Method for acquiring proportion of composite grouting material for reinforcing fractured rock mass

Abstract

The invention provides a method for acquiring the proportion of a composite grouting material for reinforcing fractured rock mass. The method comprises the following steps of compounding a chemical material with polyurethane according to different mass proportions, mastering a mechanical property change rule after each proportion of the chemical material is compounded with polyurethane, selecting a plurality of proper chemical materials and compounding the chemical materials with polyurethane together, researching and developing a plurality of groups of composite grouting materials with different proportions, acquiring mechanical parameter values of the composite grouting materials, adopting the composite grouting materials to carry out grouting reinforcement tests on fractured rock masses, observing the reinforcement effect, selecting a group of composite grouting materials with the best reinforcement effect, and determining the proportion of all the components of the selected group of composite grouting materials as the optimal proportion of the novel composite grouting material. According to the method for acquiring the proportion of the composite grouting material for reinforcing fractured rock mass, the optimal proportion of all the components of the chemical composite grouting material can be obtained, so that the composite grouting material with excellent performance is prepared, and the fractured rock mass is effectively reinforced.

Description

technical field [0001] The invention relates to the field of composite grouting materials for cracked rock mass reinforcement, in particular to a method for obtaining the ratio of composite grouting materials for cracked rock mass reinforcement. Background technique [0002] The degree of crack development has a significant impact on the stability, physical and mechanical properties, and stress transfer of engineering rock mass. The penetration and development of cracks can easily induce geological disasters such as rock collapse and landslides, resulting in loss of life and property and damage to infrastructure. It affects the construction progress and safety of rock mass engineering, making it necessary to reinforce this type of rock mass. [0003] Traditional reinforcement methods such as anti-slide piles, anchor rods, and retaining walls tend to be mature. These methods mainly use physical and mechanical means to reinforce the rock mass as a whole. They have the disadvan...

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Problems solved by technology

[0003] Traditional reinforcement methods such as anti-slide piles, anchor rods, and retaining walls tend to be mature. These methods mainly use physical and mechanical means to reinforce the rock mass as a whole. They have the disadvantages of long construction period and high cost, and due to the harsh geological environment, the construction is difficult. Engineering accidents may occur during the construction process, resulting in casualties

In addition, at present, cement grouting materials are mostly used for grouting reinforcement of rock mass fissures, but the material has a long consolidation time, poor corrosion resistance, and is prone to engineering problems such as air bubbles and cracks, which affect the reinforcement effect. Practical significance

[0004] At this stage, polyurethane grouting materials are widely used in foundation reinforcement, leak plugging and water sealing, curtain anti-seepage and crack repair, etc. It has the advantages of good impermeability, good corrosion resistance, short setting period and adjustable setting time. A kind of chemical grouting material with excellent performance, but its mechanical properties such as consolidation strength and elastic modulus are not good, and the heat of reaction is more, so its modification becomes important, and the modified polyurethane composite grouting material can be better Good reinforcement of fractured rock mass, improving the reinforcement effect

[0005] However, the current existing technology is mainly to compound a single chemical material with polyurethane, such as using water glass and polyurethane to achieve the reinforcement effect, but in reality, the environment of the fractured rock mass is complex, and the grouting materials often need to meet various requirements to play a role. Good reinforcement effect. For example, grouting materials must meet the requirements of enhancing impermeability, increasing compressive strength, and increasing shear strength at the same time. The mechanical parameter values ​​​​of a single chemical material composite cannot meet the requirements, and the reinforcement effect is poor.

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