caused by the uneven horizontal deformation while dislocation cracks in the soft base waste dump results from the uneven unloading settlement. It is suggested that dynamic consolidation and borehole grouting methods should be adopted to reinforce the soft base of the waste dump and，at the same time，a perfect drainage system should be built to reduce the softening of the base soil. The research results can provide reference for the research and treatment of unloading deformation of soft base dumps.

Key words： mining engineering soft base waste dump base friction test speckle analysis displacement field deformation mechanism

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	Articles by authors
	WANG Yukai1
	SUN Shuwei1
	2
	PANG Bo1
	LIU Liu1

Cite this article:

WANG Yukai1,SUN Shuwei1,2, et al.

Experimental study on unloading deformation mechanisms of soft base dumps of open-pit mines

[J]. , 2020, 39(2): 359-373.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0518 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I2/359

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