Application of bi-directional static loading test to deep foundations  

作　　者：Guoliang Dai Weiming Gong 

机构地区：[1]School of Civil Engineering, Southeast University, Nanjing, 210096, China [2]Key Laboratory for RC and PRC Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2012年第3期269-275,共7页岩石力学与岩土工程学报(英文版)

基　　金：Supported by the National Natural Science Foundation of China (50908048);the Priority Academic Program Development (PAPD) Project of JiangsuHigher Education Institutions

摘　　要：Bi-directional static loading test adopting load cells is widely used around the world at present, with increase in diameter and length of deep foundations. In this paper, a new simple conversion method to predict the equivalent pile head load-settlement curve considering elastic shortening of deep foundation was put forward according to the load transfer mechanism. The proposed conversion method was applied to root caisson foundation in a bridge and to large diameter pipe piles in a sea wind power plant. Some new load cells, test procedure, and construction technology were adopted based on the applications to different deep foundations, which could enlarge the application scopes of bi-directional loading test. A new type of bi-directional loading test for pipe pile was conducted, in which the load cell was installed and loaded after the pipe pile with special connector has been set up. Unlike the conventional bi-directional loading test, the load cell can be reused and shows an evident economic benefit.Bi-directional static loading test adopting load cells is widely used around the world at present, with increase in diameter and length of deep foundations. In this paper, a new simple conversion method to predict the equivalent pile head load-settlement curve considering elastic shortening of deep foundation was put forward according to the load transfer mechanism. The proposed conversion method was applied to root caisson foundation in a bridge and to large diameter pipe piles in a sea wind power plant. Some new load cells, test procedure, and construction technology were adopted based on the applications to different deep foundations, which could enlarge the application scopes of bi-directional loading test. A new type of bi-directional loading test for pipe pile was conducted, in which the load cell was installed and loaded after the pipe pile with special connector has been set up. Unlike the conventional bi-directional loading test, the load cell can be reused and shows an evident economic benefit.

关 键 词：deep foundations bi-directional static loading test root caisson foundation large diameter pipe pile 

分 类 号：TU473.1[建筑科学—结构工程]