Long-term comprehensive stiffness prediction method of coastal cement-soil piles

A technology of cement-soil piles and prediction methods, which is applied in construction, foundation structure tests, foundation structure engineering, etc., can solve problems such as unstructured design, save test costs, reduce workload, and avoid time-consuming and labor-intensive Effect

Active Publication Date: 2017-05-03
SHANDONG UNIV
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Problems solved by technology

However, there is currently no prediction method for the long-term stiffness of cement-soil piles in coastal corrosion environments, which makes the design of cement-soil pile composite foundations in coastal areas haphazard

Method used

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  • Long-term comprehensive stiffness prediction method of coastal cement-soil piles
  • Long-term comprehensive stiffness prediction method of coastal cement-soil piles
  • Long-term comprehensive stiffness prediction method of coastal cement-soil piles

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0063] The implementation steps are:

[0064] (1) Make 20 identical cylindrical cement-soil specimens with a size of φ50mm×50mm, and divide them into two groups for curing in the curing room and seawater immersion curing respectively, simulating the uneroded environment inside the coastal cement-soil pile body and the cement-soil pile An environment where the surface is eroded by seawater. Obtain the uniaxial compressive strength q of cement-soil specimens of different ages under different curing conditions by uniaxial compression test uc and q uw , under the same curing conditions, carry out two sets of tests on cement-soil specimens of each age, and take the average value;

[0065] (2) According to the obtained compressive strength of cement-soil specimens of different ages under different curing conditions and the formulas (1) and (2), calculate t...

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Abstract

The invention discloses a long-term composite stiffness prediction method for coastal cement-soil piles. The invention adopts the following technical scheme: a plurality of cement-soil test specimens which simulate coastal cement-soil piles are fabricated, the cement-soil test specimens are divided into two groups and are respectively subject to curing in a curing room and seawater immersion curing, and the uniaxial compressive strengths quc and quw of the cement-soil test specimens at different ages under the curing condition in the curing room and the seawater immersion curing condition are respectively obtained; formula fitting is carried out on deterioration depth L and compressive strength quc, so that the time-dependent change relation of the deterioration depth of the cement-soil piles in the coastal corrosion environment is obtained, a time-dependent growth model of the deformation modulus of the undeteriorated cement and soil in the cement-soil piles is determined, the long-term composite stiffness Ec of the coastal cement-soil piles is obtained, and thereby the change of the long-term composite stiffness of the cement-soil piles is obtained. By a short-term compressive strength experiment result obtained in a lab, the long-term composite stiffness prediction method for the coastal cement-soil piles can predict the bearing capability of salty cement-soil piles in the whole life cycle, and solves the problem that field measurement cannot be carried out in certain regions.

Description

technical field [0001] The invention belongs to the field of civil engineering, in particular to a method for predicting the comprehensive stiffness of cement-soil piles after they deteriorate in coastal corrosion environments. Background technique [0002] In the construction of houses, roads and many other projects, there are a large number of weak foundations that need to be reinforced. In view of the advantages of cement soil, which can be obtained locally, convenient construction, low price, high strength, and good stability, etc., cement soil piles become weak foundations. A common method of reinforcement. In the design of composite foundation, two indicators are very important: one is the bearing capacity of the foundation; the other is the settlement of the foundation. Under the condition of certain soil mechanical parameters of the foundation, the bearing capacity of the foundation depends on the strength of the pile, and the settlement of the foundation depends on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
Inventor 崔新壮侯飞金青黄丹张炯郑英杰楼俊杰汤潍泽王磊
Owner SHANDONG UNIV
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