Multi-directional composite hole nailing and injecting reinforcement method suitable for tuff roadway

Abstract

The invention relates to a multidirectional composite hole nailing and grouting reinforcement method suitable for a tuff roadway. A nailing and grouting body rock body framework, a composite grouting technology and a composite grouting material are included. According to the nail injection body rock mass framework, nail injection holes are formed in the two sides within a roadway excavation contour line in a crossed mode, an upper row, a middle row and a lower row of nail injection holes are formed in the mode that the radial direction and the oblique direction are combined from a roadway arch camber line to the lower portion, each row of nail injection holes are divided into two-stage holes in a staggered mode, and overall grouting reinforcement supporting is conducted; according to the composite grouting technology, in the grouting stage and the grouting pressure, a sequencing mutual checking progressive mode is adopted for composite encryption grouting, hollow rivets are adopted as nail grouting holes for sealing orifices, and a high-pressure grouting device composed of a high-pressure orifice valve, a high-pressure grouting pipe, a grouting pump, a slurry suction pipe and a double-layer stirring barrel is used for grouting. Different grouting pressures are adopted in different grouting stages; the first-stage hole cement slurry of the composite grouting material reinforces large cracks, the second-stage hole chemical slurry fills and densifies small cracks, and the composite grouting material has the advantages that the anti-sliding supporting effect is greatly improved, and the potential safety hazard of local instability of the tuff roadway is thoroughly eliminated.

Description

technical field [0001] The invention relates to a support method for a soft rock roadway in the technical field of underground mine safety, in particular to a multi-directional composite hole nail injection reinforcement method suitable for a tuff roadway. Background technique [0002] Tuff is formed by the cementation and compaction of fine volcanic substances by volcanic ash hydrolysis substances or clay substances, with fine particles and loose structure. The tuff formation is mostly thin-bedded, with poor integrity, easy to weather, water-absorbing and swelling, and the physical and mechanical properties of the rock mass are low. Affected by factors such as ground stress, structural stress, and blasting vibration, underground roadways are prone to deformation, support body falling off, edge There are different degrees of continuous damage such as gang collapse, and even some regional roadways are still damaged after repair. [0003] The existing treatment methods in the...

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Problems solved by technology

[0003] The existing treatment methods in the industry: one is to adopt the replacement reinforcement support method, which is more effective for the floor of the roadway, but there are problems such as difficulty in construction of the two sides of the roadway and great safety hazards; Solve the problem of low physical and mechanical properties of the rock mass, and deformation still occurs under the influence of factors such as ground stress, structural stress, and blasting vibration; the third is the prestressed anchor cable support. The stress is applied to the design value, and the integrity of the rock mass is poor, it is easy to deform, and it is difficult to transmit the sliding force to the stable surrounding rock body through the anchor cable. The diffusion of cement slurry is limited, and it is difficult to achieve the effect of grouting, etc.

[0004] In order to solve the above-mentioned problems, patent CN201010268147.0 has been disclosed successively, "Using over-excavation and filling soil replacement method to control the bottom drum of tuff roadway", but it cannot control the damage of the two sides of the roadway; patent CN201110431968.6 discloses "Using wire rope anchor However, it cannot solve the problem of low physical and mechanical properties of rock mass, and deformation still occurs under the influence of factors such as ground stress, tectonic stress and blasting vibration.

[0005] To sum up, domestic and foreign colleagues have conducted a lot of research on the support method of soft rock roadway, especially a multi-directional composite hole nail reinforcement method for tuff roadway, but no effective method and measure have been found so far.

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