循环冲击下砂岩力学及损伤特性研究
投稿时间:2019-12-25  修订日期:2020-01-09  点此下载全文
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作者单位E-mail
甘德清 华北理工大学 gdqheut@163.com 
田晓曦 华北理工大学 503779002@qq.com 
刘志义 华北理工大学  
高 锋 华北理工大学  
中文摘要:采用分离式Hopkinson压杆试验装置,开展了不同入射幅值下的红砂岩循环冲击试验,揭示了红砂岩在循环荷载下的力学特性,并利用Weibull分布的统计损伤模型分析了红砂岩损伤演化规律。研究结果表明:以90MPa入射应力进行循环冲击试验时,随着循环冲击次数的增加,动态强度先增大后减小,最大应变以及平均应变率则正好相反,第一次冲击有助于提高红砂岩的抗压强度;随着入射幅值的增大,当以100MPa、110MPa、120MPa入射应力冲击时,动态强度、变形模量和循环次数逐渐减小,最大应变和平均应变率逐渐增大,基于Weibull分布的损伤模型可以反映此材料的损伤演化特性,累积损伤随着冲击次数的增加而增大,累积单位体积吸收能与累积损伤规律具有较好的一致性,岩样出现失稳破坏为大块时的累积损伤均在0.8左右,没有明显的变化。研究结果为矿山岩体安全防护及正确评价岩石稳定性提供理论依据。
中文关键词:分离式Hopkinson压杆  循环荷载  Weibull分布  损伤  累积单位体积吸收能
 
Study on dynamics and characteristics of sandstone under circulation
Abstract:The separation behavior of red sandstone under different incident amplitudes was carried out by using a separate Hopkinson pressure bar test device. The mechanical properties of red sandstone under cyclic loading were revealed. The damage evolution law of red sandstone was analyzed by using the statistical damage model of Weibull distribution. . The results show that when the cyclic impact test is carried out with an incident stress of 90 MPa, the dynamic strength first increases and then decreases with the increase of the number of cyclic impacts. The maximum strain and the average strain rate are opposite. The first impact helps to increase the red The compressive strength of sandstone; with the increase of incident amplitude, when the impact stress is 100MPa, 110MPa, 120MPa, the dynamic strength, modulus of deformation and cycle times are gradually reduced, and the maximum strain and average strain rate are gradually increased. The damage model based on Weibull distribution can reflect the damage evolution characteristics of the material. The cumulative damage increases with the increase of the number of impacts. The cumulative unit volume absorption energy and cumulative damage law are better. The consistency of the rock sample is about 0.8, and there is no obvious change. The research results provide a theoretical basis for the mine to correctly evaluate rock stability.
keywords:Separate Hopkinson pressure bar  cyclic loading  damage  Weibull distribution  cumulative unit volume absorption energy
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