滨海基坑穿越软土压力型锚杆现场试验研究  

In-situ Test Study on Pressured Anchor through Soft Soil in Coastal Foundation Pit

作　　者：李鹏 曲立清 王宇 王殿斌 聂宁 Li Peng;Qu Liqing;Wang Yu;Wang Dianbin;Nie Ning(Qingdao Surveying&Mapping Institute,Qingdao 266032,Shandong,China;Qingdao Geotechnical Engineering Research Cen-ter,Qingdao 266032,Shandong,China;Qingdao Guoxin Development Group Co.,Ltd.,Qingdao 266071,Shandong,China)

机构地区：[1]青岛市勘察测绘研究院,山东青岛266032 [2]青岛岩土工程技术研究中心,山东青岛266032 [3]青岛国信发展(集团)有限责任公司,山东青岛266071

出　　处：《岩土工程技术》2023年第1期89-94,共6页Geotechnical Engineering Technique

摘　　要：青岛胶州湾北岸广泛分布厚层海相沼泽化软黏土,为研究穿越厚层软土时压力型锚杆的适用性,开展了压力分散型锚杆、拉力型锚杆和承压型囊式扩体锚杆的现场对比试验。试验结果表明,压力分散型和承压型囊式扩体锚杆极限承载力离散性较大,难以满足锚杆验收标准;相对于极限粘结强度和局部受压承载力,锚杆成孔曲率导致的锚固体整体失稳可能是穿越厚层软土的压力型锚杆极限承载力不足的主要原因;对滨海基坑工程中穿越软土的预应力锚杆,建议优先采用拉力型锚杆。Thick marine marshy soft clay are widely distributed in the north shore of Qingdao Jiaozhou Bay.To study the applicability of pressured anchor through the thick soft soil,in-situ comparative tests about pressure-dispersive anchor,tensioned anchor and capsule type pressured expanding anchor were carried out.The test results show that the ultimate bearing capacity of pressure-dispersive anchor and capsule type pressured expanding anchor is less than acceptance standard value.Relative to the ultimate bonding strength and the local bearing capacity,the overall instability of anchorage body caused by the bending of anchor during hole formation may be the main reason for the insufficient ultimate bearing capacity of pressured anchor through soft soil.It is suggested that tensioned anchor should be used first for the prestressed anchor crossing soft soil in coastal foundation pit engineering.

关 键 词：压力型锚杆 拉力型锚杆 扩体锚杆 软土 现场试验 

分 类 号：TU447[建筑科学—岩土工程] TU413[建筑科学—土工工程]