A Study on the Creep Behavior of Tuff and Sensitivity Analysis

Gyoungman Kim; So-Keul Chung; Chan Park; Yong-Bok Jung; Donghui Kim; Hwanjo Baek

doi:10.12972/ksmer.2017.54.1.029

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2017 Vol.54, Issue 1 Preview Page Next Page

Research Paper

A Study on the Creep Behavior of Tuff and Sensitivity Analysis 응회암의 크립 거동 및 민감도 분석 연구

28 February 2017. pp. 29-38

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Abstract

In the present study, uniaxial creep tests were conducted on tuff specimens and the parameters of rheological models derived from the results of the tests. In order to assess the time-dependent displacement on the roof of unsupported circle tunnel, numerical modeling was carried out. The displacement of 1.46 mm was taken from the elastoplastic analysis. On the contrary, the displacement obtained from creep analysis was increased by 39 mm. It doses highlight the fact that it is important to consider the creep behavior of soft rock mass when underground structures and rock slope were designed. Finally, a sensitivity analysis method was introduced that is useful for assessments on the sensitivity of parameters in systematic approaches and the sensitivity analysis was conducted to evaluate the effects of Burgers model parameters on displacement.

Keywords

Creep test

Burgers model

Sensitivity analysis

본 연구에서는 응회암을 대상으로 크립 시험을 수행하였고, 유변학적 모델을 결정하였다. 또한 수치해석을 통해 무지보 공동의 천반부에 발생하는 시간 의존적 변위를 확인하였다. 탄소성 해석 시 천반부에 나타난 변위는 1.46 mm으로 확인되었으나, 한 달 동안의 크립 거동 해석 결과 변위는 39 mm 까지 증가하였다. 이 결과는 연약암반에서는 암반구조물 설계 시 암반의 크립 거동을 고려하는 것이 중요하다는 것을 말해준다. 마지막으로 각 요인의 민감도를 정량적으로 나타낼 수 있는 민감도 분석 방법을 소개하고 이를 통해 특정 조건하에서 Burgers 모델의 매개변수가 변위에 미치는 영향을 평가하고자 민감도 분석을 수행하였다.

키워드

크립 시험

버거 모델

민감도 분석

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 54
No :1
Pages :29-38
Received Date : 2016-12-15
Revised Date : 2017-02-20
Accepted Date : 2017-02-24
DOI :https://doi.org/10.12972/ksmer.2017.54.1.029

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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