Simplified analysis method for prestress expansion anchor cable anchoring structure deformation

Abstract

The invention discloses a simplified analysis method for prestress expansion anchor cable anchoring structure deformation. The method comprises the following steps that an ultimate pull-out test is carried out on an anchor cable, a load-displacement cyclic curve is obtained, and a load-displacement curve is obtained through arrangement; a creep test is carried out on the anchor cable, a creep-time relation curve and a creep rate relational expression are obtained, and the creep value of the anchor cable which reaches the designed working life is determined; the prestress loss value of the anchor cable is determined in the load-displacement curve by means of designed uplift bearing capacity and the creep value of the anchor cable which reaches the designed working life; prestress of the anchor cable which reaches the designed working life is determined by means of a designed prestress tension locking value and the prestress loss value; anchor cable total deformation of the anchor cable which reaches the designed working life is calculated by means of the designed uplift bearing capacity, the prestress of the anchor cable which reaches the designed working life and design parameters of the anchor cable and an anchoring structure; and the anchoring structure deformation is determined by means of the anchor cable total deformation and the included angle between the anchor cable and an anchoring structural face, and finally whether the anchoring structure deformation meets using requirements or not is evaluated.

Description

technical field [0001] The invention relates to the technical field of geotechnical anchoring in civil engineering, and more specifically, relates to a simplified analysis method for deformation of a prestressed expansion anchor cable anchorage structure. Background technique [0002] Geotechnical engineering anchoring technology is widely used in deep and large foundations because it can fully utilize and improve the strength and self-stabilization ability of rock and soil mass, reduce structure volume and self-weight, save material and labor costs, and be conducive to construction safety. Pit support engineering, underground space anti-floating engineering and other fields. With the increasing demand for high-capacity anchors in the engineering field, various anchoring technologies have been vigorously developed at home and abroad in recent years, and the expanded anchor cable with an enlarged anchorage end diameter is one of them. [0003] The expanded body anchor cable ...

AI Technical Summary

Problems solved by technology

The significance of the evaluation of the deformation of the anchorage structure of the prestressed expansion anchor cable is reflected in: 1) When considering the creep and stress relaxation effects of the anchor cable, it is determined that the anchorage structures, such as slopes, foundation pits, underground structures, etc., will deform within the design service life Whether it meets the design requirements; 2) Determine whether the design parameters of the anchor cable, such as the pull-out bearing capacity, prestressed tension locking value, and the length of the free section, are reasonable; 3) Determine the adaptability of the prestressed expansion anchor cable; Technical standards and specifications related to stress anchor cables, such as "Technical Specifications for High-pressure Injection Expanding Head Anchor Rods" JGJ / T 282, "Technical Regulations for Rock and Soil Anchor Rods (Cables)" CECS22, etc., have not yet determined the deformation analysis and evaluation of anchoring structures. method

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