Optimal Calculation Method for Design of Gravity Anchor on Calcareous Rock and Soil

Abstract

The invention discloses an optimizing calculation method for design of a gravity anchor on calcareous rock soil. The method includes the steps that the component forces of the anchor chain load borne by the gravity anchor in the horizontal direction and the vertical direction are determined, and the saturated unit weight of undisturbed soil and an internal friction angle are determined; whether the undisturbed soil belongs to calcareous sand, calcareous gravel or calcareous rock is judged; the gravity of the gravity anchor is calculated, by means of an ABAQUS finite element tool, finite element models in which the gravity anchor and the undisturbed soil interact with each other are built for different basal areas, a horizontal bearing force-basal area relationship curve is drawn, the basal area corresponding to the largest horizontal bearing force is the optimal basal area of the gravity anchor, and then the width and the height of the bottom face of the gravity anchor are determined; and the number and the thickness of shearing force keys and the weight of the single shearing force key are determined, and therefore the structural type of the gravity anchor is determined. According to the optimizing calculation method for design of the gravity anchor on the calcareous rock soil, different friction coefficients can be selected according to different soil texture conditions of the calcareous rock soil, and influences of the friction force between the gravity anchor and the undisturbed soil and the depth of the sliding face on the horizontal bearing force of the gravity anchor are considered comprehensively.

Description

technical field [0001] The invention relates to a method, in particular to an optimal calculation method for the design of gravity anchors on calcareous rock and soil. Background technique [0002] With the development of economy and science and technology, the number and scale of offshore engineering structures and offshore platforms are increasing day by day. Compared with land, the marine operating environment is undoubtedly more complex, which puts forward higher requirements for deep-water anchoring devices placed on the seabed. There are many types of anchors and each has its own advantages and disadvantages. Therefore, it is necessary to choose different anchoring forms suitable for it in different sea areas. Gravity anchors are the commonly used anchoring form in widely distributed sandy soil formations. Therefore, it is necessary to design the structural form of the gravity anchor safely, economically and rationally under this geological condition. [0003] Gravi...

AI Technical Summary

Problems solved by technology

The existing design methods only consider the relationship between the friction force between it and the anchor soil when designing the width of the gravity anchor. In fact, this ignores the influence of the depth of the sliding surface on the horizontal bearing capacity of the gravity anchor. The width of the anchor is also related to

Therefore, for those cases where the sliding surface occurs inside the undisturbed soil, the predicted horizontal bearing capacity of the gravity anchor structure designed based on this method inevitably has a large deviation from the actual value

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