Roadway surrounding rock supporting method capable of applying pre-tightening force in graded mode

Abstract

The invention discloses a roadway surrounding rock supporting method capable of applying pre-tightening force in a graded mode. The method comprises the following steps that a hole is drilled, and a rock body is divided into a first section, a second section, a third section and a fourth section according to the breaking condition of the rock body in the hole; and the first section, the second section, the third section and the fourth section are anchored in sequence. According to the roadway surrounding rock supporting method capable of applying the pre-tightening force in the graded mode, the rock body is divided into the four sections according to the space difference of the rock body, different supporting structures and supporting modes are adopted for the different sections, and therefore differentiated supporting of the rock body with the space difference is achieved; and according to the method, a supporting structure combining anchor rod supporting and anchor cable supporting is adopted, a mode of combining anchoring agent anchoring and grouting anchoring is adopted, the method can be more suitable for the construction environment of deep high-stress roadways, the method isfirmer than a common single anchor rod or anchor cable anchoring supporting mode and a single anchoring agent anchoring or grouting anchoring mode, and the anchoring effect is more obvious.

Description

【Technical field】 [0001] The invention relates to the technical field of roadway surrounding rock reinforcement, in particular to a roadway surrounding rock support method that can apply pretightening force in stages. 【Background technique】 [0002] In the process of coal mining, due to the complexity and variability of surrounding rock conditions, support structures such as bolts and anchor cables play an important role in the support of roadway surrounding rocks, ensuring the safety of resource mining and machinery and personnel. The survey found that at present, the most important support method in the control of surrounding rock in deep roadways at home and abroad is still the support method of anchor rods and anchor cables combined with shotcrete support. The prestressed anchor rod can give strong supporting force to the shallow broken rock mass and maintain the stability of the roadway structure; the prestressed anchor cable has good advantages in terms of structural l...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a roadway surrounding rock support method that can apply pre-tightening force in stages, and solve the problem that the support method of local anchorage and local grouting in the prior art cannot be spatially differentiated according to the mechanical structure of the roadway surrounding rock at different depths. The problem of poor support effect caused by support

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