목차

Ⅰ. 서 론 ···························································································· 1
1.1 연구 배경 ················································································ 1
1.2 연구 목적 ················································································ 3
1.3 연구내용 및 범위 ·································································· 5
Ⅱ. 연구사 ························································································· 8
2.1 모래-세립분 혼합토의 압축특성 ········································ 8
2.2 모래-세립분 혼합토의 강도특성 ······································ 11
Ⅲ. 이론적 고찰 ·············································································· 15
3.1 세립질 모래의 구조적 특성 ··············································· 15
3.2 세립질 모래의 역학적 특성 ··············································· 20
3.3 세립질 모래의 압밀 특성 ··················································· 22
Ⅳ. 재료 및 방법 ············································································ 24
4.1 시험 개요 ············································································· 24
4.2 시험재료 및 조건 ································································ 25
4.2.1 재료 선정 ········································································ 25
4.2.2 모래-세립분 혼합비 ······················································ 30
4.3 시험 방법 ·············································································· 31
4.3.1 공시체 제조 ···································································· 31
4.3.2 표준압밀시험 ································································· 34
4.3.3 삼축압축시험 ································································· 36
4.4 수치해석을 통한 압밀침하 특성 ······································· 41
4.4.1 개요 ················································································· 41
4.4.2 적용 이론 ······································································· 42
4.4.3 수치해석 방법 및 입력정수 ········································ 56
4.5 현장 계측결과를 이용한 압밀대상층 적용성 평가 ········ 62
4.5.1 개요 ················································································· 62
4.5.2 연약지반 현황 ································································ 64
4.5.3 연약지반 총 침하량 산정방법 ····································· 65
Ⅴ. 결과 및 고찰 ············································································ 68
5.1 물리적 특성 ·········································································· 68
5.1.1 입도분석 시험 ································································ 68
5.1.2 비중 시험 ········································································ 70
5.1.3 애터버그(Atterberg) 한계 시험 ·································· 71
5.1.4 혼합토의 구조적 특성 ·················································· 76
5.2 압축 및 투수특성 ································································ 78
5.2.1 압축특성 ········································································· 78
5.2.2 압밀 및 투수특성 ·························································· 83
5.3 응력-변형 특성 ···································································· 86
5.3.1 응력-변형율 특성 ·························································· 86
5.3.2 간극수압-변형율 특성 ················································ 102
5.3.3 응력경로 및 강도정수 ················································ 118
5.3.4 고찰 ··············································································· 128
5.4 수치해석 결과 분석 ·························································· 132
5.4.1 압밀이론별 결과 분석 ················································ 132
5.4.2 압밀해석 결과 고찰 ···················································· 161
5.5 SM, SC의 압밀대상층 적용성 ········································ 163
5.5.1 현장 연약지반 계측 결과 분석 ·································· 163
5.5.2 압밀대상층 적용성 평가 결과 ··································· 168
Ⅵ. 결 론························································································· 172
참고 문헌························································································ 175
Abstract ························································································ 182