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Method capable of repeated grouting and reinforcing surrounding rocks of roadway

A technology of repeated grouting and roadway, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as surrounding rock rupture, roadway instability, and strength decline, and achieve easy maintenance of grouting pressure, improved effect, and filling full more even effect

Inactive Publication Date: 2013-05-08
HENAN POLYTECHNIC UNIV
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Problems solved by technology

However, once the deformation of the roadway exceeds a certain limit, the supporting force required to maintain the stability of the roadway will increase, but it is impossible to grasp the timing so that the most economical support can completely counteract the stress of the surrounding rock at a certain limit. Causes the cracking of the surrounding rock, the decrease of strength, and the instability of the roadway

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  • Method capable of repeated grouting and reinforcing surrounding rocks of roadway
  • Method capable of repeated grouting and reinforcing surrounding rocks of roadway
  • Method capable of repeated grouting and reinforcing surrounding rocks of roadway

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Embodiment Construction

[0029] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the invention.

[0030] figure 1 It shows the implementation flow of the method for repeatable grouting to reinforce the roadway surrounding rock provided by the embodiment of the present invention.

[0031] The method includes the following steps:

[0032] Step S101, according to the possible displacement of the roadway when the roadway reaches stability under the grouting condition, determine the gross section size of the roadway, and select the grouting material;

[0033] Step S102, according to the in-situ stress environment of the roadway and the bearing capacity of the solidified surrounding rock mass, comprehens...

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Abstract

The invention discloses a method capable of repeated grouting and reinforcing surrounding rocks of roadway. The method includes the following steps: 1, confirming gross section size and selecting grouting materials according to displacement probably generated when a roadway reaches to stabilization on the condition of grouting, 2, confirming the depth and the array pitch of a grouting hole, seriflux ratio and grouting parameters, 3, adopting an air drill or a jumbolter to drill grouting holes on the periphery of the roadway, inserting a grouting pipe, and blocking gaps between an outer end of a blocking pipe and hole walls, 4, grouting in a sequence from a low-position hole to a high-position hole, 5, grouting in a separated-row and jumping mode to raise grouting effect, 6, when the displacement of the roadway increases to the fact that an obvious gap occurs, or acceleration or unstable deformation occur to thee roadway, conducting a new round of grouting. The method has the advantages that the roadway releasing energy through orderly deformation, thus needed supporting pressure is reduced gradually. Besides, broken surrounding rocks caused by constriction of the roadway are glued together timely though repeated grouting, thus a supporting structural body with good integrity and high strength always exists around the periphery of the roadway, and ultimately, the needed supporting force for maintaining stabilization of the roadway is reached or exceeded.

Description

technical field [0001] The invention belongs to the technical field of roadway surrounding rock reinforcement, in particular to a method for repeatedly grouting reinforcement of roadway surrounding rock. Background technique [0002] For roadways located in coal or rock mass or coal and rock mass, the surrounding rock stress is redistributed during excavation, and displacement occurs at the same time. As the displacement continues to increase, the roadway will produce instability and damage. For the stability of the roadway, it is necessary to support the roadway. The supporting force required for the stability of the roadway has a certain relationship with the displacement of the surrounding rock of the roadway. The greater the displacement and deformation of the surrounding rock of the roadway, the smaller the supporting force required to maintain the stability of the roadway. Once the surrounding rock deformation exceeds a certain limit, the supporting force required to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
Inventor 邹正盛郑清洁琚晓冬李庆波高卫亮
Owner HENAN POLYTECHNIC UNIV
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