Blasting, Volume. 42, Issue 3, 46(2025)

Experimental Study on Dynamic Characteristics of Similar Rock Mass with Filled Joints at Different Dip Angles

WANG Zhi-de1, WU Yang1, YANG Wen-dong1, LIN Man-qing2,3, ZHU Wen-hua1、*, HU Shi-shi4, WEI Wei4, and DI Yue-kang5
Author Affiliations
  • 1School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
  • 2School of Resources & Safety Engineering, Wuhan Institute of Technology, Wuhan 430205, China
  • 3Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Wuhan 430205, China
  • 4China Gezhouba Group Cement Co.. Ltd., Wuhan 430073, China
  • 5The Fourth Branch of China Railway Signal & Communication Construction Group Co., Ltd., Beijing 101400, China
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    The presence of joint fractures significantly influences the dynamic performance of the rock mass. To investigate the effects of joint angles and filling materials on the dynamic response of filling joint samples under impact loading, a series of impact tests were conducted using a split Hopkinson pressure bar (SHPB). Samples with seven different joint angles and three types of filling materials were tested. The relationships between dynamic characteristics, energy dissipation, joint angles, and properties of the filling material were systematically analyzed. The results indicate that: (1) The stress-strain curves of the joint samples of different filling media are significantly different. The stress-strain curves of sediment and lime filling samples show plastic failure characteristics at joint angle α≤45° and brittle failure at joint angle α>45°, while gypsum filled samples primarily display brittle failure, except at joint angle α=45°, where plastic failure occurs due to stress wave propagation effects. (2) The dynamic compressive strength of joint samples with the same filling material initially decreases and then increases with the increasing joint angle α, reaching a minimum value at α=45°. Among the three filling materials, gypsum-filled joints exhibit the highest compressive strengths. (3) Energy dissipation characteristics vary with joint angle. The reflected energy ratio increases initially and then decreases, peaking at α=45°, while the transmitted and absorbed energy ratios decrease initially and then increase, reaching their lowest values at α=45°. These findings provide critical insights into the dynamic behavior of jointed rock masses and have practical implications for engineering applications involving impact or blast loading.

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    WANG Zhi-de, WU Yang, YANG Wen-dong, LIN Man-qing, ZHU Wen-hua, HU Shi-shi, WEI Wei, DI Yue-kang. Experimental Study on Dynamic Characteristics of Similar Rock Mass with Filled Joints at Different Dip Angles[J]. Blasting, 2025, 42(3): 46

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    Paper Information

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    Received: Nov. 19, 2024

    Accepted: Sep. 18, 2025

    Published Online: Sep. 18, 2025

    The Author Email: ZHU Wen-hua (jyzwh@whut.edu.cn)

    DOI:10.3963/j.issn.1001-487x.2025.03.006

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