CAJ | 학술논문

通过对市政综合管廊基坑开挖的全程监测，结合管廊基坑的特点，分析基坑的水平位移变形、轴力、水位变化和周围地表沉降。研究结果表明以下几点：SMW工法支护下管廊基坑土体变形呈现出“两端小，中间凸”的特点，基坑变形主要出现在开挖过程中；“先撑后挖”会减小土体的变形量；坑外周围土体沉降随基坑开挖先剧烈下降，待基坑开挖到底后，逐渐趋于平缓；基坑在开挖和架设钢支撑时会导致支撑轴力大小浮动，为了确保基坑稳定，水位的监测是基坑监测中必不可少的环节。监测结果可为类似的综合管廊基坑的施工提供参考。
통과대시정종합관랑기갱개알적전정감측，결합관랑기갱적특점，분석기갱적수평위이변형、축력、수위변화화주위지표침강。연구결과표명이하궤점：SMW공법지호하관랑기갱토체변형정현출“량단소，중간철”적특점，기갱변형주요출현재개알과정중；“선탱후알”회감소토체적변형량；갱외주위토체침강수기갱개알선극렬하강，대기갱개알도저후，축점추우평완；기갱재개알화가설강지탱시회도치지탱축력대소부동，위료학보기갱은정，수위적감측시기갱감측중필불가소적배절。감측결과가위유사적종합관랑기갱적시공제공삼고。
Through the whole monitoring process of the excavation of the municipal utility tunnel pit and coupled with the study of the feature of the utility tunnel pit,the horizontal displacement,axial forces of support,changes of water level and the surrounding surface subsidence of the pit are thoroughly analyzed. The results show as follows. Due to the support of SMW,the soil deformation increases first then decreases with depth,the most of the pit deformation appear in the process of excavation. The soil deformation will be reduced when the pit are supported before the excavation. The surrounding surface of the pit subsides sharply in the beginning of the excavation,and it becomes smooth gradually with the process of the excavation. The axial forces of support varies in the process of excavation. In this case,water level monitoring is essential link in foundation pit monitoring to guarantee the stability of foundation pit. In this paper,the monitoring results will provide the reference for the similar construction of the municipal utility tunnel.