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Jing W.,Lanzhou University of Technology | Cheng X.,Lanzhou University of Technology | Yin C.,Gansu huaxing oil engineering Co. | Li C.,Gansu huaxing oil engineering Co. | Zhang W.,Gansu huaxing oil engineering Co.
Electronic Journal of Geotechnical Engineering | Year: 2015

As liquid-storage tanks become larger, it brings many new problems, such as storage tank's tilt, collapse and damage of accessory components caused by unusual settlement; lower safety factor of composite foundation can't ensure the necessary safety reserve for this special structure. Therefore, it is urgent to develop an analytical method for this special structure which is closer to mechanical behavior of practical engineered systems. This paper takes composite foundation treated with compaction piles of Lintao oil depot of PetroChina Gansu branch as the engineering background and simplifies a large number of decentralized piles arranged with regular triangle as a model in which continuous circular piles and compacted soil are arranged alternately, the pile-soil-structure interaction model is established by applying the finite element method. Through the solution of deformation and stability, it shows that the maximum settlement value is smaller than the limit value of standards and the differential settlement can also meet the requirements, the safety factor is greater than the general value which is required 2 in engineering. At the same time, the maximum settlement of composite foundation is calculated by using the theoretical formula, the theoretical solution is close to settlement value calculated by the finite element method, so that the rationality of the simplified method put forward in this paper is verified. © 2015 ejge.


Cheng X.,Lanzhou University of Technology | Chen W.,Lanzhou University of Technology | Jing W.,Lanzhou University of Technology | Yin C.,Gansu huaxing oil engineering co. | Shi A.,Gansu huaxing oil engineering co.
Electronic Journal of Geotechnical Engineering | Year: 2015

Area replacement ratio is an important parameter in the treatment process of composite foundation, it not only concerns final treatment effect, but also has the direct bearing on economic problem of engineering. This paper takes the Lintao oil depot engineering of Gansu branch of PetroChina as the background, and establishes the space model of composite foundation and the upper structure by applying the finite element method. Then the static deformation and stability are solved when the area replacement ratio are 10%, 15% and 20%. The calculation results show that the increase of area replacement ratio has great influence on structural settlement when the area replacement ratio is small, and the increase of compaction area has slight influence on settlement value when area replacement ratio is larger. Through the stability analysis, the safety factors grow as the increase of area replacement ratio and the safety factors that correspond to three area replacement ratio are larger than 2 in general engineering, the area replacement ratio has greater influence on the stability than the settlement. The rule that area replacement ratio has influence on composite foundation treatment effect is obtained in this paper, and it can provide reference for the design of similar project in the future. © 2015 ejge.

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