论文部分内容阅读
为探寻岩石破裂失稳过程中红外温度场的突变异常,在提出“红外温变场(ITVF)”概念的基础上,以高温水浸透粉砂岩加载过程的红外监测试验为例证,对岩石破裂失稳过程中红外温度场的瞬时变化特征进行深入探究,结果表明:(1)饱水粉砂岩破裂失稳过程中ITVF的特征参数(极差R、峰度K、突变比率MR)存在陡增的突变异常;(2)3指标异常主要集中于峰后破裂阶段,趋于在压力降显现时刻伴随出现,出现频率在88.8%以上;(3)异常原因在于当变形进入塑性–峰后破裂阶段,试件表面破裂加剧发育引起红外温度场突变,一方面使得红外温变速率大幅度向极大或极小值方向迁移,导致R值出现突增异常;另一方面使得ITVF异常值的数量突然增加,引起K,MR发生陡增异常;(4)在延性岩石破裂过程中ITF突变的异常现象具有一定的普遍性。该研究为探寻岩石灾变的红外异常前兆提供了新思路和新方法,对岩石灾变的红外预警技术的推广应用具有理论指导意义。
In order to explore the abnormal abnormity of infrared temperature field in the process of rock rupture instability, based on the concept of “ITVF”, taking the infrared monitoring test of high temperature water infiltration through siltstone as an example, The results show that: (1) The characteristic parameters of ITVF (range difference R, kurtosis K, mutation ratio MR) in the process of rupture and failure of saturated siltstone increase steeply (2) The abnormality of 3 indexes mainly concentrated in the period of post-peak rupture and tends to appear along with the appearance of pressure drop, and the frequency of occurrence is above 88.8%. (3) The reason of the abnormality lies in that when the deformation enters the plastic- , The specimen surface rupture intensified development caused by sudden changes in the infrared temperature field, on the one hand makes the rate of infrared temperature change significantly to the maximum or minimum direction of migration, resulting in sudden abnormal increase in R value; the other hand makes the number of ITVF outliers suddenly Increase, causing a sharp increase in K and MR. (4) The anomaly of ITF mutation in the process of ductile rock rupture has a certain degree of universality. The research provides new ideas and new methods for exploring the anomalous infrared anomaly of rock catastrophe, and has theoretical significance for the popularization and application of infrared pre-warning technology for rock catastrophe.