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Testing device and testing method for testing normal contact stress of pile-soil interface under variable temperature condition

A technology of contact stress and test equipment, applied in lighting and heating equipment, using stable tension/pressure to test material strength, application, etc., can solve the difficulty of accurately judging the maximum static friction force of the pile-soil interface, and the change law of normal stress Unclear understanding and other problems to achieve good stability

Pending Publication Date: 2017-05-24
NANJING UNIVERSTIY SUZHOU HIGH TECH INST +1
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Problems solved by technology

At present, there are few studies on the normal stress of the pile-soil interface under variable temperature conditions. Due to the unclear understanding of the change law of the normal stress, it is difficult to accurately determine the maximum static friction force of the pile-soil interface.

Method used

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  • Testing device and testing method for testing normal contact stress of pile-soil interface under variable temperature condition
  • Testing device and testing method for testing normal contact stress of pile-soil interface under variable temperature condition
  • Testing device and testing method for testing normal contact stress of pile-soil interface under variable temperature condition

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Embodiment Construction

[0033]The equipment and method for the normal contact stress test of the energy pile-soil interface under variable temperature conditions proposed by the present invention will be described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "bottom" etc. is based on the orientation or positional relationship shown in the drawings The positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc. It does not indicate the importance of components, so it should not be construed as limiting the present invention. The specific dimensions used in this embodiment are...

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Abstract

The invention discloses a testing device and a testing method for testing the normal contact stress of a pile-soil interface under the variable temperature condition. The testing device comprises a frame, a vertical pressure loading system, a pile-soil interface simulation system, a water circulation temperature control system and a data acquisition system, wherein the pile-soil interface simulation system comprises a base and a ring-shaped concrete box, a soil sample and the ring-shaped concrete box are put into a space in the middle of the base, and the pile-soil interface simulation system is used for simulating the pile-soil interface; the water circulation temperature control system is used for simulating the temperature change process of a pile body. According to the testing device and the testing method, the temperature of the ring-shaped concrete box is controlled by means of water circulation, so that the processes of temperature rise and temperature drop in a heat exchange process of an energy pile can be simulated. Test data is provided for the change mechanism study of the normal contact stress of the pile-soil interface under the action of hot and cold cycling by means of data collection and analysis. The testing device and the testing method are used for mastering the change of mechanical properties of the energy pile and promoting the popularization and application of an energy pile technology, and have important theoretical research and engineering guide values.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering tests, in particular to a pile-soil interface normal contact stress test equipment and a test method under variable temperature conditions. Background technique [0002] Energy piles, also known as energy piles, are a technology that uses underground pile foundations as heat exchangers for ground source heat pump systems. In recent years, with the increasingly serious problems of energy crisis and environmental pollution, ground source heat pump technology has been widely developed and applied as a green and sustainable new energy technology. This technology uses the heat capacity of the earth to store indoor heat in summer. It is used underground for heating in winter and also achieves the purpose of indoor cooling in summer. Because the traditional ground source heat pump technology needs to drill holes outside the construction site, it not only takes up additional space but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
CPCG01N3/18G01N2203/0019G01N2203/0224F24T2201/00Y02E10/10
Inventor 张丹刘子文丁大勇刘春程健陈卓
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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