Soil anchor rod drawing test method considering changing confining pressure conditions

Abstract

The present invention discloses a soil anchor rod drawing test method considering changing confining pressure conditions. The method comprises: installing a lower gasket and a supporting base; installing a valve at an outer wall of the supporting base; installing a sample base, a test sample, and a sample cap and ensuring sealing performance; installing a reaction force frame and a reaction forceframe upper cover on outside of the test sample and the sample cap; injecting water and pressurizing an environmental pressure chamber of the sample to simulate stress state of the soil; adjusting height of the reaction force beam and connecting and clamping an anchor rod; dynamic loading shock loads borne by a simulated anchor, and recording experimental data; and disassembling an anchor rod drawing test device. The method applies confining pressure around the test sample to effectively simulate the actual stress state of the soil body, at the same time, has a dynamic loading device system atthe reaction force beam, can realize dynamic drawing of the anchor rod, and more truly reflects the stress and deformation of the anchor rod in an actual project. The method improves precision of anexperimental test and makes test results more scientific and accurate

Description

technical field [0001] The invention belongs to the technical field of rock and soil anchoring engineering, and in particular relates to a soil anchor pullout test method considering changing confining pressure conditions. Background technique [0002] With the vigorous development of many engineering constructions in our country, geotechnical anchoring technology has played an important role in it. Bolt support is an important part of geotechnical anchoring technology. Because of its economical, effective, safe and reliable reinforcement characteristics, it has been widely used in engineering construction and has great development prospects. The anchoring technology relies on the tight bonding between the rod body and the surrounding rock and soil to improve the strength and stability of the soil. If it can be effectively anchored in the soil layer, it depends on the resistance of the anchor rod to be pulled out. After research, it is found that the force and deformation o...

AI Technical Summary

Problems solved by technology

[0004] If the in-situ test is used to analyze and test the dynamic anchoring performance of the anchor when the stress state of the soil and the strength and size of the anchor are changed, there are problems such as high cost, long construction period, and multi-working condition analysis cannot be carried out. The evaluation of performance is not systematic and objective enough

Carrying out model tests in the trenches and model boxes has defects such as large model size, poor repeatability, and inability to guarantee soils with different stress states.

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