层状岩体是地下工程建设常见的地质构造，钻爆法施工在层状岩体中表现为爆破成型效果差、超欠挖现象严重、振动传播不均衡等问题。抵抗线是影响爆破效果的关键参数，本研究以最小抵抗线为控制指标，研究初始应力与节理角度等影响下的层状岩体爆破破岩规律。以Ⅲ级围岩为地质背景，采用分层浇筑的方法制备不同节理参数的混凝土试块作为层状岩体的模拟材料，进行了一系列不同爆破条件下的爆破试验，结合高速摄影机、动态信号分析系统以及智能五段爆速仪等设备监测了试验过程；利用LS-DYNA三维数值仿真模型，分析了地应力静载与爆炸动载耦合作用下层状岩体的损伤及应力波传规律。研究结果表明：节理对爆破应力波地传播有阻隔作用，改变了裂纹扩展的方向和形态，应力波传至节理面后大量能量发生反射现象，少量能量发生透射现象穿过节理面，爆破效果上表现为主裂纹首先沿节理弱面贯穿，垂直于节理方向迎爆侧的岩石裂纹发育优于背侧裂纹，迎爆侧岩石内的应变强度大于背爆侧；随着抵抗线在6～10 cm增大，层状岩体爆破产生的爆破粉碎区及裂隙区范围逐渐减小，但爆破空腔范围先增大后减小，抵抗线较小时爆炸能量主要以气体形式逸出造成能量浪费，较大时爆炸能量作用于岩石内部难以抛掷岩石，当抵抗线为H=8 cm时，爆破产生的破岩效果最好；节理面迎爆侧有效应力随最小抵抗线的增加呈现先增大后减小趋势，合速度呈现先减小后增大趋势，节理面背爆侧有效应力峰值和合速度峰值变化趋势平缓。研究成果有助于加深对地下工程中层状岩石爆破破岩机理的认识。

Layered rock is a common geological structure of underground engineering construction, drilling and blasting method construction in layered rock is manifested in poor blasting and shaping effect, serious phenomenon of over and under excavation, uneven vibration propagation and other problems. Resistance line is a key parameter affecting the effect of blasting, this study takes the minimum resistance line as a control index to study the blasting and rock breaking law of layered rock body under the influence of initial stress and joint angle. Taking the Class III surrounding rock as the geological background, the concrete specimens with different nodal parameters were prepared as the simulation material of layered rock body by layered casting method, and a series of blasting experiments under different blasting conditions were carried out, and the test process was monitored by the combination of high-speed camera, dynamic signal analysis system, and intelligent five-segment bursting tachymeter and other equipment; and the damage of layered rock body under the coupling of static geostatic load and dynamic blast load and the law of stress wave propagation were analysed by using the three-dimensional numerical simulation model of LS-DYNA. The results of the study show that: joints on the propagation of blasting stress waves have a barrier effect, changing the direction and shape of crack expansion, stress waves transmitted to the joint surface after a large amount of energy reflection phenomenon, a small amount of energy transmittance phenomenon through the joint surface, The blasting effect shows that the main cracks first penetrate along the weak faces of the joints. Blasting effect shows that the main cracks first along the weak face of the joints through, perpendicular to the direction of the joints on the side of the rock crack development is better than the back side of the cracks, on the side of the explosion of the strain strength of the rock is greater than that of the back side of the explosion; As the resistance line increases from 6 cm to 10 cm, the extent of the blast crushed zone and fissure zone produced by the blasting of the laminated rock body gradually decreases; As the resistance line increases from 6 cm to 10 cm, the range of blasting crushed area and fissure area produced by blasting of layered rock body decreases gradually, but the range of blasting cavity first increases and then decreases. When the resistance line is small, the majority of the explosion energy is dissipated in the form of gas, resulting in energy wastage. However, when the resistance line is larger, the explosive energy acts upon the interior of the rock, making it difficult to project the rock. Blasting produces the best rock breakage when the line of resistance is H = 8 cm; The effective stress on the face of the joints on the side of the explosion with the increase of the minimum line of resistance shows a trend of increasing and then decreasing, and the combined velocity shows a trend of decreasing and then increasing. The peak values of the effective stress and combined velocity on the blasting side of the joint surface change smoothly. The research results contribute to a deeper understanding of the mechanism of layered rock blasting in underground engineering.