| This paper is based on the field data and experimental data, according to the degree of relaxation,Fracture surface open width, weathered state, groundwater,wave velocity,Kv, RQD and other indicators, the deep deformation and fracture is divided into mild relaxation, moderate relaxation and strong relaxation type three types. From the spatial distribution, deformation and failure characteristics,velocity characteristics,RQD characteristics and geochemical characteristics of several aspects of different types of deformation and failure characteristics of the deep, it is different from the conventional unloading cranny. The wave velocity, rebound value, RQD of deep deformation decreased in different extent, can be obtained in the deep deformation is mainly from two aspects of rock mass integrity and strength of rock mass Quality influence.By means of Qualitative and Quantitative classification of combining the idea, using the conventional method of rock mass Quality classification(BQ,Q,RMR) were analyzed for the hydropower station in deep deformation and fracture of rock mass, find out the problems in the application of deep deformation and fracture of rock mass and correcting it. Finally set up a suitable Quality classification system of deep deformation and fracture of rock mass slope station. The research content mainly includes:(1)Using qualitative method,BQ,Q system,RMR to preliminary deep deformation and fracture of rock mass Quality classification. The following conclusion can be reached:①By a slight relaxation to strongly relaxation correlation coefficient between BQ, Q and RMR decreases gradually. That broken loose and broken deep deformation degree, the greater the impact on the quality of rock mass. Three classification methods of the main question is about the special geological conditions of deep deformation correction. Overall correlation, self-agreement and consistency between each method is poorer, mainly due to the consideration of different classification methods, deep deformation fracture development degree is different.②In the BQ method, deep deformation to break through on the quality of the rock mass integrity index of rock mass and rock strength to reflect, and other factors affecting the quality of rock mass is divided by qualitative to determine, to strengthen the deep deformation of rock mass strength and integrity, and the qualitative characteristics such as weakening the rock mass structure, lead to low classification results.③In Q system method, deep deformation impact on the quality of rock mass of its deformation is mainly through the rock quality index RQD to reflect, and deep deformation fracture development section, loose and broken rock mass, rock strength is reduced, and the Q system method does not take into account the rock strength, to consider deep deformation fracture rock mass is insufficient, lead to the classification results practical situation is on the high side.④In RMR classification method, deep deformation impact on the quality of rock mass of its deformation is mainly through the rock quality index RQD and rock strength. And deep deformation characteristics according to the classification results, slightly relaxed period to strengthen the deep impact on the quality of rock mass deformation burst, and strong relaxed period of deep deformation failure to consider the influence of the rock mass quality.(2)Deep the influence degree of the deformation and fracture of rock mass quality at different deep deformation of rock mass quality degradation degree is different. Degree of relaxation and fragmentation of deep deformation rock mass, it can be understood as the deterioration of the degree of deep deformation and fracture of rock Quality. In order to more intuitive show the deep deformation and fracture of rock mass Quality deterioration degree, introduce the volume of rock mass fracture number K, the K value is calculated according to the standard, the bigger K value, the more deep deformation and fracture of rock mass Quality deterioration degree. The conventional rock mass Quality classification method is suitable for deep deformation and fracture of rock mass, but the account is not sufficient, so the deep deformation and fracture characteristics and the degree of degradation for rock mass as the foundation, combining the Qualitative classification, the conventional classification method is modified:①The BQ method is modified to the integrity coefficient, the scene of the wear velocity values are great and effective single hole wave velocity, but the use of space geometric calculation effectively reflect the single hole wave velocity of deep deformation is limited. When all the sound value without a valid single hole wave velocity, used to wear wave velocity value to calculate coefficient of integrity. According to the volume of rock mass fracture number K and actual investigation, introduce the correction coefficient KBQ.②The Q system is mainly RQD and Kv values were unified,to reduce the difference between the method of parameters and improve the accuracy of classification results. The contact joint understanding for opening of joints, with joint opening to represent. According to the volume of rock mass fracture number and actual investigation, introduce deep deformation correction coefficient KQ.③The RMR method is mainly about the relationship between R1, R2, R3 and the score was modified, when 5≤Rc≤135, R1=0.0768Rc+1.5592; when 15≤RQD≤100,R2=0.1999RQD-0.2208, when 12≤d≤200,R3=0.0669d+7.1156.According to the volume of rock mass fracture number and actual investigation, introduce deep deformation correction coefficient KRMR.(3)Correlation,coincidence rate, consistence between the revised classification results for each grade, consistent with prior amendment has greatly increased, the modified BQ, Q, RMR method, combining the Qualitative classification of the hydropower station slope deep deformation and fracture of rock mass Quality classification system. According to the classification of rock mass Quality classification system for the development of deep deformation and fracture, to identify the Quality levels of deep deformation and fracture rock. The classification system of the better Quality of the consideration of the deep deformation and fracture of the influence on the rock mass, the promotion of a certain significance in deep deformation and fracture rock mass Quality classification. |
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