Abstract：Research purposes：The design and calculation method are unsatisfactory for joint use of the pre-reinforcement pile and soil-nailing or retaining walls for reinforcing embankment. Especially there is no a report on the influence of the soil-arch effect on the soil-nailing or retaining wall between piles. Generally, the traditional design of it is made according to the experience without full consideration. Combining the research and experiment for the Nanning-Kunming Railway, this paper discusses this issue in theory and presents the new views on it for providing the reference.
Research conclusions：For forming a soil-arching effect between two piles, the stiffness of the retaining structure between piles must belower to make the soil behind the retaining wall forming a loosing condition for unloading the soil-arch. At this moment, the soil pressure on the pile is different than the retaining wall. Namely, the soil pressure on the pile is bigger than the retaining wall. This loading mode requires no very strong soil-nailing wall and retaining wall between piles. At the same time, as the max arch rise is in the middle of span with no more than 3m and the arch rise near the pile is small, it is proposed the nail length in the middle of span is 3m longer than those on two besides, and the nails length on besides should not be too long.
蒋楚生；赵晓彦；李庆海；贺 钢. 桩与土钉或挡土墙联合使用时设计理论探讨[J]. 铁道工程学报, 2010, 27(4): 35-39.
JIANG Chu-sheng, ZHAO Xiao-yan, LI Qing-hai, HE Gang. Discussion on Design Theory on Joint Use of Pile and Soil-nailing or Retaining Walls. 铁道工程学报, 2010, 27(4): 35-39.
Jiang Zhongxin, Distribution Map Forms of Active Earth Pressure on Retaining Structures in Nanning-Kunming Railway[J]. Chinese Journal of Rock Mechanics and Engineering, 2005(6): 1035-1040.
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2010, Vol. 27 
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