Test method and system for simulating bonding property between rock-soil and anchor under formation pressure

Abstract

The invention discloses a test method and system for simulating bonding property between undisturbed rock-soil and an anchor under formation pressure. The test system comprises: a measuring device, asample fixing device, a formation pressure simulating device, and a pressure grouting device. Pressure bladders are mounted on the side surface and the top surface of a sample, respectively. A radialdeformation gauge is mounted on the outside of the sample. One ends of a grouting plug and a stopping plug are topless conical shapes. An exhaust valve is provided on the bottom of a support beam. Thetest system can perform pressure grouting on the sample and monitor the radial deformation. The dual pressure bladder can apply pressure to the lateral and vertical directions of the sample to simulate formation pressure. The silicone gasket and the perforated steel sheet are placed on the upper surface and below surface of the sample to eliminate the end friction effect. The rock/soil was compressed and restored to the initial formation pressure to limit the vertical deformation of the sample. The stress state, the stress path, and the preparation process of the sample are consistent with the actual situation of the anchor, which is suitable for the test of the bonding property between the rock-soil and the anchor under various working conditions.

Description

technical field [0001] The invention relates to a bolt testing technology often used in engineering such as slopes, foundation pits, tunnels, mines, and traffic, and in particular to a testing system and testing method for the bonding performance of undisturbed rock-soil bodies and anchoring bodies under the action of simulated formation pressure. Background technique [0002] Bolt support technology is widely used in geotechnical engineering such as slopes, foundation pits, tunnels, mines, etc. due to its advantages of convenient construction and low cost. In engineering, the bearing capacity of the bolt is mostly evaluated according to the results of the field test. Although the field test can reflect the actual bearing characteristics of the bolt, it has high cost, long test cycle time, affects the construction period, and cannot simulate various working conditions (such as heavy rain Working conditions, dry and wet cycle conditions, etc.) and other shortcomings. [0003...

AI Technical Summary

Problems solved by technology

A cylindrical loading air bag is set on the outside of the sample, which can pressurize the side of the sample, but not the end of the sample, so that the undisturbed rock and soil cannot be compressed and restored to the initial formation stress state; in addition, the sample The two ends of the sample are in direct contact with the upper and lower cover plates, resulting in a friction effect at both ends of the sample, which in turn makes the radial deformation of the sample uneven

[0006] The Chinese invention patent "A Rock Side Friction Test Device and Method with Controllable Confining Pressure (Publication No.: CN105547841 A, Application Publication Date 2016.05.04)" discloses a rock side friction tester usin...

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