Three-directional static and dynamic loading model test platform for deep water foundations of bridges

Abstract

The invention discloses a three-directional static and dynamic loading model test platform for deep water foundations of bridges. The three-directional static and dynamic loading model test platform comprises a test foundation trench, a vertical loading system, a horizontal bi-directional loading system and a water level simulating system. The test foundation trench is used for arrangement of foundation soil, water and models. The vertical loading system used for applying vertical static and dynamic action on the models is installed at the top of the test foundation trench, the horizontal bi-directional loading system used for applying two or more horizontal static and dynamic actions on each model is installed on the upper portion of the inner side wall of the test foundation trench, and the water level simulating system used for water feeding and draining and test water level control in the test foundation trench is installed on the bottom and the outer side of the outer side wall of the test foundation trench. Test and research on the models of bridge deep water foundations such grouped piles, sink shafts, caissons and compound foundations and bridge towers (piles) under three-directional static and dynamic actions such as the vertical static and dynamic action and the horizontal bi-directional static and dynamic action can be carried out by the test platform, and the test platform solves problems about simulation of static and dynamic mutual action of the foundation soil-water-bridge deep water foundation-bridge tower (pile) under the combined working conditions of vertical force, horizontal force, bending moment, torque and the like.

Description

technical field [0001] The invention relates to the technical field of foundation engineering, in particular to a three-way static and dynamic loading model test platform for deep-water foundations of bridges. Background technique [0002] As bridge construction moves from the inland to the open sea, construction conditions such as deep water, soft foundation, strong wind, rapids, waves, and strong earthquakes become more complex, and the required bridge spans are also increasing. Compared with small and medium-span bridge foundations, deep-water foundations of long bridges not only need to bear greater vertical loads, but also face huge horizontal forces due to disasters such as ship collisions, strong earthquakes, strong winds, and huge waves. These horizontal forces and The effect of the additional bending moment on the foundation caused by it can even reach the same magnitude as the vertical force. The stress mode and bearing performance of the foundation are obviously d...

AI Technical Summary

Problems solved by technology

The advantage of the centrifugal model test is that the prototype stress field can be reproduced with a smaller model, but its disadvantage is the particle size effect of the soil. In addition, due to the small size of the model, it is difficult to select, arrange and embed the measuring instruments; the field model test and The consistency of the prototype is good, but the cost is expensive, the cycle is long, and there are many interference factors. Most of them are used as the final verification of some important projects

For example, the urban underground engineering simulation test system can realize three-dimensional loading and groundwater impact simulation tests on various types of urban underground engineering. However, the tank structure of this type of test platform is a small-sized steel structure with limited loading capacity and horizontal direction The actuator needs to be installed along the column and the loading position cannot be adjusted flexibly, and the achievable loading method is still relatively simple

Images