Experimental Study HUIZE Dolomitic Limestone Mechanical Properties

With the continuous development of national economy, the degree of dependence on energy resources is becoming more and more higher. Because of the shallow resources gradually dry up, deep exploitation of resources is imminent, in all kinds of underground engineering construction, it was found that rocks deep underground have many complex phenomenon, such as rock burst、 rock explosion、damage characteristics is abnormal、partitioning of rock mass fracture and so on.The existing rock mechanics knowledge cannot give a good explanation for these complex phenomenon. Based on the National Natural Science Foundation Project (Dynamic disturbance mechanism of inducing rock burst and the forecast method research) which was acquired in2010by Professor Zhou Zonghong, through the uniaxial compression test and one-dimensional static loading experiment to research the mechanical properties of dolomitic limestone.The test have been studied that is Dolomitic limestone of uniaxial compression test. Through the experiment,we got Dolomitic limestone’s uniaxial compressive strength, elastic modulus and poisson’s ratio, than under the condition of uniaxial compression to studied the characteristics of acoustic emission of olomitic limestone.It’s found that Dolomitic limestone under the condition of uniaxial compression had Certain characteristics on AE ringing counu、the cumulative AE energy、the cumulative AE. Finally, It’s found that load stress for rock uniaxial compressive strength of70%-80%, produced a large number of acoustic emission events, AE ringing count、the cumulative AE energy、the cumulative AE increase sharply, this phenomenon can be used as a sign of dolomitic limestone before destruction.The SHPB was Developed by Middle and Southern University, use it to studied Dolomitic limestone’s mechanical property which was under conventional dynamic loading or under one-dimensional static loading.Test scheme design for axial static pressure0Mpa、20Mpa、45Mpa, each group test have5rock sample. Research the mechanics characteristic of dolomitic limestone which under the conventional dynamic loading or under one-dimensional movement combination loading is for dolomitic limestone of the deformation and strength characteristics of the energy transfer regularity and failure mode has carried on the thorough research analysis.Based on the summary of the data analysis, dolomitic limestone under conventional dynamic impact load and one-dimensional static load under the action of the dynamic compressive strength than the rock under uniaxial static load under the action of static pressure strength more, the dynamic compressive strength is increased along with the increase of loading strain rate, unit volume absorption can present law of linear increase along with the change of the loading strain rate, deformation modulus does not change with strain rate. Also summarizes, dolomitic limestone under conventional dynamic impact load and one-dimensional movement under load under the action of failure mode is different, regular under dynamic impact loading, dolomitic limestone of burst mode for transverse tensile fracture, and one dimensional movement under combined loading, dolomitic limestone compression-shear fracture form.