CN210863597U - Portable geotechnical rheometer for CT scanning - Google Patents

Abstract

The utility model provides a portable geotechnique's rheometer for CT scanning, include: the weight, the weight tray, the displacement sensor, the dowel bar, the side limiter, the cushion block and the transparent toughened glass; the transparent toughened glass surrounds and forms a cavity with an upward opening, and the sample is filled in the cavity; the cushion block enters the cavity through the opening and is extruded with the sample; one end of the dowel bar is connected to one side of the cushion block, which is far away from the sample, and the other end of the dowel bar is connected to the lower surface of the weight tray; weights are arranged on the upper surface of the weight tray; the side limiter is arranged on the side surface of the dowel bar and used for reducing the lateral deformation of the dowel bar; the dowel bar transmits the load of the weight to the sample, and the displacement sensor is used for measuring the displacement of the sample after the load is applied to the sample; the CT scanner conducts nondestructive observation on the rheological process of the sample through the transparent toughened glass, and the internal structure of the sample is visually given under the condition that the original shape of the sample is not damaged. The portable geotechnical rheometer for CT scanning can record deformation data in real time.

Description

Portable geotechnical rheometer for CT scanning

Technical Field

The utility model relates to a portable geotechnique's rheometer that can be used to CT scanning.

Background

The rheological test is a conventional test in the soil engineering test and is mainly used for measuring the correlation of the stress and the strain of a soil body under a long time. Rheology is mainly caused by the rearrangement of particle sliding, rolling, etc. The study of soil rheological properties plays an important role in soil mechanics. Not only is the long-term mechanical behavior of the soil closely related to the creep properties in problems such as building settlement, slope and tunnel deformation, but also the study of the microscopic characteristics during creep is beneficial to mechanistically recognize and understand the deformation and strength characteristics of the soil.

At present, a weight load applying mode is used on an earth work shear rheometer for shear rheological tests. The CT scanning equipment realizes nondestructive observation of rock detail deformation and damage under the action of single-axis or three-axis load under the condition of no unloading. Therefore, the one-dimensional rheometer for CT scanning is established, and toughened glass is used outside the sample container, so that the sample is protected, and the subsequent CT scanning is facilitated. The strength of soil is lower than that of rock, and the load is considered to be applied by weight. Meanwhile, the displacement sensor can record deformation data in real time. Therefore, it is considered to establish a removable additional displacement sensor for the geotechnical rheological instrument for CT scanning. Compared with the traditional geotechnical rheological instrument, the instrument is detachable, convenient to carry and capable of recording deformation data in real time. The method can be used for CT scanning and realizes nondestructive observation of the detail of the sample in the rheological process.

SUMMERY OF THE UTILITY MODEL

The defects that the traditional soil engineering rheometer cannot easily monitor the deformation of a test piece in real time, is inconvenient to carry and cannot observe the internal structure of the test piece in the rheological process are overcome. The utility model discloses the main technical problem that will solve establishes a portable geotechnological rheometer for CT scanning on traditional rheometer's basis, can real-time recording deformation data.

In order to solve the technical problem, the utility model provides a portable geotechnique's rheometer for CT scanning, include: the weight, the weight tray, the displacement sensor, the dowel bar, the side limiter, the cushion block and the transparent toughened glass;

the transparent toughened glass surrounds to form a cavity with an upward opening, and a sample is filled in the cavity; the cushion block enters the cavity through the opening and is extruded with the sample;

one end of the dowel bar is connected to one side, far away from the sample, of the cushion block, and the other end of the dowel bar is connected to the lower surface of the weight tray; weights are arranged on the upper surface of the weight tray; the side limiter is arranged on the side surface of the dowel bar and used for reducing the lateral deformation of the dowel bar; the dowel bar transmits the load of the weight to the sample, and the displacement sensor is used for measuring the displacement of the sample after the load is applied to the sample;

the CT scanner conducts nondestructive observation on the rheological process of the sample through the transparent toughened glass, and the internal structure of the sample is visually given under the condition that the original shape of the sample is not damaged.

Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:

the utility model provides a pair of a portable geotechnological rheometer for CT scanning provides the constant stress condition through the weight, and displacement sensor changes displacement signal into measurable signal of telecommunication and shows direct reading through the displacement display appearance. And obtaining a series of CT images of the sample in the rheological process by using a CT scanner to obtain the internal condition of the sample in the rheological process.

