Device for preparing remolded sandy soil sample by using rotary sand rain method

Abstract

The invention belongs to the field of geotechnical tests, and relates to a device for preparing a remolded sandy soil sample by using a rotary sand rain method. The device comprises a fixing frame forfixing a mold, a vertical rod rotationally arranged on the fixing frame along the axis of the fixing frame, and a funnel arranged on the vertical rod and movably arranged in the extension direction of the vertical rod. According to the device, the manual operation amount can be reduced, and through the cooperation between the lifting rod and the vertical rod and the arrangement positions of the first positioning hole and the second positioning hole, the consistent height of each layer of the sample is ensured; uniform throwing in the sample layer is ensured through the rotation of the funnel;accurate control of the sandy soil throwing height is ensured through the position of the hammer ball; and the mold is fixed through the fixing frame, the stability of the mold is improved, and the mold is prevented from inclining.

Description

technical field [0001] The invention belongs to the field of geotechnical tests, and relates to a device for preparing remolded sand samples by a rotating sand rain method. Background technique [0002] At present, in indoor geotechnical tests, the reshaped sand sample is usually prepared by the sand rain method, that is, with the help of tools such as a long-necked funnel, the sand sample is poured into the sample preparation mold under the action of gravity, and then the reshaped soil sample is obtained. Plastic sand samples. [0003] When preparing samples by the sand rain method, a mold cylinder that matches the size of the sample is usually used. For example, the triaxial sample is formed into a mold cylinder, which is a cylinder, and the sample is divided into several layers to prepare. When preparing samples, first calculate the required sand quality for each layer, then pour a layer of sand into the cylinder through the funnel, vibrate and compact as required, and ...

AI Technical Summary

Problems solved by technology

[0006] The existing sample preparation method is fully manual operation

When preparing samples, the height of each layer of samples needs to be measured manually with a ruler, and the control accuracy of the height of each layer is low, resulting in poor vertical uniformity of the samples

Using a funnel to manually sprinkle, it is easy to cause too much sand in some places and less in other places, resulting in uneven distribution of samples along the horizontal plane

The inhomogeneity of the sample in two dimensions leads to poor sample preparation and repeatability. Although the follow-up test operation is the same, there will be some differences in the test results, which reduces the reliability of the test data.

[0007] The experimenter holds the funnel to throw the sand to form a sample. The height of the funnel determines the height of the sand, so the control of the height depends heavily on the experience of the operator.

The different heights also lead to uncontrollable compactness of the sand along the longitudinal direction, and the uniformity of the sample is poor

The molding cylinder is a slender cylinder with poor stability and prone to tilt during sample preparation

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