富水条件下露天坑回填体力学特性研究  

Study on Physical Properties of Backfilling of Open Pit Under Water-Rich Condition

作　　者：宫长亮 孙健 张建立 许译心 GONG Changliang;SUN Jian;ZHANG Jianli;XU Yixin

机构地区：[1]鞍钢集团矿业有限公司大孤山分公司,辽宁鞍山114046

出　　处：《中国矿山工程》2025年第1期32-37,共6页China Mine Engineering

摘　　要：为了研究露天坑回填排放施工时出现降雨和料浆回填后泌水情况对回填体强度影响的变化规律,以辽宁省鞍山市大孤山露天坑为工程背景,对2种不同料浆配比开展浸水试验和施加7种不同类型降雨量的淋雨试验,获取不同条件下回填体抗压强度及强度折减规律。研究结果表明:浸水时间为1 h时,回填体抗压强度下降最为明显,但随着浸水时间的增加,抗压强度折减幅度降低;降雨强度对回填体早期抗压强度(3 d、7 d)影响显著,降雨强度越大,回填体早期抗压强度折减程度越高,抗压强度越低;当连续3 d降雨量均超过7 mm/d时,需停止排放施工。In order to study the variation law of the influence of rainfall and slurry drainage on the strength of backfill during the construction of open pit backfill discharge,based on the engineering background of Dagushan open pit in Anshan City,Liaoning Province,two different slurry ratios were immersed in water tests and seven different types of rainfall were applied to obtain the compressive strength and strength reduction law of backfill under different conditions.The results show that when the immersion time is 1 h,the compressive strength of backfill decreases most obviously,but the reduction range of compressive strength decreases with the increase of immersion time.Rainfall intensity has a significant effect on the early compressive strength of the backfill body(3 d,7 d).The greater the rainfall intensity,the higher the reduction degree of the early compressive strength of the backfill body,and the lower the compressive strength.When the rainfall exceeds 7 mm/d for three consecutive days,the discharge construction should be stopped.

关 键 词：露天坑回填 浸水条件 淋雨条件 单轴抗压强度 

分 类 号：TD854[矿业工程—金属矿开采]