Three-dimensional slip-casting model test servo control system and testing method

Abstract

The invention discloses a three-dimensional slip-casting model test servo control system and a testing method. Based on a mechanical loading method, a disturbed rock soil body is re-molded, and the injected rock soil body which is analogous with the undisturbed soil is formed; an axial and circumferential flexible loading method is employed, and the injected rock soil body is in a three-dimensional stress state, so that the stress environment of the soil body can be simulated in a real mode; a high pressure oil-chamber sealing technology is employed, and a testing chamber can bear high slurrypressure, so that the slip-casting pressure can be simulated in the real mode; a mechanical method is employed for fixing a drilling tool, the drilling smoothness is increased, a sample is effectivelyprotected from being disturbed or less disturbance, and the slip-casting solid sampling quantity is increased.

Description

technical field [0001] The invention relates to a three-dimensional grouting model test servo control system and a test method. Background technique [0002] In the construction of underground projects such as tunnels and subways, unfavorable geological bodies such as water-rich fault fracture zones and karst caves are often encountered, which in turn induces sudden water gushing, landslides and other disasters, seriously threatening the safety of the project. Grouting is an effective method to control water inrush disasters in underground engineering, strengthen and improve the bearing capacity of strata, and ensure engineering safety. [0003] The grouting model test is one of the important means to study the mechanism of grouting water plugging reinforcement. At present, there are many problems in the existing grouting model test system, including: (1) Most of the rock and soil in situ are restored by manual compaction of loose soil, and the compaction standard is not st...

AI Technical Summary

Problems solved by technology

At present, there are many problems in the existing grouting model test system, including: (1) Most of the rock and soil in situ are restored by manual compaction of loose soil, and the compaction standard is not standardized, which cannot effectively simulate the natural state of the rock and soil (2) One-way loading method is often used to simulate the vertical stress of soil, without considering the influence of horizontal ground stress on the grouting effect; (3) The sealing performance of the connection parts of the model frame is poor, and the pressure of the test chamber is low , the test grouting pressure cannot truly simulate the actual grouting pressure in the project; (4) When manual sampling is performed for physical and mechanical parameter testing, the vibration of the drilling tool and the eccentric shaking are relatively large, the sampling disturbance is serious, and the grouting reinforcement is destroyed at the same time. Distortion of measured physical and mechanical parameters

The above shortcomings of the traditional grouting model test system lead to poor accuracy of test results and limited applicability of the test system

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