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Abstract Drillhole penetrometer instrument is developed to solve the high cost problems existing in acquiring the rock parameters in deep geotechnical engineering；it uses the technology of indentation test for references and is applied to measure the rock?s mechanical parameters in drillhole. This apparatus was characterized by portable，convenience，efficiency，and low-cost. The apparatus would acquire the load-displacement curves produced by four indenters with different curvature radiuses in the process of loading. The elastic-plastic parameters could be acquired by the analysis of these curves. The preliminary application of drillhole penetrometer instrument was conducted on the marble，and during which the plastic deformation development situation was monitored by introducing acoustic emission technology，and thus show us the characteristics of the identification curves. The elastic modulus value was acquired through the relevant research curves and then according to the contrast between the results of this research and uniaxial compression test，the modulus value extracted through the curves of drillhole penetrometer instrument is between the value of secant modulus and modulus of elasticity in uniaxial compression test and is closer to secant modulus. As a result，it scientifically proves that the research results acquired through drillhole penetrometer instrument can represent the mechanical parameters in field rock.
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2015, Vol. 34 
