不同加载速率下露天端帮胶结充填体的变形破坏试验研究
Experimental study on deformation and failure of cemented filling body in open-pit end slope under different loading rates
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摘要: 为了揭示加载速率对废石胶结充填体变形破坏特征的影响，开展了5组加载速率下废石胶结充填体的单轴压缩试验，分析其力学特性、破坏模式和能量耗散的变化。结果表明：废石胶结充填体的峰值强度和弹性模量与加载速率分别呈正线性相关和二次函数增长关系；随着加载速率的增大，充填体试样的破坏模式由张拉劈裂破坏转向剪切破坏，且加载速率越大，破坏程度也越大；结合能量演化特征，废石胶结充填体均经历压密、线弹性、裂纹稳定扩展、裂纹加速扩展和峰后应变软化衰减5个阶段；随着加载速率的增大，废石胶结充填体总应变能和弹性应变能的涨幅越来越大，耗散能的涨幅变小，弹性应变能占比增大，峰前塑性减弱。Abstract: In order to reveal the influence of loading rate on the deformation and failure of cemented waste rock filling body, uniaxial compression tests of cemented waste rock filling body under five groups of loading rates were carried out, and the changes of mechanical properties, failure mode and energy dissipation were analyzed. The results show that the peak strength and elastic modulus of cemented waste rock filling body have positive linear correlation and quadratic function growth with loading rate, respectively; with the increase of loading rate, the failure mode of filling body changes from tensile splitting failure to shear failure, and the greater the loading rate is, the greater the degree of damage is; combined with the energy evolution characteristics, the cemented waste rock filling body experiences five stages: compaction, linear elasticity, stable crack growth, accelerated crack growth and post-peak strain softening attenuation; with the increase of loading rate, the increase of total strain energy and elastic strain energy of cemented waste rock filling body is more and more, the increase of dissipation energy decreases, the proportion of elastic strain energy increases, and the pre-peak plasticity decreases.
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