High-speed rail bridge adjacent isolation pile foundation and overload construction model test system

A technology of model testing and isolated piles, which is applied in the fields of geotechnical engineering and bridge engineering, can solve the problems that have not yet been considered in the surcharge construction, isolation pile construction, high-speed rail vibration coupling model test system, etc., to achieve strong adaptability to working conditions, The effect of high utilization

Active Publication Date: 2021-03-23
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current physical model test systems can only consider a single construction condition, and there is no model test system that can consider the coupling effect of surcharge construction, isolation pile construction and high-speed rail vibration

Method used

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  • High-speed rail bridge adjacent isolation pile foundation and overload construction model test system
  • High-speed rail bridge adjacent isolation pile foundation and overload construction model test system
  • High-speed rail bridge adjacent isolation pile foundation and overload construction model test system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Pile row penetration construction test

[0059] Control the longitudinal beam 203 of the reaction force frame 2 to move along the Z-axis guide rail 210, the No. I beam 2041 to move along the Y-axis guide rail 209, and the transmission block 205 to move along the X-axis guide rail 208, and the servo drive connected to the No. I beam 2041 The actuator 301 moves to the pile position of the isolated pile foundation 103 to be constructed; the servo actuator 301 is raised to a certain height, and the first isolated pile foundation 103 to be constructed is erected upright to ensure that the pipe pile is vertical to prevent eccentric compression; and then through the loading system 3 Pressurize, the servo actuator 301 descends slowly and at a uniform speed, and pushes the first isolated pile foundation 103 to be constructed to be pressed into the soil; if the stroke of the servo actuator 301 is insufficient, it can be pressed in multiple times to complete the first is...

Embodiment 2

[0060] Embodiment 2: Heap load construction test

[0061] In the model test box 101, the surface of the soil sample material in the target test area is divided and marked to be piled up, and the soil material 102 to be piled up is stacked to a predetermined position to complete the application of the first-level pile load; then continue to pile up the soil sample material load until it reaches the predetermined height, and complete the secondary and tertiary stacking.

Embodiment 3

[0062] Example 3: High-speed rail operation vibration test

[0063] Before filling the soil sample material in the model test box 101, mark the embedding position of the high-speed rail bridge model 104 on the inner wall of the side plate 1015. When the soil is filled to the vicinity of the marked area, put the high-speed rail bridge model 104 into it, and fill the soil while ensuring the vertical state of the model To the predetermined elevation, cover the high-speed rail bridge cap 1042. When filling to the bridge pile foundation 1041, pay attention to compact the soil sample material near the bridge pile foundation 1041; place the loading distribution beam 304 on the track fastener of the bridge deck 1044 to load The contact 1045 is fixed, and the longitudinal beam 203 of the control reaction force frame 2 moves along the Z-axis guide rail 210, the No. II beam 2042 moves along the Y-axis guide rail 209, and the transmission block 205 moves along the X-axis guide rail 208. T...

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Abstract

The invention relates to the technical field of geotechnical engineering and bridge engineering, and provides a high-speed rail bridge adjacent isolation pile foundation and overload construction model test system. The high-speed rail bridge adjacent isolation pile foundation and overload construction model test system comprises a model test box system, a counter-force frame and a loading system,wherein the model test box system comprises a model test box, a to-be-overloaded soil body material, a to-be-constructed isolation pile foundation and a high-speed rail bridge model. Independence andcoupling effects of an isolation pile foundation construction working condition, a overload construction working condition and a high-speed rail train operation vibration working condition can be achieved; the counter-force frame can realize free movement of a loading system along the X axis, the Y axis and the Z axis, and provides support counter-force for the loading system; and the loading system is used for applying a uniform penetration load to the to-be-constructed isolation pile foundation, or applying a uniform vibration load to a rail fastener loading contact. The modular design is adopted, all functional modules are relatively independent, the utilization rate of the test system is high, the working condition adaptability is high, and an integrated test solution can be provided for related engineering problems, teaching and scientific research.

Description

technical field [0001] The present application relates to the technical fields of geotechnical engineering and bridge engineering, and in particular to a construction model test system for isolated pile foundations and surcharges adjacent to high-speed rail bridges. Background technique [0002] With the improvement of my country's high-speed rail lines, in the high-speed rail bridge crossing zone, the long-term repeated action of the vibration load generated by the train operation will affect the bridge structure itself and the surrounding environment. For large-scale construction projects such as high-speed rail vehicle foundations, large-area and repeated accumulation loads such as construction equipment and soil may be involved due to river diversions and site filling. There will also be compound loading effects on adjacent areas. This surcharge will affect the original stress of the stratum, and the additional stress generated by it will cause the surrounding soil to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 何峰黄昕张子新傅承诚陈叶丰寿其牛汪龙杰张乾魏征梁伟
Owner TONGJI UNIV
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