Expressway Corporation of Anhui Province

Hefei, China

Expressway Corporation of Anhui Province

Hefei, China

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Gong W.,Nanjing Southeast University | You Z.,Nanjing Southeast University | Yin Y.,Expressway Corporation of Anhui Province | Tong X.,Nanjing Southeast University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

Root-caisson foundation is based on the bionics principle. The construction procedure involves sinking a caisson with reserved holes in the sidewall, then pushing prefabricated rootstalks into the soil through the jack hole after the caisson has been sank to the design level, and casting concrete to make sure that rootstalks are fixed with the caisson. It suits well in structures with significant extraction-resistantce, and vertical and horizontal bearing capacity. For an anchorage foundation of the Changjiang River Bridge in Maanshan City, three field tests have been carried out using lateral static loading test method to acquire the horizontal displacement and bearing capacity of the group root-caisson foundation. The lateral group efficiency of the root-caisson foundation is analyzed. The result shows that a conservative value of lateral group efficiency is about 1.35, cap-restraint efficiency is about 1.49, and both could increase with the development of root-caisson quantity and the horizontal displacement.


Hu F.,Nanjing Southeast University | Gong W.-M.,Nanjing Southeast University | Tong X.-D.,Nanjing Southeast University | Yin Y.-G.,Expressway Corporation of Anhui Province | Shan J.,Nanjing Southeast University
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2010

Based on the load transfer method and the Winkler beam theory, considering the bending effects of roots and reduced effects from the overlapping of roots, an elastic solution of bearing capacity of root-caisson with flexual roots is deducted. The computational values of displacement are close to the test results in elastic range. The vertical distributions of displacement and axial force curves are presented. We also analyze the bearing behavior of root and the proportion of each part of soil resistance. From the computational results, it is concluded that the bearing capacity of root-caisson is superior to the traditional caisson foundation, so the root-caisson can be utilized in the bridge engineering. However, as the bending effects of roots reduce the bearing capacity of root-caisson, improving the bending stiffness of roots is particular necessary.


Wang L.,Nanjing Southeast University | Gong W.,Nanjing Southeast University | Yin Y.,Expressway Corporation of Anhui Province | Tong X.,Nanjing Southeast University
Geotechnical Special Publication | Year: 2014

According to the situation of the shortage of the bearing capacity of the soft and thick covering stratum, the root-caisson foundation - a new type of foundation - was introduced. The construction procedure involves: (1) sinking a caisson with reserved holes in the side wall; then, (2) pushing prefabricated roots into the soil through the reserved holes by the jack after the caisson has been sunk to the design level; and (3) casting concrete to make sure that the roots are fixed with the caisson. The mechanism of vertical bearing capacity of root-caisson foundation was analyzed, and the improvement of bearing capacity due to the soil compaction and the bending resistance of roots was discussed. The self-balanced test method was utilized in the field tests to investigate the vertical bearing behavior of a root-caisson foundation with a traditional one. The results indicate that: (1) the roots are capable of activating a large range of soil to bear the load, and (2) with reasonable installation of roots, the ultimate bearing capacity of a root-caisson foundation is greatly larger than that of a traditional caisson foundation. Compared with the traditional caisson, the vertical bearing capacity of a root-caisson foundation could be increased by100%. © 2014 American Society of Civil Engineers.


Yin Y.,Expressway Corporation of Anhui Province | Sun D.,Expressway Corporation of Anhui Province
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

Domestic and overseas anchorage foundations of suspension bridges are mostly gravity anchorage foundations at present, such as super large open caisson anchorage foundation and diaphragm wall anchorage foundation. This paper introduces a new anchorage foundation-root anchorage foundation, made of many root foundations. By means of a series of scaled-down model tests of root anchorage foundations and FLAC 3D numerical simulation, this paper sums up the working mechanics of root anchorage foundation. It is found that root anchorage foundation scheme is feasible and satisfies the displacement requirements and bearing capacity requirements of suspension bridges. We also find that both the friction at the bottom of anchorage and the passive earth pressure in front of anchorage bear the load of cable tension of suspension dridge, which is different from the traditional design theory.

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