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三峡库区砂岩局部化及应变软化参数特征研究
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作者 邓成进 王孔伟 +2 位作者 邓华锋 杨姗姗 鲁涛 《水电能源科学》 北大核心 2010年第4期66-68,共3页
基于压缩试验分析砂岩变形局部化特征可知,砂岩变形局部化带在峰前逐渐形成,峰后沿局部化带稳定软化直至滑移剪切破坏。根据摩尔—库仑准则,引用塑性应变研究了砂岩峰后稳定软化时变形局部化带的屈服软化过程,获得了砂岩在不同塑性应变... 基于压缩试验分析砂岩变形局部化特征可知,砂岩变形局部化带在峰前逐渐形成,峰后沿局部化带稳定软化直至滑移剪切破坏。根据摩尔—库仑准则,引用塑性应变研究了砂岩峰后稳定软化时变形局部化带的屈服软化过程,获得了砂岩在不同塑性应变下的应力状态,分析了砂岩参数随塑性应变的软化变化规律,并在FLAC3D中采用峰后参数变化规律模拟岩样局部化特征。结果表明,计算结果与试验数据基本吻合。 展开更多
关键词 砂岩 局部化带 稳定软化 应变软化参数 塑性应变
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碎屑岩水稳料综合利用技术研究
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作者 姚夫森 《绿色科技》 2025年第6期246-252,共7页
隧道弃渣的处置与砂石骨料的匮乏一直以来是公路工程建设过程中的两大难题。弃渣堆存会造成堆存地的生态环境遭到破坏,占用土地资源,且可能成为泥石流物源,引发次生泥石流灾害。针对上述难题,以西南区域成绵苍巴高速公路隧道弃渣为研究... 隧道弃渣的处置与砂石骨料的匮乏一直以来是公路工程建设过程中的两大难题。弃渣堆存会造成堆存地的生态环境遭到破坏,占用土地资源,且可能成为泥石流物源,引发次生泥石流灾害。针对上述难题,以西南区域成绵苍巴高速公路隧道弃渣为研究对象,以隧道弃渣的资源化利用为目标,对隧道弃渣制作路基水稳料的途径及可行性展开系统探究。针对白垩系下统白龙组碎屑岩的基本特征开展了研究,验证了弃渣作为水稳料集料可行性,进行了弃渣水稳料配制及主要性能测试分析,结合工程渣场占地难题进行工业试验与应用,完成理论到实践过程。结果表明:区域内岩石特性使其不适宜加工混凝土骨料;泥岩不宜作水稳料或高填方填料,砂岩有潜力;水稳料强度和弹性模量受材料级配、水泥掺量、龄期影响,级配影响最小;成果经现场试验和应用验证,严格筛选加工的洞渣可用于高速公路路面建设,提供经济环保填料方案。 展开更多
关键词 弃渣水稳料 软化特征与稳定 微观测试 单轴抗压强度 水稳料配合比
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Analysis of progressive failure of pillar and instabilitycriterion based on gradient-dependent plasticity 被引量:8
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作者 王学滨 《Journal of Central South University of Technology》 2004年第4期445-450,共6页
A mechanical model for strain softening pillar is proposed considering the characteristics of progressive shear failure and strain localization. The pillar undergoes elastic, strain softening and slabbing stages. In t... A mechanical model for strain softening pillar is proposed considering the characteristics of progressive shear failure and strain localization. The pillar undergoes elastic, strain softening and slabbing stages. In the elastic stage, vertical compressive stress and deformation at upper end of pillar are uniform, while in the strain softening stage there appears nonuniform due to occurrence of shear bands, leading to the decrease of load-carrying capacity. In addition, the size of failure zone increases in the strain softening stage and reaches its maximum value when slabbing begins. In the latter two stages, the size of elastic core always decreases. In the slabbing stage, the size of failure zone remains a constant and the pillar becomes thinner. Total deformation of the pillar is derived by linearly elastic Hookes law and gradient-dependent plasticity where thickness of localization band is determined according to the characteristic length. Post-peak stiffness is proposed according to analytical solution of averaged compressive stress-average deformation curve. Instability criterion of the pillar and roof strata system is proposed analytically (using) instability condition given by Salamon. It is found that the constitutive parameters of material of pillar, the geometrical size of pillar and the number of shear bands influence the stability of the system; stress gradient controls the starting time of slabbing, however it has no influence on the post-peak stiffness of the pillar. 展开更多
关键词 instability criterion strain softening pillar strain localization shear band progressive failure (slabbing ) rock burst
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Influences of strain softening and seepage on elastic and plastic solutions of circular openings in nonlinear rock masses 被引量:12
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作者 杨小礼 黄阜 《Journal of Central South University》 SCIE EI CAS 2010年第3期621-627,共7页
Considering the influence of strain softening, the solutions of stress, displacement, plastic softening region radius and plastic residual region radius were derived for circular openings in nonlinear rock masses subj... Considering the influence of strain softening, the solutions of stress, displacement, plastic softening region radius and plastic residual region radius were derived for circular openings in nonlinear rock masses subjected to seepage. The radial stress distribution curve, ground reaction curve, and relation curve between plastic softening region radius and supporting force in three different conditions were drawn respectively. From the comparisons among these results for different conditions, it is found that when the supporting force is the same, the displacement of tunnel wall considering both seepage and strain softening is 85.71% greater than that only considering seepage. The increase values of radial displacement at 0.95 m and plastic softening region radius at 6.6 m show that the seepage and strain softening have the most unfavorable effects on circular opening stability in strain softening rock masses. 展开更多
关键词 strain softening SEEPAGE nonlinear yield ground reaction curve rock masses
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Effect of pore pressure on deformation and unstable snap-back for shear band and elastic rock system
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作者 王学滨 《Journal of Central South University of Technology》 EI 2007年第3期418-424,共7页
Fast Lagrangian analysis of continua(FLAC) was used to study the influence of pore pressure on the mechanical behavior of rock specimen in plane strain direct shear, the distribution of yielded elements, the distribut... Fast Lagrangian analysis of continua(FLAC) was used to study the influence of pore pressure on the mechanical behavior of rock specimen in plane strain direct shear, the distribution of yielded elements, the distribution of displacement and velocity across shear band as well as the snap-back (elastic rebound) instability. The effective stress law was used to represent the weakening of rock containing pore fluid under pressure. Numerical results show that rock specimen becomes soft (lower strength and hardening modulus) as pore pressure increases, leading to higher displacement skip across shear band. Higher pore pressure results in larger area of plastic zone, higher concentration of shear strain, more apparent precursor to snap-back (unstable failure) and slower snap-back. For higher pore pressure, the formation of shear band-elastic body system and the snap-back are earlier; the distance of snap-back decreases; the capacity of snap-back decreases, leading to lower elastic strain energy liberated beyond the instability and lower earthquake or rockburst magnitude. In the process of snap-back, the velocity skip across shear band is lower for rock specimen at higher pore pressure, showing the slower velocity of snap-back. 展开更多
关键词 pore pressure shear band snap-back STRAIN-SOFTENING unstable failure stress-strain curve
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