A method for measuring the anchoring force of soil layer bolts in the process of water level change

Abstract

The invention discloses a method for measuring the anchoring force of a soil layer anchor rod in the process of water level change. The method of the present invention is mainly based on the geometric characteristics of the anchor mesh surface and the arrangement of the anchor rods to establish a geological detection section to obtain the embedding position of the anchor rods; to the mortar anchor; then place a measuring drill rod vertically in each borehole, fix it through the positioning frame, and then install the force sensor on the boundary of the anchor at the bottom of the hole; according to the hole positioning frame and the percentage According to the reading of the table, the displacement conversion along the direction of the anchor rod is carried out to determine the installation angle of the anchor rod, the relative slippage of the anchor-soil interface and the remaining length of the anchor section. Finally, the anchoring force is determined through theoretical analysis. The invention is simple and easy to implement, has the advantages of accurate monitoring, strong environmental adaptability and fewer problems.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for measuring the load-bearing characteristics of an anchorage structure in a water environment, the enhanced stability of soil reinforced by a prestressed anchor, and the dynamic anchoring force of an anchor in a soil layer during a water level change process. Background technique [0002] The impact of water level changes on geotechnical engineering structures is mainly reflected in the change of load conditions, stress adjustment and weakening of material strength, among which the load conditions are the most important, which mainly cover buoyancy force, capillary force, hydrodynamic pressure, drifting objects, etc. Complex stress effects such as impact force, wave force, scouring erosion and biochemical force; stress adjustment is mainly due to the change of stress conditions of rock and soil structures caused by water load, which induces ...

AI Technical Summary

Problems solved by technology

[0004] At present, issues such as the debonding characteristics of the anchor-soil interface in water environments, anchorage load transfer, prestress loss, and anchorage force measurement have always been obstacles to geotechnical engineering disaster prevention and mitigation and infrastructure construction under complex conditions. Disasters and accidents caused by anchorage failure are not uncommon. However, in the design and construction of geotechnical engineering reinforced by prestressed anchor bolts, the value of dynamic anchorage force and anchorage effect are mostly based on experience, and the impact of water level changes on the anchored structure is rarely considered. Influenced by the mechanical properties and stability of the material, it is also difficult to grasp the real-time change characteristics of the anchoring force. At the same time, the measurement of the anchoring force still uses the land bolt test method, and the anchorage bearing test is also a transient destructive experiment, which leads to the anchorage load. force distortion

Therefore, the measurement and real-time tracking of underwater anchoring force is a technical problem, and there is still a lack of simple and high-precision measurement methods

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