鉛直群ぐいの荷重〜沈下挙動に関する研究 : その 2. 鉛直載荷試験に関する諸問題

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When vertical loading tests of single piles are conducted following problems should be considered. a) Definitions and interpretations about yielding load or ultimate bearing capacity are not sufficient. b) Differencies of mechanical behaviors characterized by pile materials, methods of setting the piles and scale effects can not be said to be clered up theoretically. c) Problems of technics in loading test using reaction piles or measuring settlements of piles and ground or so. d) Problems about differenceies between mechanical behaviors at loading tests and long term working load. This report deals with these probrems, and three examples (EX. 1, 2, 3) obserbed in siteare picked up here to discuss the applicabilities of author's theory shown in previous report (Part I) to these. Conclusions obtained are as follows. 1) Settlement behavior of driven piles can be recognized to be pure elastic and plastic considering pre-loads during pile driving as history. 2) EX. 1 and 2 are the cases of driven piles. In EX. 1 after R_f (frictional resistance) reached _uR_f (ultimate capacity of R_f) pile tip force can not reach it's ultimate because of it's closed end. But in EX. 2, after R_f reached _uR_f pile tip force soon reaches it's ultimate state because of it's opened end. 3) EX. 3 is the case of cast in place concrete pile. In this case both pile surface and pile tip shows true virgin load-settlement behaviors. Settlement is very large compared with driven piles, but the load-settlement mechanism is similar to that of driven piles. 4) Influences of using reaction piles on loading test data are very large when R_f is smaller than _uR_f.
1978-08-30

鉛直群ぐいの荷重〜沈下挙動に関する研究 : その 2. 鉛直載荷試験に関する諸問題

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