节理走向角度对爆炸应力波传播影响的试验研究  

Experimental Study of Influence of Joint Angle of Strike on Explosive Stress Wave Propagation

作　　者：刘际飞[1] 璩世杰[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《爆破》2014年第2期57-61,66,共6页Blasting

基　　金：国家自然科学基金资助项目(51274020)

摘　　要：自然岩体多为含有节理裂隙等地质结构面的不连续介质。大量的经验表明,岩体的这种不连续性对爆破工程中爆炸应力波的传播及岩石的破坏范围与程度都具有重要影响。为了研究节理走向角度对爆炸应力波传播的影响,分别对含不同走向角度节理岩体的声波速度与爆炸应力波通过节理时振幅的衰减进行了试验研究。首先对含不同走向角度的层状节理岩石试件进行了声波波速测试,结果表明含节理岩石试件的声波速度与完整试件相比都有不同程度的衰减,且衰减程度随节理与声波传播方向夹角的增大呈线性减小关系。其次,通过对司家营铁矿现场24次台阶爆破试验,发现应力波通过节理时,振幅的衰减程度随节理走向角角度的增大呈先减小后增大变化,当走向角度为90°时,应力波振幅的衰减最小。The natural rocks were in-continuous mass composed of geological features such as joints and fissures. A large number of experiences show that this discontinuity of rocks made a great effect on the explosive stress wave propagation, scope and extent of the rock destruction. In order to study the influence of joint angles on the explosive stress wave propagation, the experimental studies on the rock acoustic wave velocity in various joint angles and amplitude damping factor of the explosive stress wave through joints were put forward. Firstly the acoustic wave velocity of the jointed rock specimen with various stratiform of joint angles was tested, the result showing that both the acoustic wave velocity of the jointed rock specimen and the complete specimen had different attenuation degrees with a relation of linearity reduction with the increase of the joint angle and acoustic wave velocity propagation direction. Secondly ,24 sidestep bursting tests were conducted on spot in iron ore. The result showed that the amplitude damping factor reduced firstly and increased afterward with the increase of joint angle when going through joints, and the amplitude damping factor of the stress wave was smallest when the angle strike reached 90 .

关 键 词：应力波 节理岩体 节理走向角度 振幅衰减 岩体声波试验 

分 类 号：TU459.3[建筑科学—岩土工程]