Digital Acquisition And Information Representation Method Of Tunnel Surrounding Rock Mass And Engineering Applications

In the tunnel and underground engineering,the stability analysis and quality evaluation of the rock mass is an important part of the geotechnical engineering planning and safe construction process,and the geological information of the rock structural plane is the basis of stability analysis and safety evaluation of the surrounding rock mass.The rapid and accurate acquisition of the information of rock mass structure is of great significance to the quality evaluation of rock mass.In the tunnel and underground engineering,the traditional collection method of rock structural plane information is faced with the problems of poor timeliness,extra manpower and resources cost and low efficiency.Now the emerging digital acquisition method of rock structure information has much advantages in the speed,convenience and preservation.But,troubled by the dimming and dusty environment,the goal of gathering rock structure image fastly and clearly can not be achieved.In the face of the above related problems,a strong guarantee for the safety in tunnel engineering design and construction will be provided through the study and optimization of rock structural plane information acquisition and analysis method.(1)The environmental sensitivity of the collected equipment and the best acquisition mode of the rock mass structure are summarized.Based on the dimming and dusty environment of the tunnel,the environmental monitoring instruments were used to quantify the parameters of temperature and humidity,brightness and dust concentration in the field environment,and the light intensity and dust concentration were controlled as single variables respectively.The test equipment was analyzed at different dust concentration and different light Strength of the best collection mode and the degree of environmental sensitivity.And through the theoretical analysis and field test demonstration of near infrared ray imaging technology to overcome the harsh environment of the feasibility of the tunnel to determine the best infrared acquisition band.(2)Using digital image processing technology,the study of rock mass image enhancement and geological information acquisition.On the one hand,the image enhancement method of the face image is studied by using the gray level transformation process and the histogram equalization of the point operation level.On the other hand,the aerial image filtering enhancement method of the group operation level is used to remove the noise of the rock mass.Image quality enhancement,highlighting the characteristics of rock structural surface information.In the direction of structural surface extraction,a variety of edge detection methods are implemented,and automatic and manual correction is completed according to the detection edge to realize the extraction of the edge of the structure plane.(3)The spatial anisotropy evaluation system of tunnel rock mass is constructed based on the tunnel radial RQD,and the spatial structure characteristics of the surrounding rock are divided into two groups.The spatial characteristics of the rock mass are calculated by the feature extraction technique.Rock anchoring support related parameters.(4)The spatial anisotropy evaluation system of tunnel rock mass is constructed based on the tunnel radial RQD,and the spatial structure characteristics of the surrounding rock are divided into two groups.The spatial characteristics of the rock mass are calculated by the feature extraction technique.Rock anchoring support related parameters.