Rock-inserted steel pipe pile load test device and method under cyclic loading effect

Abstract

The invention belongs to the technical field of ground and foundation engineering and oceanographic engineering, and relates to a rock-inserted steel pipe pile load test device and method under the cyclic loading effect. Oriented pulleys are installed and fixed to the ends of a cuboid model box. A steel pipe model pile and a steel block weight are connected together through a thin long steel wireby means of the oriented pulleys at the ends. After a steel pipe model pile is inserted in rock by a certain depth, the horizontal cyclic load is simulated by applying the steel block weight, the horizontal displacement of the ends of the steel pipe model pile is recorded by a laser displacement sensor after the steel block weight is applied, and therefore the horizontal bearing property of the steel pipe model pile under the effect of different rock insertion depth and different loads and frequencies is obtained, and the theoretical basis is provided for the design of the large-diameter super-long steel pipe pile under actual working conditions. The rock-inserted steel pipe pile load test device and method are simple in structure, convenient to operate, accurate in test data, low in costand friendly to the environment.

Description

Technical field: [0001] The invention belongs to the technical fields of foundation and foundation engineering and marine engineering, and relates to a design and testing method of a rock-socketed pile loading device under horizontal load, in particular to a loading test device and testing method of rock-socketed steel pipe pile under cyclic loading. Background technique: [0002] In recent years, with the rapid development of national economic construction and marine engineering, port engineering and large-scale bridge engineering construction are developing in open sea and deep water areas, and cross-sea and river-crossing bridges are also moving towards large-scale and complex; at the same time, with the ocean The continuous development and utilization of oil and gas and offshore wind power industries require more structures to be built in sea areas with complex and changeable environments, severe waves and tides, and complex geological conditions. In this case, large-diam...

AI Technical Summary

Problems solved by technology

The occurrence of soil plugging effect during the sinking process of large-diameter and super-long steel pipe piles also makes the focus of pile foundation design gradually shift from the control of vertical bearing capacity to the effective control of horizontal displacement of piles. The design parameters of steel pipe piles are often conservative, resulting in a lot of waste. A few qualified projects determine the bearing capacity and other parameters of the pile through static load tests, and the test costs are relatively high.

Moreover, there are few experimental and research data on the horizontal bearing capacity of ultra-long-diameter rock-socketed steel pipe piles, and the research on the determination method of the rock-socketed depth is even weaker, and there are few in-depth and systematic research data.

Images