Interfacial shear stress measurement device for pre-stressed anchor and testing method thereof

Abstract

The invention provides an interfacial shear stress measurement device for a pre-stressed anchor. The device comprises a rod body, a PVC pipe which is arranged above the rod body and parallel to the rod body and is used for importing lead wires, at least one PVC pipe ring which is connected with the PVC pipe and is alternately embedded outside the rod body; rectangular slots are respectively formedin two sides of the PVC pipe ring; the rod body comprises an inner anchoring section extending into surrounding rock and a free section extending out of the surrounding rock; strain gauges I are respectively adhered to two sides of the rod body corresponding to the position of each PVC pipe ring, and a fine steel bar is hinged in the position; the strain gauges I are distributed on the inner anchoring section according to testing requirement; strain bricks adhered with strain gauges II are respectively drawn out by the fine steel bar toward two sides of the rod body, and the strain gauges IIface to a to-be-measured interface; preserved holes for lead wires to penetrate are formed in the position, contacted with the PVC pipe, of the PVC pipe ring; and an external deformeter is connected with the strain gauges I and the strain gauges II respectively through lead wires. The device facilitates better studying of the long-term safety and durability of a rock soil prestressed anchoring structure.

Description

technical field [0001] The invention belongs to the field of measuring devices and test methods, and in particular relates to a prestressed bolt interface shear stress measuring device and a test method thereof. Background technique [0002] Geotechnical prestressed anchorage structure is a high-stress structure buried deep in the ground. Once problems such as poor construction and structural failure occur, it is very difficult to reinforce it. Therefore, not only the stability under normal operating conditions must be considered. More consideration should be given to its long-term durability. There are two interfaces on the anchoring section in the prestressed anchoring structure: (1) the interface between the rod body and the grouting body; (2) the interface between the grouting body and the surrounding rock mass. The research shows that the distribution law of the shear stress at the interface of the anchor section inside the rod directly affects the anchoring effect and...

AI Technical Summary

Problems solved by technology

For the rock-soil prestressed anchorage structure, due to the complexity and concealment of its structure, there is no simple and effective measuring device and test method for the shear stress of the rock-soil prestressed anchor bolt interface in actual engineering.

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