桥梁桩基穿越溶洞的荷载传递机制试验研究

doi:10.16285/j.rsm.2022.0898

Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (5): 1405-1415.doi: 10.16285/j.rsm.2022.0898

• Fundamental Theroy and Experimental Research • Previous Articles Next Articles

Experimental study on load transfer mechanism of bridge pile foundation passing through karst cave

CHEN Hui-yun^{1, 2}, FENG Zhong-ju², BAI Shao-fen², DONG Jian-song³, XIA Cheng-ming⁴, CAI Jie³

1. School of Architecture and Civil Engineering, Xihua University, Chengdu, Sichuan 610039, China; 2. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China; 3. Fujian Transportation Construction Quality and Safety Center, Fuzhou, Fujian 350001, China; 4. Sanming Puyan Highway Co., Ltd., Sanming, Fujian 353000, China

Received:2022-06-13 Accepted:2022-11-16 Online:2023-05-09 Published:2023-04-30
Supported by:
This work was supported by the National Key Research and Development Program of China (2018YFC1504801-04) and Fujian Provincial Transportation Science and Technology Project (2018Y032).

Abstract

Abstract: In order to understand the load transfer mechanism of highway bridge pile foundation passing through karst cave, the field test of bridge pile foundation treated by backfilling method is carried out. Combined with the numerical simulation method, the vertical bearing characteristics and load transfer mechanism of pile foundation passing through karst caves with different heights are studied, and the variation law of the maximum value of the negative skin friction caused by backfilling material in different cave heights and its proportion of distribution range are discussed. The results show that the negative skin friction in the karst area is affected by the type of karst cave, i.e. when the settlement of the soil on the side of the pile of the filled karst cave is smaller, the pile side can provide less positive friction for the pile foundation; when the settlement of the soil of the pile side of the unfilled karst cave is larger, the pile side can produce negative friction. After the karst cave is treated by the backfilling method, the vertical ultimate bearing capacity of the bridge pile foundation passing through the karst cave decreases with the increase of the cave height, e.g. when the cave height increases from 3 m to 12 m, the distribution range of the negative skin friction corresponding to the vertical ultimate bearing capacity of pile foundation increases from 0% to 27.14%. It is suggested that in the actual design, when the backfilling method is used to deal with the karst cave, the influence of the negative skin friction caused by the pile foundation passing through the karst cave on the vertical bearing characteristics of the pile foundation should be considered. When the height of karst cave is 3–12 m, the bearing capacity of the pile foundation should be calculated according to negative skin friction in the ranges of 0, 0.106H, 0.214H and 0.271H (H is the cave height) below the top surface of karst cave, so as to ensure the bearing safety of bridge pile foundation during the consolidation and settlement of backfill materials after cave treatment.

Key words: bridge engineering, karst cave, load transfer mechanism of pile foundation, field test, negative friction

CLC Number:

TU 473

CHEN Hui-yun, FENG Zhong-ju, BAI Shao-fen, DONG Jian-song, XIA Cheng-ming, CAI Jie, . Experimental study on load transfer mechanism of bridge pile foundation passing through karst cave[J].Rock and Soil Mechanics, 2023, 44(5): 1405-1415.

References

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