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IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-02-24 DOI:10.1007/s10064-025-04156-8

Wenxin Li, Changdi He, Xiao Wang, Chunguang Wang, Tulio Dias De Almeida, Lianjun Chen, Brijes Mishra

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引用次数: 0

摘要

本实验和数值研究探讨了动态压缩应力波在地质岩性层中的传播。与传统的分体式霍普金森压力棒（SHPB）系统不同，本研究采用了定制设计的电磁摆锤冲击试验（EPIT）系统。开发电磁控制 EPIT 系统是为了能够以不同的速度精确一致地重复冲击测试。EPIT 系统被集成到一个改进的 SHPB 设备中，其特点是长度加长到 3 米，并且只使用岩棒，而不是传统的钢棒。分析了三种改进的 SHPB 配置--单岩棒、双岩棒和三岩棒系统。测试在石灰石、大理石和砂岩试样上进行，每个试样长 1 米，直径 0.05 米。结果表明，砂岩在传播路径上表现出最高的峰值压缩应变和衰减率，有别于在石灰岩和大理岩上观察到的行为。各岩层的动态响应特性受到动荷载源、岩层固有特性和后续岩层特性的影响。平均压缩应变放大比率与密度（\(\rho \)）比率（\( R = -0.92 \)）之间存在明显的负相关。弹性模量（E）、P 波速度（v_p）和波阻抗（Z）的比率也对压缩应变放大率有显著影响（分别为 R = -0.85、-0.86 和 -0.85）。UCS 比率对应变放大的影响最小（（R = -0.7））。此外，使用幂函数和高斯函数的组合可以有效地描述应力衰减的模式。

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Experimental and numerical study of dynamic compressive stress wave propagation across geological lithological layers

This experimental and numerical study examines the propagation of dynamic compressive stress waves within geological lithological layers. In contrast to conventional split Hopkinson pressure bar (SHPB) systems, this research employed a custom-designed electromagnetic pendulum impact testing (EPIT) system. The electromagnetically controlled EPIT system was developed to allow precise and consistent repetition of impact tests at varied speeds. The EPIT system was integrated into a modified SHPB apparatus, featuring an extended length of up to 3 m and using rock bars exclusively, rather than conventional steel bars. Three types of modified SHPB configurations-single-rock-bar, double-rock-bar, and triple-rock-bar systems-were analyzed. Testing was conducted on limestone, marble, and sandstone specimens, each measuring 1 m in length and 0.05 m in diameter. Results indicate that sandstone exhibits the highest peak compressive strain and attenuation rate along the propagation path, distinguishing it from the behaviors observed in limestone and marble. The dynamic response characteristics of each rock layer are affected by the source of dynamic load, the inherent properties of the rock layer, and the properties of subsequent layers. A significant negative correlation was found between the average compressive strain amplification ratio and density (\(\rho \)) ratio (\( R = -0.92 \)). Ratios of elastic modulus (\( E \)), P-wave velocity (\(v_p\)), and wave impedance (\(Z_w\)) also notably influence compressive strain amplification (\( R = -0.85, -0.86, \) and \( -0.85 \), respectively). The UCS ratio has the least impact on strain amplification (\( R = -0.7 \)). Additionally, the pattern of stress attenuation was effectively described using a combination of power and Gaussian functions.

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.