Active anti-shear concrete supporting structure for reinforcing deep sliding surfaces of rock slopes

Abstract

The invention discloses an active anti-shear concrete supporting structure for reinforcing deep sliding surfaces of rock slopes, mainly comprising anchor caverns and prestressed anchor cables penetrating through the anchor caverns and into stable rocks. The anchor caverns comprise axial main bearing bars (including reinforced bars and joist steel), backfill concrete, contact grout and consolidation grout around the caverns, an anchor cavern end expansion head of a sliding surface hanging wall and the like. The inner anchoring sections of the prestressed anchor cables are positioned in the stable rocks in a sliding surface footwall. Outer anchor heads are positioned at the anchor cavern ends of the sliding surface hanging wall and dynamometers are installed on the outer anchor heads. The structure is characterized by changing passive supporting to active supporting and transferring the slope sliding force to the stable rocks of the sliding surface footwall by the prestressed anchor cables; and ensuring the anchor caverns, the prestressed anchor cables and the rocks to form a compound anti-shear body by grouting to play an anti-sliding role together. Meanwhile, the structure can effectively prevent the slopes from shear sliding with the rock interfaces along the secondary sliding surfaces or concrete in the rocks of the sliding surface footwall.

Description

technical field [0001] The invention belongs to the technical field of rock slope reinforcement engineering, in particular to a concrete shear support structure for strengthening the deep slip surface of rock slopes. Background technique [0002] The anchor hole is an engineering structure for strengthening the rock slope with a large buried depth of the sliding surface. Anchor holes are widely used in the treatment of rocky slopes, especially large deep landslides controlled by weak structural planes, especially in slope reinforcement projects of water conservancy and hydropower projects. [0003] The shafts of the existing concrete anchor holes are generally arranged parallel to the sliding direction, and are horizontal or slightly inclined to the inside. The main steel bars (or section steel, steel pipe) distributed in a circular distribution are arranged in the anchorage hole along the hole axis, and the hole is filled with concrete, and the main steel bars are mainly s...

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Problems solved by technology

[0006] (2) During the tension or bending process of the existing anchor hole, the concrete in the tension area is very easy to be cracked and damaged. When the tensile strength of the main reinforcement under tension is insufficient, it is easy to cause the steel bar to break and produce wider cracks, and even cause Complete failure of the anchor hole

[0007] (3) The reinforcement effect of the existing anchor hole is mainly realized by the shear and bending effects of its own materials, and the purpose of strengthening the landslide mass is not achieved through the joint action of the anchor hole and the slope rock mass

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