低应变率冲击荷载下节理花岗岩的动力响应规律

doi:10.16285/j.rsm.2023.1225

岩土力学 ›› 2024, Vol. 45 ›› Issue (6): 1755-1762.doi: 10.16285/j.rsm.2023.1225

低应变率冲击荷载下节理花岗岩的动力响应规律

王智德¹，司莹莹¹，李杰^{1, 2}，钱梦凡¹，安佳兴¹

1. 武汉理工大学土木工程与建筑学院，湖北武汉 430070；2. 武汉市勘察设计有限公司，湖北武汉 430000

收稿日期:2023-08-15 接受日期:2023-12-15 出版日期:2024-06-19 发布日期:2024-06-20
作者简介:王智德，男，1983年生，博士，高级实验师，硕士生导师，主要从事岩石爆破冲击方面的研究。E-mail: wangzhide-wuhan@whut.edu.cn
基金资助:
国家自然科学基金（No.42077228，No.51374163）；磷资源开发利用教育部工程研究中心开放基金（LKF202004）；武汉市城乡建设委员会科技计划项目（武城建[2017]12号-201740，武城建[2019]68号-201941）。

Dynamic response of jointed granite under low strain rate impact load

WANG Zhi-de¹, SI Ying-ying¹, LI Jie^{1, 2}, QIAN Meng-fan¹, AN Jia-xing¹

1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China; 2. Wuhan Geotechnical Engineering and Surveying Co., Ltd., Wuhan, Hubei 430000, China

Received:2023-08-15 Accepted:2023-12-15 Online:2024-06-19 Published:2024-06-20
Supported by:
This work was supported by the National Natural Science Foundation of China (42077228, 51374163), the Open Project of Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education (LKF202004) and the Science and Technology Program of Wuhan Municipal Urban-Rural Development Bureau ([2017] No. 12-201740, [2019] No. 68-201941).

摘要/Abstract

摘要： 岩体中节理面的存在是引起冲击应力波衰减的主要原因，会造成爆炸能量的衰减及降低爆破效果。为探讨低应变率下不同节理倾角花岗岩在冲击荷载作用下的动态力学性质、应力波传递规律和能量传递规律，利用分离式霍普金森压杆（split Hopkinson pressure bar，简称SHPB）试验装置对低应变率下3种不同冲击气压、4种不同倾角的节理花岗岩进行冲击试验。结果表明：（1）在含节理的岩样中，其峰值应力随节理倾角的增大呈下降趋势，随冲击荷载的增大呈上升趋势；（2）透射系数随节理倾角的增加先增大后减小，随冲击荷载的增大先减小后增大；（3）能量传递系数随节理倾角的增加先增高后降低，完整岩样、节理倾角θ= 0º和45º的岩样，其能量传递系数都随着冲击荷载的增大而减小，而节理倾角θ = 15º和30º的岩样，其能量传递系数随着冲击荷载的增大先减小后增大。

关键词: 倾角, 节理花岗岩, SHPB冲击试验, 动力响应, 低应变率

Abstract:

The presence of joint surfaces in rock masses primarily causes the attenuation of shock stress waves, leading to reduced explosion energy and blasting effectiveness. To investigate the dynamic mechanical properties, stress wave transfer law, and energy transfer law of granite with different joint dip angles under low strain rate impact loads, impact tests were conducted on jointed granite using the split Hopkinson pressure bar (SHPB) device. The tests involved three different impact pressures and four different dip angles. The results indicate that: (1) In rock samples with joints, the peak stress decreases with the increase of joint dip angle and increases with the increase of impact load. (2) The transmission coefficient initially increases and then decreases with increasing joint dip angles, and initially decreases and then increases with increasing impact load. (3) The energy transfer coefficient initially increases and then decreases with the increase of joint dip angle. For intact rock samples and rock samples with joint dip angles of θ = 0º and 45º, the energy transfer coefficient decreases with the increase of impact load. For rock samples with joint dip angles of θ = 15º and 30º, the energy transfer coefficient of first decreases and then increases with the increase of impact load.

Key words: dip angles, jointed granite, SHPB impact test, dynamic response, low strain rate

中图分类号: TU456

王智德, 司莹莹, 李杰, 钱梦凡, 安佳兴, . 低应变率冲击荷载下节理花岗岩的动力响应规律[J]. 岩土力学, 2024, 45(6): 1755-1762.

WANG Zhi-de, SI Ying-ying, LI Jie, QIAN Meng-fan, AN Jia-xing, . Dynamic response of jointed granite under low strain rate impact load[J]. Rock and Soil Mechanics, 2024, 45(6): 1755-1762.

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低应变率冲击荷载下节理花岗岩的动力响应规律

Dynamic response of jointed granite under low strain rate impact load

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