爆炸加载下砼的瞬态应变实验研究

RDX药包在砼模型中爆炸，距药包中心80mm处的电阻应变传感器，依次记录到由爆炸冲击能(Es)和膨胀能(Eb)加载，在砼中先后形成的两个不同的径向爆炸应变波。这可能表明，耦合装药爆炸加载作用下，砼经历了两次明显的径向变形；与Eb加载产生的应变情况相比，Es加载产生压应变的持续时间很短，但其峰值明显增大，平均应变率更是增大了约20倍。     

Radial explosion strain and its fracture effect from confined explosion with charge of cyclonite

Instrumented experiments were conducted in concrete models to study the explosion-induced radial strain and fracture effect of rock-like media under confined explosion with a charge of cyclonite. As a charge was exploded,two different radial strain waves were sequentially recorded by a strain gage at a distance of 80 mm from the center of charge. Through the attenuation formula of the maximum compressive strain(εrmax), the distribution of εrmax and its strain rate(ε) between the charge and gage were obtained. The effect of the two waves propagating outwards on the radial fracture of surrounding media was discussed. The results show that the two waves are pertinent to the loading of shock energy (Es) and bubble energy (Eb) against concrete surrounding charge, respectively. The former wave lasts for much shorter time than the latter. The peak values of εrmax and ε of the former are higher than those of the latter, respectively.     

爆炸应力波测试技术的研究

在分析爆炸应力波频谱特征对测试系统频响性能要求的基础上,采用超动态应变测试系统,对小药量柱状药包在混凝土模型中爆炸产生的应力波进行了实测。前者由压缩相和拉伸相组成,与冲击能（Es）有关,是爆轰波直接入射孔壁产生的扰动在介质中传播的结果;后者与膨胀能（Eb）的作用有关。实测结果为人们进一步正确认识爆破破岩机理,提供了新的实验依据。     

冲击破岩时破碎区扩展规律数值模拟

针对动载定侵深破岩条件建立计算模型,应用动力有限元法,对楔形钎刃冲击破岩时破碎区扩展过程进行了研究。模拟结果表明：破碎区是随冲击载荷的增大自刃尖下方沿刃面方向向自由面扩展而形成的,且破碎角２θ≈１１６°。这结果与实验结果基本吻合,证明用数值模拟方法研究冲击破岩问题是可行的。     

一种新型掏槽技术在白云岩巷道掘进中的应用

采用不同的掏槽技术，在白云岩中进行巷道掘进的爆破试验，并对试验结果进行了分析，发现双楔形布孔顺序爆破掏槽技术可提高巷道掘进的炮孔利用率，降低巷道施工成本。