CAJ | 학술논문

以舟山沈家门港海底沉管隧道为原型，取纵向30 m建立1∶10缩尺寸模型，试验模拟了海水环境下注砂基础层的形成过程，采用水荷载来模拟均匀分布的施工荷载，研究碎石层、砂垫层、砂石混合基础层、存在回淤的砂石混合基础层的压缩过程和压缩模量Es，对比分析差异和原因。研究结果表明：施工期间基础层沉降随时间基本呈线性变化，单独碎石基础层、注砂法形成的密实砂盘、砂石复合基础层和大量回淤条件下砂石混合基础层的平均压缩模量Es分别为0.67，0.80，3.26和1.85 MPa，各工况沉降量的大小与基础层密实度有很大关系；施工过程中砂石的相互作用能大大增加整体的压缩模量，约4.4倍于无相互作用影响的理论组合，而回淤则会削弱此影响，大大减小压缩模量。
이주산침가문항해저침관수도위원형，취종향30 m건립1∶10축척촌모형，시험모의료해수배경하주사기출층적형성과정，채용수하재래모의균균분포적시공하재，연구쇄석층、사점층、사석혼합기출층、존재회어적사석혼합기출층적압축과정화압축모량Es，대비분석차이화원인。연구결과표명：시공기간기출층침강수시간기본정선성변화，단독쇄석기출층、주사법형성적밀실사반、사석복합기출층화대량회어조건하사석혼합기출층적평균압축모량Es분별위0.67，0.80，3.26화1.85 MPa，각공황침강량적대소여기출층밀실도유흔대관계；시공과정중사석적상호작용능대대증가정체적압축모량，약4.4배우무상호작용영향적이론조합，이회어칙회삭약차영향，대대감소압축모량。
Based on the prototype of Zhoushan Shenjiamen Port immersed tube tunnel,a 1∶10 scale shrinkage model test is established in longitudinal of 30 m. The test simulates the uniform distribution construction load through the water load and focuses on the formation process of sand base layer in marine environment to study the compression process and compression modulusEs of four kinds of base layer which is composed by gravel,sand, sand and gravel mixed,sand and gravel mixed with lots of silting,and the difference is compared and analyzed. The results show that,base layer construction settlement is integrally in the linear elastic stage,and the compression modulusEs of four kinds of base layer are respectively 0.67,0.80,3.26,1.85 MPa in average which have a lot to do with the base layer density. Interaction of sand and gravel during the base layer construction will greatly increase the compression modulus,which is about 4.4 times of the mixed condition without interaction in theory. The back-silting can weaken this influence and will greatly decrease the compression modulus.