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Silica sol slow seepage reinforcement method for argillaceous soft rock

A silica sol and soft rock technology, which is used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve problems such as large deformation support, improve the compactness, increase the deformation resistance and durability of rock mass, and reduce penetration. sexual effect

Active Publication Date: 2017-10-27
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 seepage reinforcement method for 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

Provided is a silica sol slow infiltration reinforcing method for argillaceous soft rock, comprising the following steps: a. lithological changes, pore development characteristics and hydrogeological conditions of roadway surrounding rock are evaluated, and grouting hole (1) parameters and silica sol ratio are determined; b. grouting holes (1) are constructed before argillization, grouting pipes (2) are mounted and the holes are sealed, and silica sol is injected, and in the same time period the silica sol quickly fills and reinforces macrofissures under the drive of a grouting pressure; and c. when the grouting pressure is reduced to a certain value, and the low pressure is maintained for a long time, and in the same time period the silica sol slowly diffuses and enters microfissures of the rock mass under the drive of a capillary force to form a highly-compact reinforced mass, such that the reinforcing of the surrounding rock is complete. The method not only has the macrofissures filled, but also enables microchannels of water molecules and air molecules in a mud rock matrix to be closed, substantially hinders microcosmic effects such as adsorption, dissolution and weathering, improves the compactness and integrity of microstructures of the mud rock, reduces the permeability, and improves the deformation resistance and durability of the rock mass.

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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Patent Type & Authority Patents(China)
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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