地下工程岩体岩爆倾向性微观机制研究

Study on micro-mechanism of rockburst tendency of rock mass in underground engineering

为提高地下岩爆灾害预测的准确性,考虑岩石的岩性,选取大理岩、花岗岩、角岩和矽卡岩进行力学和微观试验,研究具有岩爆倾向性岩石的微观机制,建立基于莫氏硬度的岩爆倾向性串并联模型。计算4种岩石的加权模式硬度。结果显示,串联加权莫氏硬度大于6.0、并联加权莫氏硬度大于0.5的岩石表现出强烈的岩爆倾向性,串联加权莫氏硬度小于4.0、并联加权莫氏硬度小于0.3的岩石表现出较弱的岩爆倾向性。试验结果表明,岩石的岩爆倾向性主要与岩石的微观结构、矿物组成和解理条件等有关,含坚硬、储能能力强的矿物的岩石有强烈岩爆倾向性。

At present,there are more and more underground engineering projects facing more serious threat of rockburst. This thesis focuses on the study of micro-mechanism of rockburst based on the rock lithology. Four kinds of rock were chosen to and the data on the rockburs proneness mechanical tests and micro-structure tests. Based on both the data on the mineral composition and the data on the rockburs proneness of the samples,a quantitative criterion was established for the rockburst proneness.Two models were built respectively for series connection and parallel connection Mohs hardness-weighted to calculate the rockburst proneness. When the series connection Mohs hardness-weighted is bigger than 6.0 or the parallel connection Mohs hardness-weighted is bigger than 0. 5,the rock shows strong rockburst proneness.When the series connection Mohs hardness-weighted is smaller than 4. 0 or the parallel connection Mohs hardness-weighted of is smaller than 0.3,the rock shows weak rockburst proneness. The results show that the rock with hard and strong energy storage ability mineral shows strong rockburst proneness.