石灰岩微波致裂规律研究  

Study on the Law of Microwave Fracture of Limestone

作　　者：古傲林 马占国 文佳豪[1] 李阳 陈达 Gu Aolin;Ma Zhanguo;Wen Jiahao;Li Yang;Chen Da(School of mechanics and civil engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221008,P.R.China;College of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310058,P.R.China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Xuzhou,Jiangsu,221008,P.R.China;China Construction Infrastructure Co.,Ltd.,Beijing 100029,P.R.China)

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221008 [2]浙江大学航空航天学院,杭州310058 [3]中国矿业大学深部岩土力学与地下工程国家重点试验室,江苏徐州221008 [4]中国建设基础设施有限公司,北京100089

出　　处：《地下空间与工程学报》2024年第4期1191-1209,共19页Chinese Journal of Underground Space and Engineering

基　　金：国家重点研发项目(2019YFE0118500);国家重点研发项目(2019YFC1904304);国家自然科学基金(52104107);国家自然科学基金(51674250);江苏省基础研究计划青年基金(BK20200634)。

摘　　要：为探求微波激励对坚硬石灰岩力学特性与致裂效果的影响,选取徐州地区典型石灰岩进行微波处理和单轴压缩试验,并建立二相岩模型开展数值试验,分析石灰岩的损伤程度随微波激励功率、时间的变化规律。结果表明:微波激励对石灰岩力学性质的改变包括在两成分的交界面由温度应力引起细小裂缝,此外,微波功率恒定时,两成分交界面的温度增长梯度、应力增长梯度均与处理时间呈负相关;压缩破岩的最佳微波激励功率和时间为3.0 kW/m^(3)的微波处理岩石10 min;随着载荷作用点距中轴线的距离增加,各激励功率下的断裂应力曲线不断收缩,不同激励功率的效率趋于一致;3.0 kW/m^(3)作为岩石受微波激励的裂缝增长关键功率节点,对岩样不同区域裂缝增长梯度影响显著。研究结果可为坚硬石灰岩致裂工作提供参考。In order to investigate the influence of miscrowave excitation on the mechanical properties and cracking effect of hard limestone,the typical limestone in Xuzhou area was selected for microwave treatment and uniaxial compression experiment,and a two-phase rock model was established to carry out numerical experiments,and the law of the change of damage degree of limestone with microwave excitation power and time was analyzed.The results show:The changes in mechanical properties of limestone induced by microwave excitation included small cracks caused by temperature stress at the interface between two components.In addition,the temperature gradient and stress gradient at the interface of the two components are negatively correlated with the treatment time when the microwave power is constant.The optimum microwave excitation power and time of rock compression breaking are 3.0 kW/m~3 microwave treatment for 10 min.With the increase of the distance from the central axis of the load point,the fracture stress curve under each excitation power shrinks continuously.As a key power node of microwave-stimulated rock fracture growth,3.0 kW/m~3 has significant influence on fracture growth gradient in different regions of rock samples.The results can provide reference for the cracking of hard limestone.

关 键 词：石灰岩 微波破岩 单轴压缩 微波激励 最佳处理时间 最佳处理功率 

分 类 号：TD872[矿业工程—非金属矿开采]