Study On The Stability Of Laneway Surrounding Rock Based On The Nondestructive Testing Of Rock Bolt Group Working Load

Bolt support relative to the shelf-type support is a proactive approach can save a lot of steel, thereby reducing support costs and the workload of supporting roadway; its advantage is the other way unparalleled support, so bolting in the mining, water, tunnels and other projects were widely used. For bolting roadway or the stability of surrounding rock has also been growing concern about engineering and technical personnel, many researchers from different angles to determine its stability and forecast in-depth research, most studies In accordance with the static solid mechanics research methods, the deformation of the rock as the main object of study, but the surrounding rock stability is strongly influenced by mining activities, leading to stress redistribution and the rock surrounding a wide range of mobile And rupture, so the static theory based on observation methods and test equipment are measured data of surrounding rock stability is lagging behind, and the resulting stability of surrounding rock to make forecasts, and then taken to a passive control measures, so we are committed to a study on the stability of surrounding rock in real time to fast, accurate forecasts, to determine the method. With the computer technology and the rapid development of modern detection techniques, in the roadway, the stability of surrounding rock and the process of prediction and failure mechanism of the injury diagnosis there have been some intelligent and dynamic testing methods, such as electromagnetic radiation ultrasonic,acoustic emission and ground penetrating radar, so that we may directly measured the pressure variation of mining key to the stability of the surrounding factors. Research and practice based on knowledge of surrounding rock stability, anchor-based non-destructive testing, based on the proposed structure determination and stability of surrounding rock anchor group predicted a new way:through non-destructive testing work by bolt load real-time group to evaluate the stability of surrounding rock.The main contents of this paper is to tunnel through the anchor group of dynamic response (velocity, acceleration) of the non-destructive testing and real-time analysis of changes in work load for anchor information to predict, determine the stability of surrounding rock. Contents are as follows:(1) Through the anchor role to anchor the principle and the connotation of surrounding rock of damage law, get anchor rod and the connotation of surrounding rock interaction for the method in this paper, provides the theory basis.(2) Study of stress wave in the propagation law of stress wave parameters, establish working load and bolt the quantitative relationship between working load, solve anchor the key problems of nondestructive testing technology. (3) By indoor analog simulation experiment study nondestructive testing anchor the feasibility of the method and working load working load anchor with the relationship between wallrock deformation, revealing drift wallrock deformation, destruction, process anchor group work load change rule.(4) With CMT (A) anchor elastic wave nondestructive detector and analysis software in countries on industrial test Yang two ore by nondestructive testing, study the structure of anchor cable group working load the feasibility of judge the stability of surrounding rock.Through theoretical study and laboratory, industrial and experiment shows that stress wave nondestructive testing methods through the determination of work load bolt group to predict, determine the stability of rock structures anchoring group is a fast and effective stability of surrounding rock forecasting, decision method, which can make real judgments on the stability of surrounding rock, bolt support structure for the optimal design of reinforcement to provide timely and reliable basis for decision making.