爆破振动作用下断层破碎带抗剪强度的劣化规律试验研究  

Experimental study on shear strength deterioration rules of fault fracture zone subjected to blasting vibration

作　　者：吴廷尧 周传波[1] 蒋楠 WU Tingyao;ZHOU Chuanbo;JIANG Nan(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院

出　　处：《中南大学学报（自然科学版）》2019年第6期1457-1465,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41372312);湖北省自然科学基金资助项目(2017CFB310)~~

摘　　要：结合大冶铁矿露天转地下开采边坡工程背景,基于相似理论和振动台模型试验,对爆破振动作用下高陡边坡断层破碎带抗剪强度变化规律进行研究。研究结果表明:1)爆破振动加载强度在小于5.0m/s^2时,断层破碎带峰值抗剪强度随加载时间的增加呈现出累积渐进破坏的变化规律,爆破振动加载强度在7.0m/s^2时,断层破碎带峰值抗剪强度随加时间的增加呈现出惯性失稳破坏的变化规律;2)断层破碎带黏聚力和内摩擦角随加载时间的增加呈现出二次函数的衰减关系,且其累积渐进破坏过程表现出渐变弱化、加速弱化和塑性区贯通破坏3个阶段的变化规律;3)断层破碎带黏聚力和内摩擦角随加载强度的增加呈现线性函数的衰减关系;4)断层破碎带黏聚力和内摩擦角弱化幅度随加载强度的增加而增大,随加载时间的增加呈现先增大后减小的趋势,且黏聚力对于加载时间的敏感程度较内摩擦角的大。Based on open pit to underground mining slope engineering practice of Daye Iron Mine ,similarity theory and shaking table model test were used to study the shear strength deterioration rules of fault fracture zone of high-steep slope under the blasting vibration effect.The results show that:1) when the blasting vibration loading strength is less than 5.0 m/s^2,the peak shear strength of the fault fracture zone shows a cumulative gradual failure with increasing loading time.When the blasting vibration loading strength is 7.0 m/s^2,the peak shear strength of the fault fracture zone shows the change law of inertial instability failure with increasing time;2) with the increase of blasting vibration loading time,the shear strength parameters shows the attenuation of quadratic function.And the process of cumulative progressive failure shows three stages of change,includeing slowly weakening,accelerated weakening and the transfixion of the plastic zone;3) with the increase of blasting vibration loading strength,the cohesion and internal friction angle gradually decreases,and their relationship meets the linear way;4) the weakening percentage of the cohesion and internal friction angle gradually increase with the increase of blasting vibration loading strength.And the weakness percentages of the cohesion and internal friction angle gradually increase at first and then decrease with the increase of blasting vibration loading time.The cohesion force is more sensitive to the blasting vibration loading time than the internal friction angle.

关 键 词：断层破碎带 爆破振动 抗剪强度 劣化规律 

分 类 号：TU411.7[建筑科学—岩土工程]