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充填体和围岩-充填体界面剪切特性对比试验研究 被引量:8
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作者 修占国 王述红 +2 位作者 王斐笠 任凤玉 NGUYEN Vantuan 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2021年第8期1628-1642,共15页
拱效应理论模型在剪切力学参数(黏聚力c和内摩擦角j)的选取上采用了等效原则。为了区分剪切参数的选取对拱效应理论模型的影响,首先,采用三轴测试方法,开展常侧向约束条件下围岩-充填体界面的三轴剪切和充填体的三轴压缩试验。基于Mohr-... 拱效应理论模型在剪切力学参数(黏聚力c和内摩擦角j)的选取上采用了等效原则。为了区分剪切参数的选取对拱效应理论模型的影响,首先,采用三轴测试方法,开展常侧向约束条件下围岩-充填体界面的三轴剪切和充填体的三轴压缩试验。基于Mohr-Coulomb强度理论框架,对不同养护时间下充填体和围岩-充填体界面的剪切力学参数进行对比和量化分析。然后,利用电子扫描电镜(SEM)和热差异分析(TG/DTG)的分析手段,充分解释充填体和围岩-充填体界面剪切参数的差异性。最后,依据试验测试结果,对Terzaghi理论模型的工程应用进行讨论。研究表明,随侧向约束的增加,围岩-充填体界面的剪切位移-剪切应力曲线呈现出多峰值现象,且充填体的轴向应变-偏应力曲线呈现出明显的弹性强化阶段。充填体的剪切力学参数(c_(b),φ_(b))要明显大于相应围岩-充填体界面的参数(c_(i),φ_(i))。两者的黏聚力比值(c_(b)/c_(i))相差了2.26~2.67倍,内摩擦角比值(φ_(b)/φ_(i))相差了1.65~2.76倍。且采用围岩-充填体界面的剪切参数(c_(i),φ_(i))进行充填采场竖向应力(σ_(v))的预估能有效地克服Terzaghi理论模型的局限性。研究结论可为充填采场拱效应的预估和数值分析中力学参数的选取提供一定的参考。 展开更多
关键词 采矿工程 膏体充填体 围岩-充填体界面 三轴试验 剪切力学参数 Terzaghi理论模型
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Mill tailings based composites as paste backfill in mines of U-bearing dolomitic limestone ore 被引量:1
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作者 Sandeep Panchal Debasis Deb T.Sreenivas 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2018年第2期310-322,共13页
This paper elaborates on the development of paste backfill using mill tailings generated during the processing of a uranium ore deposit hosted in dolomitic limestone. The tailings have been characterized in terms of t... This paper elaborates on the development of paste backfill using mill tailings generated during the processing of a uranium ore deposit hosted in dolomitic limestone. The tailings have been characterized in terms of the physical, chemical and mineralogical properties. Time-dependent rheological behaviors and geotechnical properties of cemented paste backfill(CPB) are also determined. The studies show that the mill tailing has the potential to form paste and the CPB has adequate strength to provide support to mine pillars, roofs, and walls. 展开更多
关键词 Mining engineering Uranium ore deposit TAILINGS cemented paste backfill(cpb) Rheology Compressive strength
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Stability analysis of shallow tunnels subjected to eccentric loads by a boundary element method 被引量:7
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作者 Mehdi Panji Hamid Koohsari +2 位作者 Mohammad Adampira Hamid Alielahi Jafar Asgari Marnani 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2016年第4期480-488,共9页
This paper presents the results of the shear strength(frictional strength) of cemented paste backfillcemented paste backfill(CPB-CPB) and cemented paste backfillerock wall(CPB-rock) interfaces. The frictional be... This paper presents the results of the shear strength(frictional strength) of cemented paste backfillcemented paste backfill(CPB-CPB) and cemented paste backfillerock wall(CPB-rock) interfaces. The frictional behaviors of these interfaces were assessed for the short-term curing times(3 d and 7 d) using a direct shear apparatus RDS-200 from GCTS(Geotechnical Consulting & Testing Systems). The shear(friction) tests were performed at three different constant normal stress levels on flat and smooth interfaces. These tests aimed at understanding the mobilized shear strength at the CPB-rock and CPB-CPB interfaces during and/or after open stope filling(no exposed face). The applied normal stress levels were varied in a range corresponding to the usually measured in-situ horizontal pressures(longitudinal or transverse) developed within paste-filled stopes(uniaxial compressive strength, s c 150 k Pa). Results show that the mobilized shear strength is higher at the CPB-CPB interface than that at the CPB-rock interface. Also, the perfect elastoplastic behaviors observed for the CPB-rock interfaces were not observed for the CPB-CPB interfaces with low cement content which exhibits a strain-hardening behavior. These results are useful to estimate or validate numerical model for pressures determination in cemented backfill stope at short term. The tests were performed on real backfill and granite. The results may help understanding the mechanical behavior of the cemented paste backfill in general and, in particular, analyzing the shear strength at backfillebackfill and backfill-rock interfaces. 展开更多
关键词 cemented paste backfillcpb Shear tests backfill-rock wall interface Shear strength Adhesion Apparent cohesion Interface friction angle
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