發(fā)布時間：2018-11-15 18:48

【摘要】：基于聲發(fā)射記錄的能量和能量演化規(guī)律提出了一種新的評價巖石脆性的方法.通過不同加載速率下紅砂巖的單軸壓縮試驗和不同溫度下花崗巖的單軸壓縮試驗對新方法進行了檢驗,結(jié)果表明:紅砂巖脆性隨著加載速率增加而增大;花崗巖脆性隨溫度的升高存在2個閾值溫度,第一閾值溫度為200℃,第二閾值溫度為800℃,與實際脆性程度相符.隨后利用新的脆性評價方法分析了巖性、圍壓、層狀巖石層理傾向及飽水對脆性的影響,數(shù)值顯示:高水填充石、原煤、泥巖、砂巖、頁巖、花崗巖的脆性依次增大,其中花崗巖的脆性指數(shù)是高水填充石的3.15倍;紅巖石脆性隨圍壓增大而減小,圍壓30MPa時其脆性指數(shù)相比單軸壓縮時的脆性指數(shù)降低了21.5%;無論干燥還是飽水,層狀砂巖隨著層理傾角的增加,脆性先是快速增大后緩慢增大,90°砂巖的脆性指數(shù)在干燥和飽水下分別是0°時的1.80和1.34倍,飽水降低了層狀砂巖的脆性.
[Abstract]:Based on the energy and energy evolution of acoustic emission records, a new method for evaluating rock brittleness is proposed. The new method is tested by uniaxial compression test of red sandstone at different loading rates and uniaxial compression test of granite at different temperatures. The results show that the brittleness of red sandstone increases with the increase of loading rate. There are two threshold temperatures for granite brittleness with increasing temperature. The first threshold temperature is 200 鈩，

本文編號：2334134