Study On The Correlation Between Physical And Mechanical Properties Of Rocks In Coal Measure Strata And Logging Curve Parameters

The study area—Luo Yuan mine field which is located in Fu Feng thrust nappe structure,and whose geologic structural complexity is higher than the medium level. There are many faults and structural fissures in this area, lithology of clip stratigraphic is more broken and there exist soft interlayers and local fracture zones in the bottom and top beds of primary mineable coal beds, so the engineering geological condition is poor. Considering the complexity of geological structure and engineering geological condition of coal measure strata are very complex, how to layout transport tunnels and main return ways of different mining levels reasonably, not only affects capital construction investment and construction speed of the mine field, but also affects its normal production. Physical and mechanical properties of rocks in coal measure strata are important factors in deciding layout of roadway in mine field,therefore, a comprehensive understanding of physical and mechanical properties of rocks in coal measure strata has important guiding significance for reasonable selection of layout ways and excavation and supporting of roadway.Compared with those conventional methods of obtaining rock physical and mechanical parameters, the coalfield geophysical logging method has many merits,for example,it is simple,won't disturb natural structure and natural stress state of measured rock,and can be carried on extensively in various parts of rock.Moreover, logging curves, as a result of geophysical logging, can carry large amounts of continuous geological information on rocks in coal measure strata. Therefore,using limited core experimental data and logging curves to predict quantitatively physical and mechanical properties of rocks in coal measure strata has important theoretical significance.In this paper, we use geophysical logging curves of shaft-hole coal segment in Luo Yuan mine field and experimental data of physical and mechanical properties of sampling cores to do single-factor correlation analysis of rock physical and mechanical parameters of different lithology in coal measure strata and geophysical logging curve amplitude parameters.We obtained logging curve amplitude parameters which have more obvious correlation with rock physical and mechanical parameters of different lithology in coal measure strata through analysis.And then,this paper regards rock physical and mechanical parameters and logging curve amplitude parameters as dependent variable and independent variable respectively,and do unary linear regression analysis and multiple linear regression analysis.The result shows regression equations and regression coefficients determined have a high level of significance, and regression model which has the least regression residual error is regarded as ideal prediction model of rock physical and mechanical parameters in coal measure strata. At last,this paper use the prediction model to predict rock physical and mechanical parameters of different lithology in the extended section to coal measure strata which is in the auxiliary shaft shaft-hole,and examine application effect of the prediction model.Figure [34] table [69] reference [80]...