High-pressure gas (HPG) blasting is safe and environmentally friendly, and has replaced traditional explosive blasting in some applications. The characteristics of HPG impact load and the propagation law of the stress wave in layered rock mass (LRM) under HPG blasting were investigated experimentally and numerically. Through experimental tests of hole wall pressure, a segmented exponential model of the hole wall pressure under the impact of HPG was developed; it accurately accounted for the time history characteristics of the hole wall load. Experimental tests of stress wave propagation were conducted; the soft rock–hard rock interface was found to have a significant effect on stress wave propagation in the LRM. Based on the experimental results, a specific strain model for 10 MPa HPG impact was fitted for a single-hole LRM. A polynomial exponential model and a specific strain model (20 MPa HPG impact) were found for the double-hole LRM. The stress wave attenuation laws for single-hole and double-hole LRM were characterised well. The propagation characteristics of stress waves in LRM under the impact of HPG were analysed and a numerical model of stress wave propagation was established. The numerical model adopted the Riedel–Hiermater–Thoma (RHT) material model for the test parameters. The proposed segmented exponential models of hole wall pressure were applied to the lower, middle and upper parts of the blasthole. With the feasibility of the numerical model analysed, the stress wave propagation characteristics were studied by numerical simulation of an underground pipe gallery. This study provides theoretical guidance and practical value for improving rock-breaking theory and optimising HPG blasting in LRM.

中文翻译：

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高压气体冲击下层状岩体中应力波的传播

高压气体 (HPG) 爆破安全且环保，在某些应用中已取代传统的炸药爆破。通过试验和数值研究，研究了HPG爆破作用下HPG冲击载荷特性和应力波在层状岩体(LRM)中的传播规律。通过孔壁压力实验测试，建立了HPG作用下孔壁压力的分段指数模型；准确地说明了孔壁荷载的时程特性。进行了应力波传播实验测试；发现软岩-硬岩界面对 LRM 中的应力波传播有显着影响。根据实验结果，为单孔 LRM 安装了 10 MPa HPG 冲击的特定应变模型。为双孔 LRM 找到了多项式指数模型和特定应变模型（20 MPa HPG 冲击）。很好地表征了单孔和双孔LRM的应力波衰减规律。分析了HPG作用下LRM中应力波的传播特性，建立了应力波传播数值模型。数值模型采用 Riedel-Hiermater-Thoma (RHT) 材料模型作为测试参数。将所提出的孔壁压力分段指数模型应用于炮孔的下部、中部和上部。在分析数值模型可行性的基础上，通过地下管廊数值模拟研究了应力波传播特性。