不同倾角层理岩体爆破应力波传播规律
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摘要
以层理岩体地层隧道开挖爆破为研究背景,通过理论解析和数值模拟分析层理倾角变化对爆破应力波的传播影响。研究发现:层理对应力波具有一定的吸收和反射作用,加速了爆破应力波在层理岩体中衰减;层理倾角越大应力波的透射率越小,应力波透过层理的衰减度越大;当应力波由硬介质入射到软介质中时透射率小于1,反之透射率则大于1。当层理倾角大于30°时,应力波的反射率随层理倾角的增大而变大;小于30°时,应力波反射率随层理倾角的增大而减小。此外,运用公式求解得到质点振动速度衰减度随层理倾角变化关系。
Taking the blasting in the tunnel excavation as background. The methods of theoretical analysis and numerical simulation are generally taken for analyze its effects on different angles in bedding rock. The study result showed that bedding has certain absorption and reflection action to the stress waves which accelerates the attenuation of blasting stress waves in stratification rock mass. The greater the inclination angle is,the smaller the transmissivity of the stress waves is. Namely,the attenuation of stress waves is greater. When the stress wave is incident from hard to soft medium,the transmissivity is less than 1,whereas the transmissivity is greater than 1. The stress wave reflectivity increases with the bedding angle when it is more than 30 degrees,the stress wave reflectivity decreases with the increase of bedding inclination,when it is less than 30 degrees. In addition,the relationship between the attenuation degree of the particle vibration velocity and the inclination angle change is obtained by using the formula.
Taking the blasting in the tunnel excavation as background. The methods of theoretical analysis and numerical simulation are generally taken for analyze its effects on different angles in bedding rock. The study result showed that bedding has certain absorption and reflection action to the stress waves which accelerates the attenuation of blasting stress waves in stratification rock mass. The greater the inclination angle is,the smaller the transmissivity of the stress waves is. Namely,the attenuation of stress waves is greater. When the stress wave is incident from hard to soft medium,the transmissivity is less than 1,whereas the transmissivity is greater than 1. The stress wave reflectivity increases with the bedding angle when it is more than 30 degrees,the stress wave reflectivity decreases with the increase of bedding inclination,when it is less than 30 degrees. In addition,the relationship between the attenuation degree of the particle vibration velocity and the inclination angle change is obtained by using the formula.
引文
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8李洪涛,卢文波,舒大强,等.爆破地震波的能量衰减规律研究.岩石力学与工程学报,2010;29(增刊1):3364-3369Li Hongtao,Lu Wenbo,Shu Daqiang,et al.Study of energy attenuation law of blast-induced seismic wave.Chinese Journal of Rock Mechanics&Engineering,2010;29(S1):3364-3369
9陶连金,董洪昌,孟涛,等.节理岩体爆破的颗粒流离散元的模拟研究.爆破,2013;30(4):14-20Tao Lianjin,Dong Hongchang,Meng Tao,et al.Simulation study of blasting of jointed rock mass using PFC.Blasting,2013;30(4):14-20
10柴少波,李建春,李海波.柱面波在节理岩体中的传播特性.岩石力学与工程学报,2014;33(3):523-531Chai Shaobo,Li Jianchun,Li Haibo.Propagation characteristics of cylindrical wave in joint rock mass.Chinese Journal of Rock Mechanics&Engineering,2014;33(3):523-531
11 Wei L W,Zhang B,Lei M M.Research on damping blasting technology of subway station foundation pit.Geotechnical Special Publication,2014;(242):910-917
12 Wang Z L,Konietzky H.Modelling of blast-induced fractures in jointed rock masses.Engineering Fracture Mechanics,2009;76(12):1945-1955
13 Li J,Hao H,Wu C Q.Numerical study of precast segmental column under blast loads.Engineering Structures,2017;134:125-137
2 Schoenberg M,Douma J.Elastic wave propagation in media with parallel fractures and aligned cracks.Geophysical Prospecting,2010;36(6):571-590
3黄超,刘军,尤东旭,等.爆破振动传播规律的实验研究.科学技术与工程,2014;14(22):289-294Huang Chao,Liu Jun,You Dongxu,et al.Experimental study on propagation law of vibration of blasting.Science Technology and Engineering,2014;14(22):289-294
4 Kleinberg R L,Chow E Y,Plona T J,et al.Sensitivity and reliability of two fracture detection techniques for borehole application.Journal of Petroleum Technology,1984;36(4):657-663
5 Hudson J A.Overall properties of a cracked solid.Mathematical Proceedings of the Cambridge Philosophical Society,1980;88(2):371-384
6俞缙,钱七虎,宋博学,等.不同应力波穿过多条非线性变形节理时的透射特性.工程力学,2012;29(4):1-6Yu Jin,Qian Qihu,Song Boxue,et al.Transmission of various stress waves across multi-fracture with nonlinear deformation behavior.Engineering Mechanics,2012;29(4):1-6
7俞缙,宋博学,蔡燕燕,等.非线性波在岩石节理处的透射规律研究.应用基础与工程科学学报,2012;20(6):1088-1098Yu Jin,Song Boxue,Cai Yanyan,et al.Transmission law of nonlinear wave across jointed rock.Journal of Basic Science&Engineering,2012;20(6):1088-1098
8李洪涛,卢文波,舒大强,等.爆破地震波的能量衰减规律研究.岩石力学与工程学报,2010;29(增刊1):3364-3369Li Hongtao,Lu Wenbo,Shu Daqiang,et al.Study of energy attenuation law of blast-induced seismic wave.Chinese Journal of Rock Mechanics&Engineering,2010;29(S1):3364-3369
9陶连金,董洪昌,孟涛,等.节理岩体爆破的颗粒流离散元的模拟研究.爆破,2013;30(4):14-20Tao Lianjin,Dong Hongchang,Meng Tao,et al.Simulation study of blasting of jointed rock mass using PFC.Blasting,2013;30(4):14-20
10柴少波,李建春,李海波.柱面波在节理岩体中的传播特性.岩石力学与工程学报,2014;33(3):523-531Chai Shaobo,Li Jianchun,Li Haibo.Propagation characteristics of cylindrical wave in joint rock mass.Chinese Journal of Rock Mechanics&Engineering,2014;33(3):523-531
11 Wei L W,Zhang B,Lei M M.Research on damping blasting technology of subway station foundation pit.Geotechnical Special Publication,2014;(242):910-917
12 Wang Z L,Konietzky H.Modelling of blast-induced fractures in jointed rock masses.Engineering Fracture Mechanics,2009;76(12):1945-1955
13 Li J,Hao H,Wu C Q.Numerical study of precast segmental column under blast loads.Engineering Structures,2017;134:125-137