工程科学学报2018，Vol.40Issue(3)：269-275,7.DOI:10.13374/j.issn2095-9389.2018.03.002
岩爆结构面强度的弱化特征
Strength weakening characteristic of rock burst structural planes
摘要
Abstract
Prediction and prevention of rock burst in project is difficult because of its paroxysm and sudden destructiveness. Deter-mining how to predict the time, place, and intensity of rock burst is one of the main engineering problems that must be solved via geotechnical engineering. Increasing number of experts from the field of underground mining and construction are applying new monitoring techniques and methods to study rock burst for its effective prediction. In the model experiment, the entire process of structure-type rock burst was remotely monitored via the laser Doppler vibrometer. Based on the dynamic theory and energy conservation law;the natural vibration frequency was used to analyze the elastic coefficient of the shear plane. The experimental results show that the incompatible weakness of structural plane is a necessary condition for the occurrence of rock burst, and the spatiotemporal difference of the structural plane strength is the main factor that determines the immediate or the time-delayed rock burst. Slow weakening of the structure causes time-delayed rock burst, whereas rapid weakening causes immediate rock burst. During the whole process of rock burst, the weakening rate of rock mass structure is determined using the natural vibration frequency, and the dissipated energy of the structure occupies merely 0. 06% of the rock elastic energy. Thus, most of the elastic energy is released in the form of kinetic energy, and the rock is ejected with high velocity. Furthermore, the incompatible weakening characteristics of rock burst structural planes can be analyzed using the analysis of the frequency decline rate. Therefore, the new monitoring index of dynamic characteristics such as natural vibration frequency improves the understanding of evolution characteristics of rock burst and plays a significant role in the early warning of rock burst in underground engineering.关键词
岩爆/结构面/固有振动频率/非协调性弱化特征/损伤Key words
rock burst/structural planes/natural vibration frequency/incompatible weakening characteristics/damage分类
建筑与水利引用本文复制引用
杜岩,郑孝婷,谢谟文,蒋宇静,刘秋强..岩爆结构面强度的弱化特征[J].工程科学学报,2018,40(3):269-275,7.基金项目
国家自然科学基金资助项目(41572274,41372370,41702371) （41572274,41372370,41702371）
中国博士后科学基金资助项目(2016M591078) （2016M591078）
浙江省山体地质灾害防治协同创新中心开放基金资助项目(PCMGH-2016-Y-02) （PCMGH-2016-Y-02）
