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Experimental Analysis and Mathematical Simulation on the Strength Characteristics of Limestone

GUO Zhonghua et al. [  
The strength characteristics of limestone are studied in this paper. The non linear relationship between uniaxial compressive strength and the ratio of highness to diameter, and the non linear relationship between uniaxial compressive strength and cross section in natural and saturation condition are presented separately. The relationship formulas are very convenient to provide consultation and reference for evaluating the strength of the resemble rock in the related engineering. The rock under in situ conditions is always in the state of three dimensional compression, so the laboratory triaxial compression test is the relatively true reflection of the stress state of the rock. Aiming at the results of triaxial compression test, the curves of stress strain relationship of limestone are analyzed and compared and then fitted as well. The results indicate that the procedure of limestone deformation can be divided into four different stages. The stress strain relationship is affected a great deal by the lateral stress and the stress strain relationship can be fitted ideally by polynominal function. [
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