Method for measuring full-length cohesive soil anchorage de-bonding length and dynamic anchorage force

Abstract

The invention discloses a method for measuring full-length cohesive soil anchorage de-bonding length and dynamic anchorage force. The measuring method is mainly characterized in that based on advantageous shear failure characteristics of an anchorage soil interface, a de-bonding length change value of an anchorage structure is determined according to a total displacement composition of an anchorage body when a rod body is completely coupled with the anchorage body, anchorage soil interface shearing stress index attenuation characteristics and slippage failure assessment thereof, and dynamic anchorage force is further obtained. The method can be used for performing dynamic monitoring, anchorage effect assessment and anchorage reinforcement on anchorage force, so that disasters are reduced; moreover, a monitoring process and a calculating process are clear, operation is simple and convenient, environmental adaptation is strong and cost is low, so that the problem that anchorage force fixation as well as a complex dynamic monitoring technology thereof and reinforcing grouting amount depend on experience is overcome, and better theoretical significance and a higher economic value are shown, and therefore, practice can be guided better.

Description

technical field [0001] The invention belongs to the technical field of rock-soil anchorage effect evaluation technology and anchorage reinforcement control method, and in particular relates to a method for measuring the full-length cohesive soil anchor debonding length and dynamic anchorage force. Background technique [0002] The realization and development of anchoring technology is an important symbol of modern geotechnical engineering. As one of the most effective measures for geotechnical engineering reinforcement, it has small disturbance to the structure, can control the deformation of the structure, fast construction speed, practical, safe and economical, etc. Features, especially the prestressed anchoring technology can give full play to the self-strength and self-supporting ability of the anchoring system, can greatly reduce the structure's self-weight, save engineering materials, and reduce costs. It has been used in building foundation pits, traffic slopes, mine s...

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Problems solved by technology

In theoretical research, it is usually assumed that the medium material of the soil anchorage structure is homogeneous, continuous, isotropic, etc., and the physical and mechanical parameters of the material do not change during the anchorage service period, and the anchorage debonding and anchorage-soil interface are rarely considered. Anchor failure accidents caused by the influence of relative displacement and dynamic anchor force attenuation on anchor parameters and anchor effects are not uncommon, and patent cases involving anchor debonding, relative displacement of anchor-soil interface, and dynamic anchor force monitoring and detection methods are still rare , and the empirical or semi-empirical method is still used in the design and construction of the anchoring project, so it is difficult to make a quantitative evaluation of the anchoring effect and grouting reinforcement. Detection, optical fiber displacement sensing technology, and even destructive experiments are carried out, and most of the experimental results are obtained instantaneous values. The anchorage length is also determined by cumbersome calculations based on the range of the plastic zone. This type of method is not only technically difficult and expensive Moreover, the environmental requirements are relatively high, so the dynamic change of debonding length and anchoring force is a technical problem, and there is still a lack of simple and feasible solutions

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