Numerical simulation and verification of the loose dumping limiting height

Journals

Title：
Numerical simulation and verification of the loose dumping limiting height
Author：
Gao-min Liu¹, You-liang zhang², Deng-xue Liu²
Author Affiliation：
1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China
2. University of Chinese Academy of Sciences, Beijing, China
Received：Apr.28, 2023
Accepted：May.25, 2023
Published：Jun.6, 2023

Abstract

Common deformation and intensity control theory systems for determining the waste dump limiting height ignore the influence of topsoil basal thickness. The research of Yan Rong-gui et al indicates that the interaction mechanism between flat base site and loose dumping is crucial to determine the waste dump limiting height. But there is hardly any correlation analysis of the numerical simulation. Connecting with project examples, firstly using the theoretical formula to determine the limiting height-(61-97) m. When considering the topsoil basal thickness, the value can be raised to 280m safely. Then establish the numerical model of thin topsoil basement case and thick overburden basement case for finite element simulation and verification, the results show that the effect of dump load mainly acts on the bedrock with the thin topsoil basement mainly transferring the load. The thick overburden basement bears the weight of the dump in the second case, and certainly the dump limiting height determines by the deformation and intensity control theory systems. Based on the strength reduction finite element method, we get safety factor consistent with the limit equilibrium analysis. The results of numerical simulation analysis not only verify the interaction mechanism between flat base site and loose dumping but further improve the algorithm for determination of waste dump limiting height, what's more, provides more scientific basis for extended using of this kind of idea, method and formula for determining waste dump limiting height. From another point of view, it also provides meaningful reference for mine disaster prevention and mitigation.

Keywords

Numerical analysis, the intensity control, the waste dump limiting height, critical thickness, super-high bench dumping-site, foundation loading.

Doi

https://doi.org/10.58396/cmce020104

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