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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第5期    总第285期    2018年5月

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文章编号:1672-7207(2018)05-1237-07
节理倾角对类岩石冲击能量传递影响的试验研究
王建国1, 2,梁书锋2,高全臣2,李祥龙3,王立娜1,赵炎1

(1. 云南农业大学 建筑工程学院,云南 昆明,650201; 2. 中国矿业大学(北京) 力学与建筑工程学院,北京,100083; 3. 昆明理工大学 国土资源与工程学院,云南 昆明,650093)

摘 要: 用砂浆材料模拟不同倾角的节理岩石试件,并借助霍普金森压杆试验系统(SHPB)装置对其进行相似速度下的冲击试验,研究节理倾角对应力波穿越节理面时的波动特性和能量传递及耗散的影响,并给出能量耗散比随节理倾角变化的表达式。研究结果表明:在相似入射能量条件下,随着节理角度增大,反射能量比ER/EI(即反射波能量ER与入射波能量EI之比)先增大后减小,透射能量比ET/EI(即透射波能量ET与入射波能量EI之比)先减小后增大,且在节理倾角等于破坏角时,反射能量比和透射能量比到达极值;能量耗散比ED/EI(即节理试件耗散能量ED与入射波能量EI之比)随节理倾角的变化有所波动,分别在倾角为30°和90°时取得2个极大值。

 

关键词: 节理倾角;节理岩石;SHPB;应力波;能量耗散

Experimental study of jointed angles impact on energy transfer characteristics of simulated rock material
WANG Jianguo1, 2, LIANG Shufeng2, GAO Quanchen2, LI Xianglong3, WANG Lina1, ZHAO Yan1

1. College of Civil and Architectural Engineering, Yunnan Agricultural University, Kunming 650201, China; 2. School of Mechanics & Civil Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China; 3. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China

Abstract:Impact experiments at similar velocity were carried out on different angle jointed rock specimens which were simulated with mortar by split Hopkinson pressure bar(SHPB) device. The influential effects of jointed angles on wave propagation, energy transmission and dissipation were studied when the stress waves went through the jointed plane. An empirical model for energy dissipation ratio to the jointed angles was formulated. The results show that under the condition of similar incident energy, when the jointed angle increases, the reflection energy ratio increases at first, and then decreases, and the transmission energy ratio decreases at first, and then increases. In addition, when the jointed angle is equal to the damage angle, both of reflection energy ratio and transmission energy ratio reach the extreme value. Energy dissipation ratio fluctuates along with the change of jointed angle, reaching two maximum points respectively at the angles of 30° and 90°.

 

Key words: jointed angle; jointed rock; split Hopkinson pressure bar(SHPB); stress wave; energy dissipation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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