摘要
矿渣堆排是矿业的必要环节,堆排前须清楚矿渣的工程性质,为堆排设计提供依据。攀枝花市某渣场堆体为钛白石膏渣,因工程性质不明确导致存在滑坡隐患,因此明确该矿渣工程性质对改进堆排工艺和消除隐患起着重要作用。试验结果表明该矿渣透水性弱(渗透系数Kv=30.3×10^(-6)cm/s),含水率高(ω=84.7%),重塑后基本呈淤泥状;原位测得内聚力c=27.2 kPa,内摩擦角φ=22.7°,室内重塑矿渣剪切试验测得c=14.0 kPa,φ=10.3°,表明钛白石膏渣重塑后抗剪强度大幅降低。强度折减法计算结果表明矿渣抗剪强度参数降低至重塑值时1 260~1 270 m平台之间坡体稳定性系数Kf=0.998(不稳定)。地震作用可能将1 220~1 260 m之间堆体的抗剪强度参数降低至重塑值,引发整体滑坡,因此计算堆体在重塑状态的稳定性是必要的。计算发现重塑状态堆体Kf=1.027(欠稳定),存在滑坡隐患。针对钛白石膏渣透水性弱,含水率高的特点,提出通过在矿渣中掺砂来改善排水条件,提高抗剪强度的措施,Kv从30.3×10^(-6)cm/s(弱透水层)提高至105.4×10^(-6)cm/s(中等透水层),ω从84.7%降至50.5%。c从14.0 kPa提升至18.2 kPa,φ从10.3°提升至17.4°。未掺砂继续堆排后Kf=1.039(欠稳定),掺砂继续堆排后提高至1.060(基本稳定),证明堆排工艺改进的有效性,为类似特殊矿渣堆排提供一定参考。
Slag heap discharge is a necessary link in mining industry.The engineering properties of slag must be clear before heap discharge,so as to provide a basis for heap discharge design.The slag in a slag field in Panzhihua City is titanium white gypsum slag,which has hidden danger of landslide because of unclear engineering properties,so it is important to clarify the engineering properties of the slag to improve the process of heap discharge and eliminate hidden danger.The research results show that the slag has weak water permeability(permeability coefficient Kv=30.3×10^(-6) cm/s),high water content(ω=84.7%),and is basically silty after remodeling.In situ cohesion c=27.2kPa,internal friction Angleφ=22.7°,and in indoor shear test of reshaped slag c=14.0kPa,φ=10.3°,indicating that the shear strength of titanium white gypsum slag after reshaping is significantly reduced.The results of strength reduction method show that the slope stability coefficient Kf=0.998(unstable)between 1260~1270 m platform when the shear strength parameter of slag decreases to the remodeled value.The seismic action may reduce the shear strength parameters of the reactor between 1220 and 1260 m to the remodeled value,resulting in the overall landslide,so it is necessary to calculate the stability of the reactor in the remodeled state.It is found that Kf=1.027(unstable)in the reconstructed reactor,which has potential landslide.According to the characteristics of weak water permeability and high-water content of titanium white gypsum slag,the measures to improve drainage conditions and improve shear strength are put forward by mixing sand in the slag.The Kv is increased from 30.3×10^(-6) cm/s(weak water permeable layer)to 105.4×10^(-6) cm/s(medium water permeable layer),andωis reduced from 84.7%to 50.5%.c increased from 14.0 kPa to 18.2 kPa,φincreased from 10.3°to 17.4°.The Kf=1.039 was understability after continuous stacking and discharge without sand,and increased to 1.060(basically stable)after continuous stacking and discharge with sand,which proves the effectiveness of the improvement of stacking and discharge process,and provides a certain reference for similar special slag heap discharge.
作者
伍小刚
朱锐杰
周世文
李彦彬
WU Xiaogang;ZHU Ruijie;ZHOU Shiwen;LI Yanbin(No.135 Geological Team,Sichuan Coal Geology Bureau,Luzhou,Sichuan 64600)
出处
《四川地质学报》
2024年第2期260-266,共7页
Acta Geologica Sichuan
关键词
钛白石膏渣
工程性质
稳定性
堆排工艺改进
titanium white gypsum slag
engineering nature
stability
stack process improvement