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在岩土工程取样过程中,取土器贯入会引起土样扰动变形,造成土样物理力学性质的改变。为了研究取土器贯入过程中土体扰动变形特性及其影响因素,基于透明土及PIV技术,进行了不同尺寸、不同贯入速率的取土器贯入试验,得到了取土器贯入过程中土体扰动变形场的分布特性及规律。模型试验结果表明:土体扰动变形随着贯入深度增大而增大,管内土体表现为向上的隆起变形,在深度方向最大变形基本位于深度20 mm处;增大取土器内径能有效减小轴线处土体扰动变形,但减小幅度随着内径的增大而减小;增大取土器贯入速率不能有效地减小结构性较弱的砂性土样的扰动变形。
During geotechnical sampling, earth borrowing will lead to disturbances and deformations of soil samples, resulting in the change of physical and mechanical properties of soil samples. In order to study the soil disturbance and deformation characteristics and its influencing factors during the earth penetration process of earth borrower, based on the transparent soil and PIV technology, the penetration tests of earth borrowers with different sizes and penetration rates were carried out. DISTRIBUTION CHARACTERISTICS AND LAW OF BODY DISTURBING DEFORMATION FIELD. The results of model tests show that the soil disturbance increases with the penetration depth increasing, and the soil in the tube shows uplift deformation with the maximum deformation in the depth direction being basically at the depth of 20 mm. Increasing the inner diameter of the earth cutter can effectively reduce However, the decreasing amplitude decreases with the increase of the inner diameter. Increasing the penetration rate of the earth borrower can not effectively reduce the disturbance deformation of sandy soil samples with weak structure.