摘要
充填体是多相复合水泥基材料,被广泛应用于矿山采空区充填。为研究充填体在覆岩作用下的破坏规律,利用单轴压缩声发射试验研究不同灰砂配比的组合充填体受压条件下的声发射特性和材料裂隙演化。结果表明:尾砂占比对组合充填体的声发射特性存在显著影响,在破坏过程中组合充填体的声发射活动由冷缝及软弱面主导,并在试样79%~88%应力峰值时,声发射参数具有显著下降趋势;组合充填体在应力峰值前,声发射能量波动剧烈,b值平稳上升;应力峰值过后,声发射能量降低,b值迅速上升且剧烈地上下波动。利用声发射参数的变化规律可为充填体的破坏进行预测。
As a multi-phase composite cement-based material, filling body is widely used in goaf filling. Therefore, the acoustic emission characteristics and material fracture evolution of the combined backfill with different cement-tailing ratios under compression were investigated via uniaxial compression acoustic emission(AE) tests to clarify the failure law of the backfill under the action of overburden. The results show that the proportion of tailings has an effect on the acoustic emission characteristics of the composite backfill. During the failure process, the acoustic emission characteristics of the composite backfill are dominated by cold joints and weak surfaces, and the stress is 79%-88% in the specimen. At the peak stress, the acoustic emission parameters show a downward trend. Before the stress peak, the AE energy fluctuates violently, and the b value increases steadily. After the stress peak,the AE energy decreases, and the b value increases rapidly and fluctuates violently. The evolution of acoustic emission parameters can be used to predict the damage of the backfill.
作者
赵康
何志伟
宁富金
周昀
严雅静
王彦龙
王军强
ZHAO Kang;HE Zhiwei;NING Fujin;ZHOU Yun;YAN Yajing;WANG Yanlong;WANG Junqiang(School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Solids Waste and Chemicals Management Center,Ministry of Ecology and Environment,Beijing 100029,China;Lingbao Jinyuan Mining Company Limited,Lingbao 472500,Henan,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第11期2462-2469,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目(51764013)
江西省主要学科学术和技术带头人培养计划领军人才项目(20204BCJ22005)
江西省自然科学青年重点基金项目(20192ACBL21014)
中国博士后科学基金资助项目(2019M652277)。
关键词
水泥基材料
裂隙演化
胶结材料组合体
声发射
cement-based material
cracks evolution
cementing material combination
acoustic emission
