冰岩耦合体爆炸应力波传播特性分析  

Propagation Characteristics of Explosion Stress Wave in Ice-filled Rock Mass

作　　者：李萍丰 王婷婷[2] 唐春安[3] 张兵兵 LI Ping-feng;WANG Ting-ting;TANG Chun-an;ZHANG Bing-bing(Hongda Blasting Engineering Group Co.,Ltd.,Guangzhou 510623,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]宏大爆破工程集团有限责任公司,广州510623 [2]东北大学资源与土木工程学院,沈阳110819 [3]大连理工大学海岸和近海工程国家重点实验室,大连116024

出　　处：《爆破》2022年第4期44-52,共9页Blasting

基　　金：国家自然科学基金资助项目(No.42050201);冻土工程国家重点实验室开放基金课题(No.SKLFSE202013)。

摘　　要：寒区矿产资源露天爆破开采设计及其致灾防治已成为我国西部能源安全开采领域的关键性问题。为研究高寒地区露天矿山爆破开采工程中应力波在饱冰裂隙岩体中传播机制,先给出冰岩耦合体的一般定义,界定冰岩耦合体基本特征及其与冻结土体的差异性;其次,采用RFPA^(2D)-Dynamic数值试验方法揭示了爆炸应力波在冰岩耦合体中传播过程,实现波峰运移可视化,发现并分析了应力波在裂隙冰与基岩交界处透、反射现象;进一步,讨论了裂隙冰数量、间距、厚度对应力波在冰岩耦合体中传播规律的影响,研究结果表明:爆炸应力波在完整基岩中传播效果最好,在冰岩耦合体传播效果次之,在含空气裂隙岩体中传播效果最差;与完整基岩相比,裂隙冰的存在削减应力波幅度,应力波在岩棒模型中衰减程度从6.1%变成7.1%;应力波在冰岩耦合体中传播效果受裂隙冰厚度、数量影响较为明显;而间距对其影响较小,透射系数维持在0.925;透射应力波幅值随裂隙冰厚度、数量增加而逐步降低;应力波衰减程度随裂隙冰厚度变化满足:y=0.6527+0.03687x,随裂隙冰数量变化满足:y=0.0715+0.0026x。研究结果为高寒地区露天矿山开采爆破参数设计以及灾害的预防提供理论研究基础。The design and disaster prevention of open-pit mining of mineral resources by bench blasting in cold regions have become key issues in the safe extraction of energy in Western China.In order to study the propagation mechanism of stress waves in the blasting process of a surface mine in plateau cold regions,the definition of ice-filled rock mass is given first,and the basic characteristics of ice-filled rock mass and its difference with frozen soil are defined.Secondly,the propagation process of stress waves in ice-filled rock mass is reproduced by RFPA^(2D)-dynamic and wave peak migration visualization is achieved.At the same time,the reflection and transmission of stress waves at the interface between the cracked ice and the bedrock are analyzed.Furthermore,the influence of the quantity,spacing,and thickness of the cracked ice on the propagation process of stress waves is discussed.The numerical simulation results show that the propagation effect of the explosion stress waves is the best in intact bedrock,second in ice-filled rock mass,and the worst in air-filled cracked rock mass.Compared with the intact bedrock,the cracked ice existing in cracks reduces the stress wave amplitudes,and the attenuation of the stress waves in the rock rod model changes from 6.1%to 7.1%.The propagation of stress waves in the ice-filled rock mass is affected by the thickness and quantity of the cracked ice more than the,with a transmission coefficient of 0.925.When,the thickness and quantity of the cracked ice increases,the amplitude of the transmitted stress waves decreases.Take the attenuation degree of stress wave as y,it follows y=0.6527+0.03687x with the thickness of the cracked ice,and y=0.0715+0.0026x with the quantity of the cracked ice.The research results provide a theoretical research basis for blasting parameter design and disaster prevention of surface mine in plateau cold region.

关 键 词：高原寒区 冰岩耦合体 爆炸应力波 波传播 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]