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A seismic test method for karst pile foundations based on a small shaking table model

A test method and technology of a shaking table, which are applied in vibration testing, testing of machine/structural components, measuring devices, etc., can solve the problems of lack of good testing devices and methods, and achieve low testing cost, simple operation and convenient production. Effect

Active Publication Date: 2018-01-02
中铁十一局集团第五工程有限公司 +1
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Problems solved by technology

There are many factors that affect the safe thickness of the cave roof, including geological strength index, cave size, pile diameter, physical parameters of the overlying rock and soil, single pile load, etc. At present, there is no good method for the damage of the underlying cave roof under the earthquake. Test Test Apparatus and Methods

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  • A seismic test method for karst pile foundations based on a small shaking table model
  • A seismic test method for karst pile foundations based on a small shaking table model
  • A seismic test method for karst pile foundations based on a small shaking table model

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Embodiment Construction

[0022] In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

[0023] Such as Figure 1~2 As shown, a karst pile foundation seismic test device based on a small-scale shaking table model, including a model box 1 and a model pile 2, the bottom of the model box 1 is fixed in the middle of the surface of the platform 3, and the platform 3 is provided with The mounting holes 31 for bolts to pass through to be connected to the bolt holes on the surface of the vibrating table. The two surfaces perpendicular to the vibration direction inside the model box 1 are respectively laid with a layer of foam board 4, and the model box 1 is covered with two layers of foam board 4. The gap is filled with model-like material 5 for compaction and grinding, and a karst cave model 6 is fixedly embedded in the middle of the model-like material 5...

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Abstract

The invention relates to a karst pile foundation vibration resistance testing method based on a small vibration table model. The karst pile foundation vibration resistance testing method comprises the following steps of (1) fixing a device, namely fixing a karst pile foundation vibration resistance testing device based on the small vibration table model on the vibration table; (2) selecting a seismic wave, namely selecting the type of the seismic wave, adjusting the acceleration peak value of an input wave to 0.05-0.1g through control software which is loaded in the vibration table, adjusting the vibration time according to a similarity proportion Ct=10, and obtaining a seismic wave acceleration time travel curve; and (3) loading the seismic wave, afterwards loading the seismic wave with the acceleration peak value of 0.1g, performing white noise excitation before each loading, and performing scanning and storage on the seismic response of the model for comparing with the seismic response of the model. The karst pile foundation vibration resistance testing method is a relatively good testing method for damage of cave roofs in a karst region under the seismic function and furthermore has advantages of facilitating reasonable selection for safe thickness of the cave roof and ensuring high engineering safety and high engineering reliability.

Description

technical field [0001] The invention relates to a test method for seismic testing of karst pile foundations based on a small-scale shaking table model, and belongs to the field of seismic testing of karst pile foundations. Background technique [0002] China is an earthquake-prone country, and it is the country with the most frequent earthquakes and the most serious earthquake disasters in the world. Earthquake areas of degrees VI~IX in the mainland account for more than 80% of the country's land area, a large part of which is karst distribution area. With the rapid development of China, there are more and more engineering constructions in karst areas. The engineering geological conditions in the karst area are complex, and the surface densely covered with stone buds and the existence of karst caves all destroy the integrity of the foundation. Especially when an earthquake comes, the existence of caves intensifies the effect of the earthquake. Therefore, it is very necess...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
CPCG01M7/02
Inventor 黄明王元清张光武邓尚强
Owner 中铁十一局集团第五工程有限公司
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