A method and system for calculating rock strength using data while drilling

Abstract

A method and system for calculating rock strength by using logging-while-drilling data. The method comprises the following steps: step 1, preprocessing a data sample set of the collected logging-while-drilling parameters (S110); step 2, analyzing the preprocessed data set of the logging-while-drilling parameters, using different data dimension reduction methods to determine the relationships and contribution rates of variables in the logging-while-drilling parameters, using an ordered weighted average operator method to calculate the plurality of weighted average contribution rates of each variable of the logging-while-drilling parameters, and determining the main characteristic parameters in the logging-while-drilling parameters by sorting and optimizing according to the combined contribution rates, and using the mechanical testing of rock strength to obtain the compressive strength of surrounding rocks of different grades (S120); and step 3, establishing a mathematical model between the uniaxial compressive strength and the main characteristic parameters of the rocks of different grades based on the data obtained in step 2 to evaluate the uniaxial compressive strength of the rock (S130). By means of the method, the strength of the rock can be obtained more simply and efficiently.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a method and a system for calculating rock strength by applying data while drilling. Background technique [0002] Rock (mass) property evaluation is the basic work required for mining, tunneling, water conservancy and other rock (body) projects as the research object, and is a necessary process for surrounding rock classification, stability prediction, and support design. If there is no physical and mechanical parameters of the engineering rock (body) as a basis, the equipment selection of the engineering project will also be blindly selected, resulting in frequent failures or accidents during the work process and delaying the construction period. Therefore, it is very important to understand the rock (mass) properties before carrying out engineering projects. [0003] The strength index of rock plays an important role in the design, construction, and later maintenance of r...

AI Technical Summary

Problems solved by technology

Rock engineering is a combination of natural materials and artificial materials. Insufficient knowledge of rock strength and other characteristic parameters will lead to design and construction defects, which may cause different degrees of damage to the project and cause serious losses.

[0004] Traditionally, the most direct way to obtain rock formation data is geological drilling. This work can directly obtain underground rock and soil samples. Through coring, geotechnical and rock mechanics experiments, high-precision data can be obtained based on laboratory analysis, and the most accurate However, this method generally accounts for 10% to 35% of the survey engineering cost, which requires a lot of manpower and material resources, and it is impossible to completely simulate the rock boundary and force boundary in the laboratory state, and some tunnels (weak interlayer, broken bands, etc.) may not be able to get the core and cause discontinuity

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