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以某铀矿山中和后的堆浸尾渣为骨料,制备了渣浆体积分数为78%,80%和83%,灰渣比为1∶6,1∶8,1∶10,1∶15,1∶20,1∶25,1∶30的尾渣胶结充填料试样,经不同养护时间后,测定了它们的单轴抗压强度;建立了尾渣胶结充填体固化强度与养护时间的关系。结果表明,最终强度值、强度响应系数、强度增长稳定时间和初始强度(t=3)等力学参数能定量描述不同尾渣胶结充填体的强度随养护时间的变化特征。引入能量匹配系数表征岩体开挖释放比能与充填体变形比能关系,得到上向进路胶结充填采矿法中一步骤充填体固化时间与二步骤矿体回采时间匹配与矿岩容重、矿岩埋深、矿岩弹性模量、充填体灰渣比、渣浆体积分数和养护时间密切相关。采用某铀矿山工程实例验证了本研究结果。
Based on the heap leach tailings neutralized by a uranium mine, the volume fraction of the slurry was 78%, 80% and 83%, and the ash / slag ratio was 1: 6, 1: 8, 1:10, 1: 15,1:20,1:25,1:30 tailings cementation filler samples, after different curing time, their uniaxial compressive strength was measured; the tailings cemented filling body curing strength and curing time Relationship. The results show that the mechanical properties such as ultimate strength, strength response coefficient, strength growth and stabilization time and initial strength (t = 3) can quantitatively describe the variation of strength with curing time for different tailings cemented filling bodies. The energy matching coefficient was used to characterize the relationship between the ratio of rock release to specific energy and the deformability of backfill. The cementing time of one step of backfill and the backfiring time of two-step orebody were obtained. The rock depth, the elastic modulus of the rock, the filler ash ratio, the slurry volume fraction and the curing time are closely related. A uranium mine project is used to verify the results of this study.