Anchor rod and anchoring method used for soft rock deformation in deep roadway

Abstract

The invention provides an anchor rod and an anchoring method used for soft rock deformation in a deep roadway. The anchor rod comprises a first anchor rod, a hollow anchor rod, an anchor rope and a second anchor rod; the rear end of the first anchor rod is connected with the front end of the second anchor rod through the hollow anchor rod, and the hollow anchor rod is internally provided with the anchor rope; the two ends of the anchor rope are correspondingly connected with the rear end of the first anchor rod and the front end of the second anchor rod; a barrier plate is mounted on the first anchor rod and is positioned at the rear end of the first anchor rod; the second anchor rod is sleeved with a barrier plate, and the barrier plate is positioned at the front end of the second anchor rod. The anchor rod is simple in structure, convenient to operate and low in cost; during being anchored, the first anchor rod is anchored by adopting an anchoring cartridge, the second anchor rod is bond by adopting a grouting method, a deformation space of an extendable member is fully reserved in the hollow anchor rod, the bearing capacity of stress redistribution of surrounding rock can be automatically controlled, the hollow anchor rod is deformed when the surrounding rock is deformed, the anchor rope can bear the huge resistance, and prevention and control over roadway deformation are realized.

Description

technical field [0001] The invention relates to an anchoring device and an anchoring method for preventing soft plastic surrounding rocks in deep roadways, in particular to an anchor rod and an anchoring method for soft rock deformation in deep roadways. Background technique [0002] At present, as the mining project is gradually carried out to the deep part, the research work on the research topics and projects related to the surrounding rock support of deep roadways needs to consider the influence of deformation more. The existing deep roadway surrounding rock support is ordinary bolt support, the applicable deformation is not very large, and the large deformation in the case of soft rock is ignored, so there are certain limitations. [0003] At present, the support of ordinary bolts for surrounding rocks in deep roadways has a good supporting effect on hard rock, but the supporting effect on deep soft rocks is not very obvious. A large number of measured data show that th...

AI Technical Summary

Problems solved by technology

According to the working principle, the extensible bolt can be classified into two categories: the extensible rod body and the sliding and extensible structural element. In order to realize the elongation of the anchor rod, the end anchoring method is usually used, that is, the anchor head is consolidated with the rock mass at the bottom of the hole. The anchor bolt tail is preloaded with a pallet, which is different from the continuous deformation of the weak surrounding rock and the relative integrity of the surrounding rock. The deformation gradually increases with time. For the anchor bolt of traditional support, the deformation cannot reach that of soft rock. The amount of deformation causes the bolt to break, thereby destroying the surrounding rock and inducing the occurrence of roof collapse and side walls in the roadway

[0004] In dealing with the large deformation of soft rock, an extensible anchor rod that resists large deformation is proposed. For example, the Chinese patent application number 201110430379.6 discloses a reserved anchoring method for rockburst prevention. Although the rod body is provided with a part of the extensible section, But only applicable to hard and brittle rock mass

The Chinese patent with the application number 201020602613.X discloses a ductile anchor rod, which is provided with a wave segment and a rigid spring, but the deformation resistance effect of the wave segment anchor rod is not obvious

The Chinese patent application No. 201020684957.X discloses a water-swellable elastic anti-rockburst bolt, the deformation length is about 9% of the effective anchorage length, but the bolt bearing capacity is low, but it is not suitable for high ground stress condition

The Chinese patent with the application number 201010552103.0 discloses a reserved anchoring method for hard rock deformation and can provide elongation. This method uses two resin anchors, fast bonding and slow bonding, to achieve reserved anchoring. However, if the operation is not done properly, the extensible member will be easily bonded when the anchor rod is drilled, and the effect of the anchor rod on compressive deformation is not good.

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