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Experimental on application of variable length pile-plate structure in road-culvert transition section in soft soil area(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年3期
Page:
1-11
Research Field:
道路工程
Publishing date:

Info

Title:
Experimental on application of variable length pile-plate structure in road-culvert transition section in soft soil area
Author(s):
XU Linrong1; 2;  CHEN Yunhao1;  CAO Dehong3;  FENG Duo1
(1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China; 2. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, Hunan, China; 3. Zhejiang Communications Investment Group Co., Ltd., Hangzhou 310014, Zhejiang, China)
Keywords:
road engineering;  variable length pileplate structure;  roadculvert transition;  experiment;  settlement control;  bearing character
PACS:
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DOI:
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Abstract:
In order to explore the action mechanism of variable length pileplate structure in roadculvert transition section in deep soft soil area during filling period, a test section was set up at Huzhou section of G25 Deqing to G60 Tongxiang Highspeed Link Line. Three comprehensive monitoring sections were set up at both ends and in the middle of the variable length pileplate structure according to the change of pile length, and two settlement monitoring sections were set up in the adjacent sections to the left and right of the test section. A highprecision monitoring system of 60 static sensors were designed for pile, plate and soil. The variable length pileplate structure in pilesoil interaction and load transfer law during the filling period was analyzed, and the control mechanism of uneven settlement was explained. The results show that the maximum longitudinal slope ratio of transition section is 1.5‰, and the maximum settlement difference at the junction is 1.2 mm. The pore water pressure of the soil under the slab is obviously disturbed during the filling period, and gradually dissipates after 2 to 3 months and tends to the initial value. With the increase of the upper load, the load bearing rate of pipe pile is much faster than that of soil between piles. After the completion of soil consolidation, the pilesoil stress ratio tends to be stable, and the maximum value is 45.86. The bending moment at the center of the four piles is the largest, and there is negative bending moment at the pileplate connection. During the filling process, the lateral displacement caused by soil compression is small, with a maximum of 4.7 mm. The variable length pileplate structure can effectively solve the problem of large settlement difference between road and culvert transition section in soft soil area, and realize the transition from cement mixing pile area with small settlement to pipe pile area with large settlement. This study can provide a basis for the application and promotion of variable length pileplate structure in the transition section. 5 tabs, 16 figs, 23 refs.

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Last Update: 2021-06-04