岩石破裂过程中红外温度场瞬时变化异常探究  

Abnormality of transient infrared temperature field(ITF) in the process of rock failure

作　　者：吴贤振[1] 高祥[1] 赵奎[1] 刘建伟 刘祥鑫 

机构地区：[1]江西理工大学江西省矿业工程重点实验室,江西赣州341000 [2]福建马坑矿业股份有限公司,福建龙岩364000 [3]华北理工大学矿业工程学院,河北唐山063000

出　　处：《岩石力学与工程学报》2016年第8期1578-1594,共17页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51364012);江西省教育厅科技计划项目(GJJ12336);江西省研究生创新专项资金项目(YC2014–S352)~~

摘　　要：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 abnormality of infrared temperature field（ITF） in the process of rock cracking and destabilization,the concept of infrared temperature variation field（ITVF） was put forward in the paper,and the transient characteristics of ITF during rock failure was analyzed and discussed based on the experiment on saturated siltstone samples under thermal imaging observation in loading process. A certain abnormal phenomenon of ITVF during rock instability was found. The abnormal jump of ITVF characteristic parameters,including Range（R）,Kurtosis（K）,Mutation Ratio（MR）,etc,exists in the failure process of saturated siltstone. The occurrence probability of anomalies was up to 88.8%,mainly in the plastic and post-peaking phase,especially tending to appear at the moment of marked pressure dropping. When the deformation entered into the plastic and post-peaking phase,ITF jumped due to the intensified development of specimen surface fracture and the infrared temperature variation rate moved to the direction of the maximum or minimum,which resulted in the abnormal jump of R and the sudden increase in the number of ITVF abnormal value,thus caused K and MR a sudden jump. The ITF anomalies generally exist in the process of ductile fracturing of rock.

关 键 词：岩石力学 粉砂岩 红外温变场 统计分布 灾变预警 

分 类 号：TU45[建筑科学—岩土工程]