ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524
Citation:
WANG Guilin, OUYANG Xiaotian, ZHAI Jun, SUN Fan. Ground Response Law of Methane Explosion in Shallow Buried Three-Cabin Pipe Gallery[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 015202. doi: 10.11858/gywlxb.20200616
ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524
Citation:
WANG Guilin, OUYANG Xiaotian, ZHAI Jun, SUN Fan. Ground Response Law of Methane Explosion in Shallow Buried Three-Cabin Pipe Gallery[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 015202. doi: 10.11858/gywlxb.20200616
Explosion venting accidents in underground comprehensive pipe corridors occur from time to time, causing huge losses to ground personnel and property. Based on a pilot project of an underground comprehensive pipe gallery in Chongqing and the material point method, a high-energy combustion model is used to simulate the process of leaking methane gas explosive’s impact on the structure and surrounding rock of the pipe gallery. Through the simulation, the response characteristics of ground pressure and displacement are studied. The results show that: under the effect of explosion, secondary stress waves caused by reflection and refraction of the contact surface will appear in the pipe gallery and surrounding rock. In the transverse direction, the amplitude of the secondary wave increases with the increase of the horizontal distance from the initiation point, while that generated in the longitudinal direction keeps smaller, and the change remains small with the increasing distance. The explosion caused the overall ground subsidence, but the ground bulged near the center of the detonation point. This bulge was composed of a violent bulge formed by the pipe gallery lining broken and gas directly impacting the rock and soil, and a slight bulge formed by the overall vibration of the pipe gallery.
对于大多数透明材料,当压力达到几百吉帕甚至太帕量级时,冲击波后的状态为流体状态(声速等价于体声速),电介质会发生绝缘体金属相变或者处于电离状态,冲击波阵面表现出很高的反射率,速度干涉仪可以直接对冲击波速度进行测量[10]。在满足一维平面冲击加载条件下,通过靶的设计引入侧向稀疏波(声波),稀疏区域压力下降,受影响区域的冲击波速度下降,冲击波面在稀疏区发生弯曲。利用线成像VISAR(Velocity interferometer system for any reflector)测量冲击波阵面速度历史已经成为冲击动力学领域的常用手段,但是线成像VISAR携带的空间分辨能力却长期被忽略[9, 11]。当线成像VISAR的物镜参数f/D较大时,测量面微小的倾斜会使探测光的回光无法进入成像透镜,导致信号丢失,所以当引入侧向稀疏时,冲击波波阵面发生弯曲,弯曲部分在VISAR像面不会有反射信号,因而可以在记录系统中测到平面冲击波和弯曲冲击波的边界随时间的横向位移。该位移数据反映了冲击波后侧向小扰动的传播过程(声速),可与冲击波速度直接关联,进而获得主冲击绝热线上的连续声速变化曲线。更为详细的原理参考文献[9]。
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ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524
ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524