基于FLAC~(3D)的岩质边坡爆破动力响应规律研究
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摘要
边坡的动力稳定一直以来都是岩土工程及地震工程重点研究的问题。利用FLAC~(3D)数值计算方法,对爆破作用下岩质边坡振动速度、位移、应力等进行模拟,并在与实测爆破振动峰值进行对比验证的基础上,分析边坡的动力响应规律。结果表明:地震波具有极强的方向性,主要朝施加荷载的正向传播;在边坡坡面和坡脚处因应力波在边坡自由面反射容易产生一定区域的振动加强场;应力的响应特征上,无论是拉应力还是压应力其最大值均出现在坡脚附近,在实际的边坡爆破开挖过程中,对边坡的坡面尤其是坡脚处应该加强保护措施。研究成果对岩质边坡开挖设计及施工具有一定的参考价值。
The dynamic stability of slope has always been the focus of geotechnical engineering and seismic engineering. In this paper, FLAC~(3 D) numerical calculation method is used to simulate the vibration velocity, displacement and stress of rocky slope under blasting action. And on the basis of comparing and verifying the peak value of blasting vibration, the dynamic response laws of rocky slope was analyzed. The results show that the seismic wave has a strong directionality and propagates mainly to the positive direction of the applied load. On the slope surface and at the foot of the slope, it is easy to produce the vibration strengthening field in a certain area due to the reflection of the force wave on the free surface of the slope. The maximum value of stress, whether tensile stress or compressive stress, appears near the slope foot. In the actual blasting excavation, the slope surface should be protected, especially the slope foot. The research results have certain reference for the construction design of rocky slope excavation.
The dynamic stability of slope has always been the focus of geotechnical engineering and seismic engineering. In this paper, FLAC~(3 D) numerical calculation method is used to simulate the vibration velocity, displacement and stress of rocky slope under blasting action. And on the basis of comparing and verifying the peak value of blasting vibration, the dynamic response laws of rocky slope was analyzed. The results show that the seismic wave has a strong directionality and propagates mainly to the positive direction of the applied load. On the slope surface and at the foot of the slope, it is easy to produce the vibration strengthening field in a certain area due to the reflection of the force wave on the free surface of the slope. The maximum value of stress, whether tensile stress or compressive stress, appears near the slope foot. In the actual blasting excavation, the slope surface should be protected, especially the slope foot. The research results have certain reference for the construction design of rocky slope excavation.
引文
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[13] 孟祥甜.露天边坡动载响应特性的数值模拟研究[D].包头:内蒙古科技大学,2015.
[14] 宋光明,陈寿如,史秀志,等.露天矿边坡爆破振动监测与评价方法的研究[J].有色金属,2000(4):24-27.
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[19] S.G.Chen,J.Zhao. UDEC modeling of a field explosion test[J].Internationgal Journal of Blasting and Fragmentation,2000(4):149-163
[20] Josef Henrych.The Dynamics of Explosion and Its Use[M].New York:Elsevier Scientific Publishing Company,1979.
[2] Spyros Sklavounos,FotisRigas.Computer simulation of shock waves transmission in obstructed Terrains[J].Journal of Loss Prevention in the Process Industries, 2004,(17):407-417.
[3] Siyahi ,Bilge G.Pseudo-static stability analysis innormally consolidated soil slopes subjected to earthquake[J].Teknik Dergi/Technical journal of Turksih chamber of civil enginers,1998,9(DEC):457-461.
[4] UDEC(Universal Distinct Element Code)user′s manual Version 3.0[M].Lundon:Itasca Consulting Group,Inc.,1996.
[5] 蒋楠,周传波,平雯,等.岩质边坡爆破振动高速度高程效应[J].中南大学学报:自然科学版,2014,45(1):237-243.
[6] 唐海,李海波,蒋鹏灿,等.地形地貌对爆破振动波传播的影响实验研究[J].岩石学与工程学报,2007(9):1817-1823.
[7] 唐海,李海波.地形地貌对爆破振动波传播的影响实验研究[J].岩石力学与工程学报,2007(09):1817-1823
[8] 言志信,蔡汉成,王群敏,等.纵波作用下边坡动力响应[J].工程地质学报,2010,18(4):487-505.
[9] 祁生文,伍法权.边坡动力响应规律研究[J].中国科学E辑技术科学,2003,33(s):28-40.
[10] 何铮,徐卫亚,石崇,等.顺层岩质高边坡地震变形破坏机制三维数值反演研究[J].岩土力学,2009,30(11): 3512-3518.
[11] 陈明,卢文波,李鹏,等.岩质边坡爆破振动速度的高程放大效应研究[J].岩石力学与工程学报,2011(11):2189-2195.
[12] 李鹏,苏生瑞,王闫超,等.含软弱层岩质边坡的动力响应研究[J].岩土力学,2013(S1):365-370,378.
[13] 孟祥甜.露天边坡动载响应特性的数值模拟研究[D].包头:内蒙古科技大学,2015.
[14] 宋光明,陈寿如,史秀志,等.露天矿边坡爆破振动监测与评价方法的研究[J].有色金属,2000(4):24-27.
[15] 王在泉,陆文兴.高边坡爆破开挖振动传统规律及质量控制[J].爆破,1994,11(3):1-4.
[16] 夏详,李俊如,李海波,等.爆破荷载作用下岩体振动特征的数值模拟[J].岩土力学,2005,26(1): 50-56.
[17] Kyhlemeyer R L,Lysmer J.Finite Element Method Accuracy for Wave Propagation Problems[J].Soil Mech & Foundations Div,ASCE,1973,99(5):417-421.
[18] Josef Henrych.The Dynamics of Explosion and Its Use[M].New York:Elsevier Scientific Publishing Company,1979.
[19] S.G.Chen,J.Zhao. UDEC modeling of a field explosion test[J].Internationgal Journal of Blasting and Fragmentation,2000(4):149-163
[20] Josef Henrych.The Dynamics of Explosion and Its Use[M].New York:Elsevier Scientific Publishing Company,1979.