An evaluation method for unloading relaxation of high dam rock mass based on fusion of test and monitoring data mining

Abstract

The invention discloses a method for evaluating unloading and relaxation of high dam rock mass by combining test and monitoring data mining. Firstly, based on the different degrees of quality reduction of rock mass at different depth positions, the variation coefficient of longitudinal wave velocity in non-columnar joint rock mass and The relationship between the impact on the quality of the rock mass; then, combined with the indoor test of the acoustic wave testing system, the relationship between the change coefficient of the longitudinal wave velocity in the rock mass after the excavation of the columnar joint rock mass and the impact on the quality of the rock mass is determined; the introduction of lithology, structural plane , protective layer and other factors, establish a method for estimating the relaxation depth of the untested area after excavation of the dam foundation. The invention considers the influence of engineering rock mass lithology, structure surface exposure and excavation measures on the unloading relaxation depth after rock mass excavation, which is more scientific and more in line with actual engineering conditions. This estimation method can provide a criterion for the excavation of high dam foundation rock mass engineering, and has strong practicability and wide applicability.

Description

technical field [0001] The invention belongs to the fields of hydraulic structures and geotechnical engineering, and in particular relates to an evaluation method for unloading relaxation of high dam rock mass which combines test and monitoring data mining. Background technique [0002] The unloading relaxation phenomenon of dam foundation rock mass during the excavation process is an important problem in the construction of high dam projects. The distribution of unloading relaxation characteristics of dam foundation rock mass is of great significance to the long-term safety of dam construction and later operation. At present, the drilling acoustic wave testing technology is often used to detect the excavated dam foundation rock mass, but when it comes to the evaluation of unloading relaxation of complex rock mass such as columnar joint rock mass, there is no clear criterion for judging it. In addition, the borehole acoustic testing technology can only detect the rock mass ...

AI Technical Summary

Problems solved by technology

At present, the drilling acoustic wave testing technology is often used to detect the rock mass of the excavated dam foundation, but when it comes to the unloading and relaxation evaluation of complex rock mass such as columnar joint rock mass, there is no clear criterion for judging

In addition, the drilling acoustic wave testing technology can only detect the rock mass near the borehole, and the spatial interpolation method is often used to estimate the relaxation degree of the rock mass in the untested area. However, the results obtained by the linear difference method often have large errors with the actual situation.

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