摘要
软土基坑通常采用地下连续墙、CSM搅拌墙、SMW工法桩、灌注桩、钢板桩、土钉墙等支护方式,支护材料与构件造价较高。考虑到杉木杆具有易于取材、价格低廉、绿色环保、耐腐蚀性强、施工便利等优点,尝试将其代替土钉应用于软土基坑支护,对杉木杆原材进行抗拉强度测试,并对其极限抗拔承载力进行检测,根据测试和检测结果选取合理的参数进行设计及稳定性计算,并在青岛某软土场地进行了现场试验及基坑监测。现场试验及基坑监测结果表明,杉木杆可以作为土钉使用,参照土钉墙相关计算模型进行设计和稳定性计算,提高基坑的稳定性,减小放坡占用空间,减少基坑开挖和回填土方量,进而降低施工造价,具有较好的推广应用价值。
Underground diaphragm wall,CSM mixing wall,SMW construction method,cast-in-place pile,steel sheet pile,soil nailing wall and other support methods are often used in soft soil foundation excavation,which is very expensive.Chinese fir poles are readily available with low price and envrionment friendly,and have the advantages of strong corrosion resistance and convenience in construction.the tensile strength and the ultimate uplift bearing capacity of raw materials of Chinese fir pole were tested.According to the test results,reasonable parameters were selected for design and stability calculation,and the field test and foundation pit monitoring were carried out in a soft soil site in Qingdao.The field test and foundation pit monitoring results show that the Chinese fir pole can be used as soil nail.The design and stability calculation could be carried out according to the relevant calculation model of soil nail wall.It could improve the stability of foundation pit,reduce the space occupied by slope,reduce the excavation and backfilling earthwork of foundation pit,and then reduce the construction cost.It has good application value.
作者
李小龙
Li Xiaolong(Qingdao Geological Exploration Institute of China Metallurgical Geology Bureau,Qingdao 266109,Shangdong,China)
出处
《岩土工程技术》
2023年第2期154-160,共7页
Geotechnical Engineering Technique
基金
中国冶金地质总局山东局科研基金(SDYJ-KY202110)。
关键词
软土
杉木杆
基坑工程
基坑监测
soft soil
Chinese fir pole
foundation excavation
monitoring of excavation
