【摘要】 精确地评价土的力学性质,提供可信赖的设计参数,对基础工程设计具有重要的现实意义。现有的试验方法中,土的强度和变形参数由精度相异的不同试验方法得出,并且不可避免地存在不同程度地扰动土体,释放土中应力。研制的自钻式原位剪切旁压试验方法(self-boring in-situ shear pressuremeter test)。结合常规的旁压试验和室内直剪试验之长,采用自钻式钻进,将测定器插入到预定深度,尽可能地减少土体的扰动,较好地保持了土中的原始应力;其独特的结构和加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,还能获得土的静止土压力P0、剪切反力系数Cs,评价桩周摩擦力f等力学参数。由于它是一种在钻孔内的测试技术,所以能获得不同深度土的力学参数。更多还原

【Abstract】 It is of great importance to precisely appraise the mechanic characteristics and provide credible design parameters of soils for the design of foundation engineering. At present,the strength and deformation parameters are tested by different test methods whose precisions differ from each other,and the soils are disturbed inevitably to some degree,so are the stresses in the soils. The self-boring in-situ shear pressuremeter test,on the basis of the conventional pressuremeter test and the indoor direct shear test,adopts the self-boring technique,sends the probe to the preplanned depth of soils,tries its best to reduce the disturbance and holds the initial stresses in the earth. The unique structure and loading method make it possible to directly attain many mechanic parameters,such as the strength and deformation parameters,earth pressure at rest,coefficients of subgrade shear reaction,pile friction and so on. And the self-boring in-situ shear pressuremeter test is a testing technique in the drilling boreholes,so it can obtain the mechanic parameters of different depths in the soils.更多还原