紧邻高层建筑深基坑地下连续墙支护效果研究

A dissertation on supporting effect research of underground continuous wall in deep foundation pit close to high-rise building

紧邻高层建筑深基坑开挖要同时保证基坑施工安全及紧邻高层建筑安全使用,对基坑支护结构形式要求较高。结合某市地铁车站工程实例,采用数值模拟和现场测试相结合方法,对车站深基坑采用地下连续墙支护方案控制效果进行综合评估。研究结果表明:车站深基坑采用地下连续墙支护方案后,壁槽及墙体支护结构侧向位移控制在3.5 mm以内,验证了基坑支护效果较高;高层建筑对基坑支护施工安全影响较小,考虑高层建筑荷载条件下连续墙侧向位移仅增加0.2 mm;高层建筑现场测试侧向变形0.9 mm,相对较小,能够满足基坑施工期自身结构安全使用。数值模拟和现场均验证了紧邻高层建筑深基坑地下连续墙支护效果较高,研究成果可为类似工程实践提供一定程度上的参考依据。

Close to the high-rise building deep excavation to ensure the safety of the construction of the pit and close to the safe use of high-rise buildings,the foundation pit support structure requirements are higher. Combined with a city subway station project examples,the use of numerical simulation and field testing combined method,the station deep foundation pit using underground continuous wall support program control effect of comprehensive assessment. The results show that the lateral displacement of the wall and the wall support structure is controlled within 3. 5 m after the underground continuous wall support scheme is used in the deep foundation pit of the station,which proves that the foundation pit support effect is higher; The lateral impact of the continuous wall is only increased by 0. 2 m. The lateral deformation of the high-rise building is 0. 9 mm,which is relatively small,which can meet the safe use of the structure of the foundation pit during the construction period. Both the numerical simulation and the field verify that the supporting effect of the deep continuous wall of the deep foundation pit is high,and the research results can provide some reference for similar engineering practice.