尾砂压缩固结特性试验及e-P曲线模型分析研究  

Experimental Research on Compressibility and Consolidation Characteristics of Tailings and e—P Curve Model Analysis

作　　者：梁冰[1] 王堃[2] 姜利国[1] 董擎[1] 王俊光[1] LIANG Bing;WANG Kun;JIANG Liguo;DONG Qing;WANG Junguang(School of Mechanics＆Engineering, Liaoning Technical University, Fuxin 123000, China;School of Mines, Liaoning Technical University, Fuxin 123000, China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《防灾减灾工程学报》2018年第1期109-117,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金面上项目(51574145);国家自然科学基金青年基金项目(51404130)资助

摘　　要：为探索压实度K和含水率ω对铅锌尾砂压缩固结特性的影响,采用WG三联高压固结仪对铅锌尾砂开展了标准固结试验,基于修正后的e—P曲线分析模型来分析铅锌尾砂的压缩固结特性。结果表明：（1）压缩系数av1-2随K增大而减小。当ω〈ωopt时,av1-2在0.034-0.092 MPa-1间波动;当ω≥ωopt时,av1-2随ω增大而增大。ω≥15%时,尾砂属中压缩性土;ω〈15%时,尾砂属低压缩性土。（2）固结系数Cv随K增大而降低,随ω增大而先增大后减小,ω=9%时Cv最大。（3）修正了e—P模型并优化模型参数,验证了模型的正确性与合理性。该研究结果为尾矿库（坝）的稳定性分析提供了试验和理论基础,为尾矿库的安全运行与回采利用提供科学依据。To investigate the influence of bulk factor（K）and moisture content（ω）on the compressibility and consolidation characteristics of lead-zinc tailings,the WG triple high-pressure consolidation apparatus was adopted to carry out standard oedometer tests on lead-zinc tailings.The characteristics of compressibility and consolidation of lead-zinc tailings were analyzed based on the modified e—Pcurve analysis model.The results indicate that：（1）the compression coefficient av1-2 decreases as K increases.Whenωωopt,av1-2 fluctuates between 0.034 MPa-1 and0.092 MPa-1;Whenω≥ωopt,av1-2 increases asωincreases.Whenω≥15%,the tailings are categorized as compressible soil.Coefficient of consolidation Cvdecreases as Kincreases and with the increase ofω,it increases first and then reduce.Whenω=9%,Cvreaches maximum.The e—P model is modified and the model parameters are optimized.The correctness and rationality of the model is verified.The research results provide experimental and theoretical basis for stability analysis of tailings ponds,which provides a scientific reference for the safe operation and recycling of tailings ponds.

关 键 词：铅锌尾砂 标准固结试验 压缩固结特性 e—P曲线模型 

分 类 号：TU443[建筑科学—岩土工程]