Device and method for making sample blanks for friction performance test of anchor or pile and soil interface

Abstract

The invention discloses a sample blank manufacturing device and method for an anchor or pile and soil interface friction performance test. The device comprises a sample barrel, a cushion barrel, a sample barrel fixing component, a compaction hammer, a core pipe component and a limiting device. According to the sample blank manufacturing device and method for the anchor or pile and soil interface friction performance test, any required soil indicator can be designed according to the test, or a sample blank can be manufactured according to actual soil indicators of a field soil body, so that batched indoor anchor-soil or pile-soil interface friction performance tests are realized. Meanwhile, because a relatively short cementing section is adopted in a sample, the actual friction performance of an anchor-soil or pile-soil interface can be relatively really reflected.

Description

technical field [0001] The present invention relates to the anchor rod or pile foundation test technology often used in housing construction, highway, railway, municipal, mine and other projects, in particular to a sample preparation device and method for friction performance test of anchor or pile and soil interface . Background technique [0002] Anchor and pile foundation technology is widely used in housing construction, highway, railway, municipal, mining and other engineering fields, and its bearing capacity test is usually carried out outdoors in situ. In recent years, some colleges and research institutes have used indoor model tests to test the interface friction performance of anchors or piles and soil, but they are all tested in trenches or model boxes. The test methods and methods are similar to those of outdoor in-situ tests. Similarly, they all have defects such as time-consuming, laborious, and poor repeatability, just like in-situ tests. For this reason, at...

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Problems solved by technology

[0004] ① Due to the relatively large size of the model, the test system and the sample cannot be used separately, so the repeatability is poor, and the interface friction performance test of anchors or piles and soil under different working conditions or combined working conditions cannot be carried out in large quantities;

[0005] ②Lack of a sealed water retention device, it is difficult to ensure the constant water content of the soil during the test. If it is used to test the long-term friction performance or creep characteristics of the anchor-soil interface or pile-soil interface with different water contents, the test results will inevitably be unavoidable. No distortion;

[0006] ③When theoretically analyzing the load transfer law of anchor rods or piles, the friction properties of the anchor-soil interface or pile-soil interface on the micro-segment are used (such as the shear stress and displacement of the interface or the shear stress and shear strain relationship), so when testing this interface friction performance, the length of the anchor-soil bonded section or the pile-soil bonded section in the sample should be as small as possible, while in the existing model test devices and methods, the anchor-soil bonded section The length of the soil or pile-soil bonded section is very long, so the average interface friction performance on this long section is obtained, which cannot truly reflect the friction performance of the anchor-soil or pile-soil interface

However, there is no device and method for making specimens (i.e. sample blanks and anchors or piles) that can meet the above requirements and are specially used for anchor-soil or pile-soil interface friction performance tests.

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