Model test device and test method for water-rich fractured rock stratum flowing water grouting reinforcement

Abstract

The technical problem to be solved by the invention is to provide a test device and a test method for a flowing water grouting reinforcement model of a water-rich fractured rock stratum. The test device comprises a grouting model system, an underground flowing water supply system, a grouting system, a ground stress loading simulation system, a monitoring system and a standard test piece processing system, a top plate of the grouting model system is provided with a water filling nozzle, and the upper end and the lower end of the side wall are respectively provided with a grouting hole and a grout outlet; the underground dynamic water supply system is communicated with the water injection port through a water injection pipe, and the water pressure and the water speed are adjusted in a combined adjusting mode; the grouting system is communicated with the grouting opening through a grouting pipe, and the grouting pressure and the flow speed are adjusted through the power system; the ground stress loading simulation system is used for carrying out stress loading on the top plate of the device; the monitoring system monitors grouting and stratum parameters; and the standard test piece processing system is used for preparing a reinforcing body standard test piece. The device can effectively simulate grouting reinforcement of broken surrounding rocks under complex flowing water and ground stress conditions, and can effectively research the reinforcement effect.

Description

technical field [0001] The invention relates to the field of water-rich broken surrounding rock / rock mass dynamic water grouting reinforcement for tunnels and underground engineering, in particular to a model test device and test method for water-rich broken rock stratum dynamic water grouting reinforcement. Background technique [0002] In the construction of underground engineering, water-rich and broken surrounding rock is a common unfavorable geological situation. Due to the weak bearing capacity of water-rich broken rock mass, the broken rock mass itself is a good channel for groundwater, with a large amount of water inrush and poor impermeability. Water gushing caused instability, resulting in frequent accidents such as caving of loose objects and large-scale landslides. At present, the grouting reinforcement method is often used to improve the mechanical properties of the broken rock mass to meet the engineering requirements. The grouting reinforcement method is to i...

AI Technical Summary

Problems solved by technology

At present, the technical problems of dynamic water grouting reinforcement for water-rich broken rock mass are as follows: (1) The grouting position is highly concealed, the water area survey is difficult, and the construction risk is high

(2) The groundwater space is recharged on a large scale. Once the phenomenon of water and mud inrush occurs, it is difficult to stop by itself, and the harm is huge.

(3) Under the comprehensive action of tunnel excavation and long-term osmotic pressure, the rock mass instability and failure mechanism in the water-rich fractured zone is complex, and it is difficult to early warning and prevention of catastrophe

(4) High risk, water-rich broken rock mass has been under the action of groundwater seepage and groundwater ion erosion for a long time, the property of rock mass has deteriorated seriously, and the risk of catastrophe is higher under the action of construction disturbance

In the model test for the technical problem of dynamic water grouting reinforcement of water-rich broken rock mass, there are also difficulties in accurately simulating water-rich, in-situ stress, and grouting states at the same time

At the same time, research on grouting reinforcement at home and abroad mostly focuses on water-rich fractured rock mass and sandy soil layers. There are still some problems in the grouting reinforcement model tests and test methods for water-rich fractured surrounding rocks, which are ubiquitous and difficult. many deficiencies

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