CAJ | 학술논문

对某回填土场地基坑施工中支护结构顶部水平位移、沉降和深层土体水平位移的监测数据进行了系统分析。监测结果表明：基坑边坡顶部水平位移不仅与开挖深度有关，还与基坑的平面形状和土层条件密切相关；阳角处的位移大于阴角处，长边跨中的位移明显；开挖对沉降的影响较水平位移的大；在相同支护条件下，回填土区域顶部的沉降差异较大；80％的水平位移发生在填土层；填土层与原土层交界面处的整体性差，导致上部支护结构整体向基坑内侧滑移，引发基坑顶部附近地面的拉裂；基坑变形对降雨因素比较敏感，基坑支护设计应考虑降雨对支护结构的不利影响。基坑开挖过程中的及时监测预警及应急措施，确保了基坑工程的安全。
대모회전토장지기갱시공중지호결구정부수평위이、침강화심층토체수평위이적감측수거진행료계통분석。감측결과표명：기갱변파정부수평위이불부여개알심도유관，환여기갱적평면형상화토층조건밀절상관；양각처적위이대우음각처，장변과중적위이명현；개알대침강적영향교수평위이적대；재상동지호조건하，회전토구역정부적침강차이교대；80％적수평위이발생재전토층；전토층여원토층교계면처적정체성차，도치상부지호결구정체향기갱내측활이，인발기갱정부부근지면적랍렬；기갱변형대강우인소비교민감，기갱지호설계응고필강우대지호결구적불리영향。기갱개알과정중적급시감측예경급응급조시，학보료기갱공정적안전。
The system analysis is done on monitoring data of a deep excavation in backfill site , including hori-zontal displacement and settlement at the top of supporting structure and horizontal displacement of deep stra-tum.It is shown that the horizontal displacement is closely related to the excavating depth , and effected obvi-ously by the plane shape and soil conditions of pit .The top horizontal displacement of the excavation is larger in the positive corner than that in the negative corner.Displacement is obvious in the middle of long sides.Com-pared to the horizontal displacement, the settlement of soil is greater by the excavating effects.The settlement was clearly different at various regions of backfill area even if the supporting measures are identical .The moni-toring results show that 80% of the horizontal displacement occurred in back fill course .The integrity of the in-terface between the backfill soil and the original soil is poor , and causes the upper part of the supporting struc-ture slipped wholely to the inside of the pit.Furthermore, the ground near the top of the pit will crack.The deformation of the whole excavation areas is sensitive to rainfall.Hence, the adverse impact of rainfall on the supporting structure should be considered during the designing work .Since emergency measures adopted once the monitoring alarms reported , the pit safety is ensured.