基于多曲率压头的钻孔横向贯入仪研制及其初步应用

发布时间：2018-05-04 15:30

本文选题：岩石力学 + Hertz接触问题　；参考：《岩石力学与工程学报》2015年09期

【摘要】：针对深部岩土工程岩石参数获取成本高的问题,借鉴压痕试验技术,研制钻孔横向贯入仪,用于在钻孔中测定岩石的相关力学参数。该设备具有便携、快捷、高效、低成本的特点。该设备通过获取4个不同曲率半径的压头在压入过程中的载荷位移曲线,并对这些曲线进行分析从而获取岩石的相关力学参数。在大理石上进行钻孔横向贯入仪的初步应用,并在试验中引入声发射监测塑性变形的发展情况,揭示试验的压入曲线特性,从试验曲线中提取岩石的模量,通过与单轴试验结果进行对比,用钻孔横向贯入仪试验曲线提取的模量介于单轴试验的割线模量和弹性模量之间,并且与割线模量较为接近。认为钻孔横向贯入仪的试验结果可以代表现场岩石的力学参数,可供工程参考。
[Abstract]:In order to solve the problem of high cost of obtaining rock parameters in deep geotechnical engineering, a horizontal penetration instrument is developed for measuring the mechanical parameters of rock in borehole by using indentation test technology. The device is portable, fast, efficient and low-cost. By obtaining the load-displacement curves of four heads with different radii of curvature in the process of indentation, and analyzing these curves, the mechanical parameters of rock can be obtained. The preliminary application of the drill hole transverse penetration instrument on marble is carried out, and the development of acoustic emission monitoring plastic deformation is introduced in the test. The characteristics of the indentation curve are revealed, and the modulus of rock is extracted from the test curve. Compared with the results of uniaxial test, the modulus extracted by the borehole transverse penetration test curve is between the Secant modulus and the elastic modulus of the uniaxial test, and is close to the Secant modulus. It is considered that the test results of the borehole transverse penetration instrument can represent the mechanical parameters of the rock in the field and can be used for engineering reference.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中冶北方工程技术有限公司;九州大学工学府建设系;
【基金】：中国中冶“三五”重大科技专项
【分类号】：TU45

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