Shear anchor structure and its construction method

Abstract

The invention discloses a shear-stress-reduction anchoring structure. The shear-stress-reduction anchoring structure comprises a free section drill hole. The inner bottom surface of the free section drill hole is provided with an anchoring section drill hole. The free section drill hole extends inwards to the inner side of a potential slip plane of a slope. An anchor bar is arranged in the free section drill hole and the anchoring section drill hole. The outer end of the anchor bar extends out of the free section drill hole. The anchoring section drill hole is filled with mortar wrapped outside the anchor bar. The free section drill hole is filled with a low-compression-modulus grouting material wrapped outside the anchor bar. An anchorage device which is arranged on the anchor bar in a sleeving mode and used for tensioning and fixing the anchor bar is arranged at an orifice on the outer side of the free section drill hole. The invention further discloses a construction method of the shear-stress-reduction anchoring structure. According to the shear-stress-reduction anchoring structure and the construction method thereof, the technical purpose of stabilizing the slope is achieved by means of the shearing strength between layers of rock stratums.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering slope reinforcement, in particular to a shear-type anchorage structure and a construction method thereof. Background technique [0002] A bedding rock slope refers to a rock slope in which the inclination of the rock layer is consistent or basically consistent with the orientation of the slope surface, and it is a common and easily unstable rock slope type. When performing slope cutting and excavation on bedding rock slopes, because the rock layer is usually a weak surface, if the inclination angle of the rock layer and the slope angle of the slope meet certain conditions, the slope rock mass is easy to collapse under the action of gravity. Integral or local instability and failure along the rock formation may cause losses or disasters. [0003] In order to avoid the instability and failure of bedding rock slope, it is very necessary to take reasonable support and reinforcement m...

AI Technical Summary

Problems solved by technology

[0005] This method of pre-reinforcement of the anchorage structure that does not allow deformation of the slope rock mass may have two problems: one is that the actually designed anchorage structure is too conservative

The exertion of the shear strength of the rock layer is beneficial to the stability of the slope, but the exertion of the shear strength requires the relative displacement trend or even relative displacement of the rock mass on both sides of the rock layer. Deformation without considering the shear strength of the rock layer will inevitably lead to the actual design of the anchorage structure is too conservative

Second, there is a risk that the anchoring structure will lose its anchoring capacity due to shear damage

When the slope deforms along the direction of the slope, the preset anchorage structure will inevitably undergo shear deformation. Because the shear resistance of the anchorage structure is very low and the allowable shear deformation is very small, the anchorage structure is prone to shear deformation or The shear stress is too large and damaged, thus losing the anchoring ability

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