Experimental simulation equipment and method for marine engineering pile foundation under long-term horizontal cyclic loading

Abstract

The invention discloses an ocean engineering pile foundation experiment simulation apparatus and method under long-term horizontal cyclic loading. The apparatus comprises: an osmotic force system which provides continuous pressurized water for a saturated sandy soil foundation so that a uniform osmotic flow field forms in the sandy soil foundation to simulate a hyper-gravity environment; a displacement control loading system and a force control loading system that apply horizontal cyclic loadings to an offshore wind turbine superstructure model; a measuring system used for measuring water pressure before the entry into the saturated sandy soil foundation, displacements of the offshore wind turbine superstructure model and a pile model, strain of the pile model, and surface displacement of sandy soil; an uninterrupted power supply system used for powering the osmotic force system, the displacement control loading system, the force control loading system and the measuring system, thereby ensuring all systems can run stably in a long time; the invention also provides an experiment method of the apparatus; the apparatus and the method are widely applicable and suitable for various ocean engineering structures such as oil platforms and offshore wind turbines.

Description

Technical field [0001] The invention belongs to the technical field of marine engineering pile foundation model test, and specifically relates to a marine engineering pile foundation test simulation equipment and method under long-term horizontal cyclic load, which simulates the pile-soil interaction under long-term horizontal cyclic load. Background technique [0002] With the increasing pace of the development of marine resources, marine projects such as offshore oil platforms and offshore wind turbines have developed rapidly. Ocean engineering has been subjected to long-term effects of horizontal cyclic loads such as sea breeze, waves, and ocean currents (10 6 ~10 9 Cycles). Under the action of long-term cyclic loading, the reliability of the superstructure, foundation and foundation will be reduced to varying degrees. The foundation form of ocean engineering is mainly pile foundation. Excessive deformation, overturning, fracture and other damages caused by pile foundation u...

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Problems solved by technology

However, the load applied in the above test is a vertical static load, and the short-term action of the simulated load (the test period is within 1 day), and the measured variables are limited to displacement

In addition, seepage channels are easily formed on the contact surface between the soil and the model box by using the seepage force test, resulting in uneven seepage field and affecting the credibility of the test results

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