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精确地评价土的力学性质,提供可信赖的设计参数,对岩土工程设计具有重要的现实意义。在现有的试验方法中,土的强度和变形参数是由精度相异的不同试验方法得出的,并且不可避免存在不同程度地扰动土体结构,释放土中应力。自钻式原位剪切旁压仪采用自钻式钻进,其独特的结构和加载方式使该方法能够同时直接测出土的强度和变形参数,还能得到静止土压力、剪切反力系数,评价桩周摩擦力等力学参数。由于它是一种在钻孔内的测试技术,所以能获得土层中不同深度的力学参数。试验结果表明,自钻式原位剪切旁压仪特别适合于难易采样、制样的易扰动、强度低的土层,如砂性土、淤泥质土的强度试验。
Accurately evaluating the mechanical properties of soil and providing reliable design parameters have important practical significance for geotechnical engineering design. In the existing test methods, the strength and deformation parameters of soil are determined by different test methods with different precision, and inevitably there are some disturbances on the soil structure and soil stress. Self-drilling in-situ shear by-pass shear using self-drilling, its unique structure and loading method allows the method to simultaneously measure soil strength and deformation parameters directly, but also get the static earth pressure, shear reaction coefficient , Evaluate the mechanical parameters such as pile friction. Since it is a test technique in the borehole, mechanical parameters of different depths in the soil layer can be obtained. The test results show that self-drilling in-situ shear in-line pressure gauge is particularly suitable for the strength test of difficult-to-sample, sample-making easily disturbed and low strength soil such as sandy soil and silty soil.