Research On The Value Method Of Rock Mass Mechanical Parameters Based On Multi-attribute Decision-making And Spatial Interpolation

The value of rock mechanics is the most basic and most important work in the construction and design of large-scale rock and soil.The correctness of this value is related to the safety and economic benefit of engineering construction,it is a problem has to be solved that determining the design value of rock mass mechanics parameters scientific and reasonable in practical engineering.At present,it is reasonable to use a variety of methods to determine the mechanical parameters of the rock mass in the large-scale project,but this kind of comprehensive method is basically simple or artificial.This method does not form a practical method to use the value of the method so there is no promotion.Engineering rock mechanics parameters are generally based on a finite number of spatial point parameter data to determine the final design value,and the actual anisotropy characteristics do not match.This paper based on the basis of previous research,proposes multi attribute decision making integrated value method and random correlation comprehensive spatial interpolation method,to determine the value of design value of rock mechanics parameters in engineering space and the value of engineering rock mechanics parameters.In the first approach,the weighted averaging method is used to determine the spatial rock mass mechanical parameters,which replace the traditional method of determining design values using simple averaging or artificial methods.In the second method,the mechanical parameter values of the rock mass are determined by using the data of rock mechanics parameters determined by enough space point rock mass values to deteirmine the design values of the mechanical parameters of engineering rock mass.Through these two methods,it is possible to obtain more scientific and reasonable design values of mechanical parameters of engineering space point and design values of engineering rock mechanics parameters;On this basis,this paper presents a method to establish the three-dimensional geological model of rock mechanics parameterization data with data of spatial rock mechanics data points.The model is a kind of data which can store a lot of space rock mechanics data Database,it is convenient to store a large amount of complicated engineering data,and to select the mechanical parameters of the rock mass in the design and construction in the practical engineering.This paper mainly includes the following aspects:(1)Based on multiple attribute decision making and geostatistics,this paper puts forward the multiple attribute decision making method of Engineering spatial point rock mechanics and the method of random correlation spatial interpolation for engineering rock mass mechanical parameters.The first method uses weighted averaging to determine parameter values.The second method replaces the traditional methods by using enough spatial point parameter data to be determined.These two methods make the determined rock mass mechanics parameters more accurate,more in line with the engineering practice,and have certain practical engineering.(2)Aiming at the deficiency of the method of determining the mechanical parameters of rock mass and the value of the mechanical parameters of the rock mass at the point of space.Based on multiple attribute decision making,the comprehensive evaluation value of the reliability of the evaluation object can be obtained.In order to determine the reasonable weight of each method,firstly,based on the importance of each attribute and method,the comprehensive evaluation value of each parameter determination method is obtained according to the multi-attribute decision-making.Then,the comprehensive evaluation value is used as the weight of the method,each method has the weighted average of the parameter value of the method,and finally obtains the reasonable design value of the spatial point rock mass parameter.(3)The mechanical parameters of engineering rock mass design value determined by the limited space point data,which are not consistent with the actual situation of engineering geological statistics,spatial interpolation method in rock mechanics parameters of spatial interpolation has a deficiency.Based on the spatial interpolation method,a sufficient number of spatial point parameter data can be obtained.Based on the theory of geostatistics,this paper proposes a stochastic-associative spatial interpolation method for engineering rock mechanics parameters.The method firstly determines the spatial distribution function(variation function)of the parameters in a small amount of known spatial point parameter data in engineering practice.Combined with the distribution function and the known point data to determine a sufficient number of unknown spatial point parameter data,and finally based on these data to determine the engineering rock mechanics parameter design value.(4)Based on BIM technology,the three-dimensional geologic model of rock mechanics parameter information was established on the basis of Civil3D software and Revit software combined with the values of mechanical parameters of all known spatial points.