서지주요정보
피에조 콘 소산시험을 이용한 연약지반의 신뢰성 있는 압밀특성 추정 = Reliable estimation of consolidation characteristics of soft-deposit by piezocone dissipation test
서명 / 저자 피에조 콘 소산시험을 이용한 연약지반의 신뢰성 있는 압밀특성 추정 = Reliable estimation of consolidation characteristics of soft-deposit by piezocone dissipation test / 김영상.
저자명 김영상 ; Kim, Young-Sang
발행사항 [대전 : 한국과학기술원, 1999].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8009462

소장위치/청구기호

학술문화관(문화관) 보존서고

DCE 99003

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

For normally consolidated clay, several researchers have developed a number of theoretical time factors to determine the coefficient of consolidation from piezocone test results. However, depending on assumptions and analytical techniques, it could vary considerably, even for a specific degree of consolidation. Furthermore, the coefficient of consolidation determined by the common methods makes the back-calculated dissipation curve to match the measured dissipation curve only at 50% degree of dissipation. Therefore, it inevitably overestimates and underestimates pore pressures at low degree of dissipation and high degree of dissipation, respectively. Hence, such methods cause some troubles in predicting the long-term behavior of in-situ soft deposits by a linear consolidation theory with the predicted coefficient of consolidation. In this dissertation, a new method is proposed to determine a consistent coefficient of consolidation by applying the concept of an optimum design technique over input degree of dissipation range. Initial excess pore pressure distribution is assumed to be capable of being obtained by the successive spherical cavity expansion theory. The dissipation of pore pressure is simulated by means of a two-dimensional linear-uncoupled axi-symmetric consolidation analysis. The minimization of objective function which is defined by differences between measured and predicted excess pore pressures was carried out by the BFGS unconstrained optimum design algorithm with a one-dimensional golden section search technique. By analyzing numerical example and practical dissipation test results, it was found that the adopted optimum design technique gives consistent results at various degrees of dissipation and convergent results over 40 ~ 50% degree of dissipation irrespective of the input degree of dissipation. And the predicted pore pressure dissipation curve matches well with the measured one over the entire dissipation range. Based on the results that the coefficient of consolidation could be reasonably estimated by the optimization technique, it is also tried to predict more realistic excess pore pressure at high degree of dissipation. Applied to some real examples, it can be shown that the excess pore water pressure at high degree of dissipation can be well predicted if the proposed method uses the input dissipation data up to around 50% degree of dissipation. And hence it is expected that the proposed prediction method saves time and expenses in conducting the field dissipation test.

서지기타정보

서지기타정보
청구기호 {DCE 99003
형태사항 [x], 169 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Sang Kim
지도교수의 한글표기 : 이승래
지도교수의 영문표기 : Seung-Rae Lee
학위논문 학위논문(박사) - 한국과학기술원 : 토목공학과,
서지주기 참고문헌 : p. 160-169
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