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Liu S.-Q.,Hefei University of Technology | Liu S.-Q.,China Jikan Research Institute of Engineering Investigations and Design Co. | Lu K.-L.,Hefei University of Technology | Zhu D.-Y.,Hefei University of Technology | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

The ultimate bearing capacity of a strip footing on the reinforced sand is studied based on both the limit equilibrium slice method and the critical slip field method. It is assumed that friction of the interface between the soil and reinforcements is uniform when the reinforced foundation soil is in the limit equilibrium state. Based on the limit equilibrium equations of soil slice, a recursion expression of slice force is derived. Firstly, the borders of the soil mass with potential sliding are determined, then soil mass is divided into a series of slices, and the state points is distributed on interfaces between the slices. Secondly, the recursion expression is used to calculate the parameters of all state points and search the critical slip surface. Finally, the bearing capacity can be determined according to the critical slip surface which meets the balance of forces and moments. The reliability of calculation results is shown by comparing with the results in literature. Effects of distance from footing bottom to top reinforcement, layer numbers and length of reinforcement on bearing capacity and slip surface are also presented. The results show that the bearing capacity increases firstly and then decreases as the depth increases, or it increases firstly and becomes stable lastly as layer number and length increase. It is also shown that the slip surface changes mainly in the vertical and horizontal ranges. Because the proposed method is easy to understand and numerically implement, it provides a new idea to calculate the bearing capacity of strip footing on reinforced sand, and it extends the critical slip field method to the calculation of bearing capacity. ©, 2015, Academia Sinica. All right reserved. Source


Deng J.,Xian University of Architecture and Technology | Deng J.,China Jikan Research Institute of Engineering Investigations and Design Co. | Zhang J.,China Jikan Research Institute of Engineering Investigations and Design Co. | Zheng J.,China Jikan Research Institute of Engineering Investigations and Design Co.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

Combining with the rock soil thermal response test, the different method to obtain geotechnical initial average temperature and complex thermal conductivity was compared and analyzed, the results showed that the initial average temperature by reactive power cycle and the thermal conductivity by thermal response test are the design parameter of the ground-source heat pump system, and is more closer to the actual working condition than other methods. The ground heat exchanger thermal performance of different buried types and pipe diameters was compare and analyzed, the results showed that the heat exchanger of 40 mm diameter increase by about 30% than that of the heat exchanger of 32 mm diameter with the same single U-type ground heat exchanger; for the different heat exchanger forms, the heat exchanger of the double U-type ground heat exchanger increase by about 80% than that of the single U-type ground heat exchanger with the same 32 mm diameter; for the different heat exchanger forms and pipe diameters, the thermal performance of double U-type 32 mm diameter increases by nearly 40% than that of the single U-type 40 mm diameter. The results showed that the thermal performance of the double U-type 32 mm diameter heat exchanger is far superior to the single U-type 32 mm diameter and 40 mm diameter heat exchanger, it can be used as preferably heat exchanger type in practical engineering pipe. © 2015, Science Press. All right reserved. Source


Cai H.,China Jikan Research Institute of Engineering Investigations and Design Co. | Zhang J.,China Jikan Research Institute of Engineering Investigations and Design Co. | Qin G.,China Jikan Research Institute of Engineering Investigations and Design Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

Owing to the lack of urban construction land in yan'an, the local government set about a construction project called “truncating the mountain filling in the ditch” in the loess hilly gully region around the city. However, this project faces lots of engineering geological problems because of the complex geographic and geomorphic characteristics and engineering geological conditions. According to the engineering geological investigation to hilly gully region around yan'an city, this paper summarizes and analyzes the types and spatial combination of topography and geomorphy, and the engineering geology structures under the different geomorphologic types. Further, the loess hilly gully region has been divided into different engineering geological regions, and the engineering geology characteristics have been analyzed and evaluated in details. In a word, this paper not only provides the basic datum and guidance for the urban construction land in loess hilly gully region around yan'an city, but also provides guidance on the other projects under similar geological conditions. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved. Source

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