取土器贯入扰动变形规律透明土试验研究

发布时间：2018-02-20 20:26

本文关键词： 取土器扰动变形透明土 PIV技术贯入速率　出处：《岩土工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In the sampling process of geotechnical engineering, the soil sample disturbance deformation will be caused by the penetration of the soil sampling device, and the physical and mechanical properties of the soil sample will be changed. In order to study the soil disturbance deformation characteristics and its influencing factors during the soil sampling process, based on the transparent soil and PIV technology, Different size and different penetration rate were carried out, and the distribution characteristics and rules of soil disturbance deformation field were obtained. The model test results show that the soil disturbance deformation increases with the depth of penetration, and the results of the model test show that the soil disturbance deformation increases with the depth of penetration, and the model test results show that the soil disturbance deformation increases with the increase of penetration depth. The soil in the pipe shows upward uplift deformation, the maximum deformation in the depth direction is basically located at the depth of 20 mm, and the increase of the inner diameter of the soil collector can effectively reduce the soil disturbance deformation at the axis, but the decrease amplitude decreases with the increase of the inner diameter. Increasing the penetration rate of soil collector can not effectively reduce the disturbed deformation of sand soil samples with weak structure.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金项目(51279049) 中央高校基本科研业务费项目(2015B025914)
【分类号】：TU411

【相似文献】