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Silica sol slow infiltration reinforcing method of argillaceous soft rock

A technology of silica sol and soft rock, applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve problems such as large deformation support, improve compactness, increase rock mass anti-deformation ability and durability, and reduce seepage sexual effect

Active Publication Date: 2015-12-30
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] Technical problem: The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for strengthening the argillaceous soft rock with silica sol slow seepage; this method performs high-density grouting on the argillaceous soft rock to alleviate the safety hazards caused by micro-pores , to solve the large deformation support problem of softening rheology

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  • Silica sol slow infiltration reinforcing method of argillaceous soft rock

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Embodiment 1

[0019] Embodiment 1: the silica sol slow seepage reinforcement method of argillaceous soft rock of the present invention, concrete steps are as follows:

[0020] A roadway with a rectangular section, width × height = 4.6 × 3.6m, the roof is siltstone, rich in fissure water; the sides and floor are mudstone, and when it is cemented, micropores develop. In order to control the large deformation of the roadway, silica sol is used for grouting, and silica sol A material: B material = 4:1.

[0021] Construct grouting hole 1 on the side and floor before mudification, with a depth of 2m and a row spacing of 1.5m; install grouting pipe 2 and seal the hole, and inject silica sol; when the grouting pressure reaches 1.5MPa, stabilize the pressure for 5min Finally, reduce the grouting pressure, during which, driven by the grouting pressure, the silica sol quickly fills and strengthens the macroscopic cracks;

[0022] When the grouting pressure drops to 0.5MPa, the grouting is stopped aft...

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Abstract

The invention discloses a silica sol slow infiltration reinforcing method of argillaceous soft rock, which belongs to the silica sol slow infiltration reinforcing method of the argillaceous soft rock. The silica sol slow infiltration reinforcing method is realized by the following steps of a, evaluating lithological changes, pore development characteristics and hydrogeological conditions of roadway surrounding rock, and determining grouting hole parameters and silica sol mixture ratio; b, constructing grouting holes before argillization; mounting a grouting pipe and sealing the holes, and injecting silica sol; during operation, quickly filling and reinforcing macrofractures with the silica sol under the drive of grouting pressure; c, when the grouting pressure is reduced to a certain value, maintaining low pressure for a long time; during operation, enabling the silica sol to slowly diffuse and enter into microfissures of a rock mass under the drive of a capillary force to form a high-compactness reinforcing body, and finishing the reinforcing of the surrounding rock. According to the silica sol slow infiltration reinforcing method disclosed by the invention, the macrofractures are filled, water microchannels of molecules and air molecules in a mud rock matrix are closed, microcosmic effects such as adsorbing, dissolving and weathering are obviously hindered, the compactness and the integrity of a microstructure of mud rock are greatly improved, and further the permeability is reduced, and eventually the deformation resistance and the durability of the rock mass are improved.

Description

technical field [0001] The invention relates to a silica sol slow seepage reinforcement method for argillaceous soft rock, which is suitable for underground support projects such as mudstone roadways and chambers in coal mines. Background technique [0002] The argillaceous soft rock is mainly composed of clay minerals, with small pores, extremely weak water permeability, high capillary rise, low strength, easy weathering, and a water softening coefficient as high as 0.10-0.50, which is extremely sensitive to mining and excavation disturbances . This series of physical and mechanical properties makes the argillaceous soft rock exhibit typical soft rock characteristics under low stress conditions, making the excavation and maintenance of coal mine roadways extremely difficult. Under the coupling effect of surrounding rock pressure and fissure water, pressure is applied all around, often before excavation and repair, which greatly reduces the speed of normal roadway formation...

Claims

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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 张农潘东江谢正正
Owner CHINA UNIV OF MINING & TECH
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