Large Deformation Of Rock Scene Test And Engineering Application

Xiangjiaba hydropower station dam region is extremely complex lithology structure,Left side with large scale expose extrusion,more than 10m in thickness.It is up to 50 m,poor characters,altitude in the flat,there are many in the river dam.Because ti have given size and characters and distribution,the extrusion of engineering have great influence.If we are not correct evaluation of mechanical parameters and squeezing by sex,it will directly influence the construction treatment measures.Even affect the future concrete gravity dam and related facilities of the safe operation.But according to the field investigation and test results,extrusion belt by excavation,blasting effect is large.Under the condition of exposure the fracturezone had happened serious relaxation,rules and regulations of the conventional method of deformation test site deformation modulus is extremely low,so we are unable to obtain in-situ conditions of distortion parameters.It make evaluation with availability,accurately obtain displacement and bad aspects of rock space position, problems and challenges encountered tremendous.Results is directly related to this world class engineering xiangjiaba hydropower station of success.In view of this,in the large deformation paper experiment instrument development,cover conditions deformation modulus calculation formula, etc.Major achievements made below:( 1 ) In the dam foundation excavation based on the detailed investigation and measurement,combined with the exploration data revealed results,author had constructed a three dimensional space model,author had won the leftbank extrusion with space development characteristics,author determined accurately with the dam in the excavation under the bearing surface position and location distribution.(2)Through the investigation and test results, author determined the leftbank extrusion of material composition, properties and structure elements(3)For the excavation of the broken belt in expose author done the conventional rigid standard pressure plate method on-site deformation.Author revealed the broken belt change environment conditions, low modulus is flabby, with characteristics of conventional test methods to obtain in-situ conditions of distortion parameters.(4)In hydropower engineering rock testing procedures stipulated in the field of deformation rigid compression test for basic theoretical basis,author conducted on-site large deformation test instrument design.The design of the instrument can be confined plate in 5000cm2 area, the maximum output 450 tons of deformation test. (5)In order to ensure that the fracture zone obtain more accurate in-situ conditions of deformation modulus,in the process of test in large deformation we must take part in the cover of the thickness of reserve shall be protected.We must prevent fracture zone of slack to happen deformation modulus distortion.Based on the theory of elastic mechanics,author in the paper deduced caprocks conditions broken belt deformation modulus calculation formula of the theory.(6)Author use the apparatus in the design in different conditions with heavy cover large deformation test.Author adopt 3d finite element software calculating and analyzing the different depth, the stress and deformation of rock mass.Calculation results are consistent with the experimental results,so it proves the experimental method and calculation formula of the accuracy and rationality.(7)According to the test results,author obtained with different environment comprehensive deformation modulus.