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Abstract In order to carry out the in-situ rotary penetration test for determining the mechanical parameters of soft rock quickly and accurately，the intrinsic relationship between mechanical parameters of soft rock and load parameters of rotary penetration test should be known. The soft rock with uniaxial compression strength less than 15 MPa is simulated by the building block，gypsum A，gypsum B and mould gypsum samples. The uniaxial compressive test，shear test and rotary penetrometer test with two kinds of probes with the same diameter of pore-forming are carried out under the same experimental conditions. The axial force and torque of the probe，and the compression strength，Young?s modulus and shear strength of the sample are obtained. In the light of the similarity between cutter?s loading mode in rotary penetrometer test and plate?s loading modes in uniaxial compressive test and shear test，the mathematical model of load parameters in rotary penetration test and mechanical parameters in uniaxial compressive test is established theoretically，which is the intrinsic relationship of the two kinds of parameters. When the sample is at the stage of local volume damage during penetration test， the axial force and torque are not only related to the compression strength，cohesion and internal friction angle，except Young?s modulus，but also linearly increasing with the compression strength and cohesion. When the sample is at the stage of grinding damage，the axial force and torque are related to the Young?s modulus，cohesion and internal friction angle except the compression strength.
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Received: 08 November 2010
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2011, Vol. 30 