Therefore, the internal condition of the sample in the rheological process can be visually obtained through the geotechnical rheometer, a series of subsequent researches can be favorably developed, the internal structure of the sample can be visually provided by CT (computed tomography) under the condition that the sample is not damaged, and the geotechnical rheometer is detachable, convenient to carry and capable of recording deformation data in real time. The method can be used for CT scanning and realizes nondestructive observation of the detail of the sample in the rheological process.

Drawings

Fig. 1 is a schematic view of a portable geotechnical rheometer for CT scanning in a preferred embodiment of the invention;

fig. 2 is a block diagram of a CT scanner according to a preferred embodiment of the present invention.

The meanings of the symbols in the figure are as follows:

1-weight, 2-weight disc, 3-displacement sensor, 4-force transmission rod, 5-side limiter, 6-cushion block, 7-sample, 8-transparent toughened glass, 9-X-ray generator, 10-ray detector and 11-computer system.

Detailed Description

The technical solution of the present invention is further explained below according to the drawings and the specific embodiments.

Referring to fig. 1 and 2, a portable rheometer for geotechnical use in CT scanning, comprising: the weight 1, the weight tray 2, the displacement sensor 3, the dowel bar 4, the side limiter 5, the cushion block 6 and the transparent toughened glass 8;

the transparent toughened glass 8 surrounds and forms a cavity with an upward opening, and the sample 7 is filled in the cavity; the cushion block 6 enters the chamber through the opening and is extruded with the sample 7;

one end of the dowel bar 4 is connected to one side, away from the sample 7, of the cushion block, and the other end of the dowel bar is connected to the lower surface of the weight plate 2; the weight 1 is arranged on the upper surface of the weight tray 2; the side limiter 5 is arranged on the side surface of the dowel bar 4 and used for reducing the lateral deformation of the dowel bar 4; the dowel bar 4 transmits the load of the weight 1 into the test sample 7, and the displacement sensor 3 is used for measuring the displacement of the test sample 7 after the load is applied;

the CT scanner conducts nondestructive observation on the rheological process of the sample through the transparent toughened glass, and the internal structure of the sample is visually given under the condition that the original shape of the sample is not damaged.

The specific use method comprises the following steps:

1) selecting a flat field to erect CT scanning equipment, and specifically comprising an X-ray generator 9, a ray detector 10 and a computer system 11;

2) a toughened glass sample sleeve with scales at the lower part is stably placed so as to be convenient for observing the size of a sample during sample loading;

3) adding a test sample (the size of the test sample is 35mm × 70mm) into the lower transparent device according to the geotechnical test specification;

4) placing a cushion block on the sample to limit the sample in a fixed volume and ensure that the upper load is uniformly transmitted into the sample;

5) a toughened glass vessel is arranged to protect the sample, so that the subsequent CT scanning is facilitated;

6) a rheological instrument (comprising a weight tray, a dowel bar and brackets at two sides) is erected on the transparent device, and a device for controlling the deformation of the side edge is arranged on the dowel bar;

6) installing a displacement sensor, and monitoring the change condition of deformation in real time by connecting with a computer;

7) setting and starting the CT scanning equipment according to the requirement, and starting computer software;

8) weights with certain mass are placed on the weight tray;

9) and analyzing and processing the obtained data by computer software to further judge the deformation and internal structure change conditions of the rock-soil body in the rheological stage.

The above description is only an exemplary embodiment of the present invention, and the scope of the present invention should not be limited accordingly. The equivalent changes and modifications made according to the patent scope and the content of the specification of the present invention should still fall within the scope covered by the present invention.

Claims (1)

1. A portable earth work rheometer for CT scanning, comprising: the weight, the weight tray, the displacement sensor, the dowel bar, the side limiter, the cushion block and the transparent toughened glass;

the transparent toughened glass surrounds to form a cavity with an upward opening, and a sample is filled in the cavity; the cushion block enters the cavity through the opening and is extruded with the sample;

one end of the dowel bar is connected to one side, far away from the sample, of the cushion block, and the other end of the dowel bar is connected to the lower surface of the weight tray; weights are arranged on the upper surface of the weight tray; the side limiter is arranged on the side surface of the dowel bar and used for reducing the lateral deformation of the dowel bar; the dowel bar transmits the load of the weight to the sample, and the displacement sensor is used for measuring the displacement of the sample after the load is applied to the sample;

the CT scanner conducts nondestructive observation on the rheological process of the sample through the transparent toughened glass, and the internal structure of the sample is visually given under the condition that the original shape of the sample is not damaged.

Images