|Table of Contents|

Study on influence of different treatment measures for karst caves on bearing characteristics of pile foundation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2024年04期
Page:
151-158
Research Field:
岩土工程
Publishing date:

Info

Title:
Study on influence of different treatment measures for karst caves on bearing characteristics of pile foundation
Author(s):
FENG Zhongju1;  XU Boxi1;  CHEN Huiyun1;  XIA Chengming2;  CAI Jie3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Sanming Puyan Highway Co. Ltd, Sanming 365000, Fujian, China; 3. Fujian Transportation Construction Quality and Safety Center, Fuzhou 350001, Fujian, China)
Keywords:
geotechnical engineering;  karst area;  pile foundation;  vertical bearing characteristic;  backfilling method;  steel casing follow-up method
PACS:
U443
DOI:
10.19815/j.jace.2022.07011
Abstract:
In order to analyze the influence of different treatment measures of karst caves on the bearing characteristics of pile foundations in karst areas, a coupling model of karst caves-piles-rock and soil was established through numerical simulation. The effects of two different treatment measures backfilling method and steel casing follow-up method on the bearing characteristics of pile foundations were compared and analyzed under the condition of changing the height of karst caves height. The results show that the vertical bearing capacity of pile foundation decreases with the increase of the karst cave height under the two treatment measures. When the height of the karst cave is less than 10 m, the impact of the karst cave treatment measures on the vertical bearing capacity of the pile foundation can be ignored. When the height of the karst cave is greater than 10 m, the impact of treatment measures on the vertical bearing capacity needs to be considered. The axial force of the pile body decreases greatly and the pile side friction resistance increases significantly within the scope of the karst cave treated by the backfilling method, but it is basically unchanged in the karst cave treated by the steel casing follow-up method. Compared with steel casing follow-up method, backfilling method is more conducive to exerting the pile side friction resistance. With the increase of the height of the karst cave, the proportion of pile side friction under the two treatment measures gradually decreases, and the proportion of pile end resistance gradually increases. When the ultimate bearing capacity of the pile foundation is reached, the proportion of pile end resistance of karst cave treated by backfilling method is smaller than that of steel casing follow-up method.

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Last Update: 2024-07-20