锚杆-SMW工法桩复合基坑支护技术及其应用研究

发布时间：2018-10-05 07:59

【摘要】：随着城市建设的高速发展，高耸建筑和地下空间开发不断涌现，同时，由于城市建筑密集、施工用地狭窄，基坑施工对周边建筑及市政设施的安全影响甚大，而深基坑施工安全又往往取决于基坑支护，因此，基坑支护成为土木工程界研究的一个重要课题。基坑工程的支护方法多种多样，基坑支护方案是否合理，不仅影响着基坑工程的安全和支护工程的造价，而且还会对工程周边的建筑环境产生重大的影响。在众多的基坑支护方法中，，锚杆--SMW工法桩复合基坑支护技术由于具有造价较低、基坑施工工期较短等优点而得到广泛应用，因此，锚杆--SMW工法桩复合基坑支护技术研究具有明显的现实意义和应用价值。本文研究了土钉墙、水泥土重力式围护墙、地下连续墙、排桩围护墙、钢板桩围护墙、钢筋混凝土板桩围护墙等常见基坑支护技术，并结合SMW工法桩和锚杆的发展现状，详细介绍SMW工法桩和锚杆的结构组成、施工工序、关键环节以及质量保障措施。并分析了单一的SMW工法桩和单一锚杆支护措施的局限性，对锚杆--SMW工法桩复合的基坑支护技术进行了深入研究。本文结合工程实例，分析在沿海软土基坑中，采用SMW工法桩与扩孔锚索复合基坑支护方案的优势，该支护方案具有基坑支护费用较低、基坑施工周期短、基坑隔水效果明显、能确保周边建筑环境安全等优点。文章详细研究了SMW工法桩与扩孔锚索复合基坑支护技术中SMW工法桩、扩孔锚索、土方开挖及基坑降水的施工方法与质量保障措施。文章通过对现场监测数据的比较，分析了冠梁水平位移、坡顶地面水平位移和沉降、建筑物沉降、堤坝变形、土体深层水平位移（测斜）、支撑构件应力、锚杆应力、支承柱沉降和水平位移、地下水位的变化规律，对SMW工法桩与扩孔锚索复合基坑支护的监测方法进行了研究。文章最后还对锚杆--SMW工法桩复合基坑支护技术需要进一步解决的问题提出了展望。
[Abstract]:With the rapid development of urban construction, the development of towering buildings and underground space is constantly emerging. At the same time, because of the dense urban buildings and narrow construction land, foundation pit construction has a great impact on the safety of surrounding buildings and municipal facilities. However, the safety of deep foundation pit construction often depends on the foundation pit support, so foundation pit support has become an important subject in the field of civil engineering. There are a variety of supporting methods in foundation pit engineering. Whether the supporting scheme of foundation pit is reasonable or not only affects the safety of foundation pit engineering and the cost of supporting engineering, but also has a significant impact on the surrounding building environment. Among the many foundation pit supporting methods, the bolt-SMW pile composite foundation pit support technology has been widely used because of its advantages of low cost, short foundation pit construction period and so on. The research of anchor-SMW pile composite foundation pit support technology has obvious practical significance and application value. In this paper, the common foundation pit supporting techniques, such as soil nailing wall, cement soil gravity retaining wall, underground continuous wall, row pile retaining wall, steel sheet pile retaining wall, reinforced concrete sheet pile retaining wall, and so on, are studied, and the development status of SMW pile and anchor rod are combined. The structure composition, construction procedure, key links and quality assurance measures of SMW pile and anchor rod are introduced in detail. The limitations of single SMW pile and single bolt supporting method are analyzed. Combined with engineering examples, this paper analyzes the advantages of using SMW pile and reaming anchor cable composite foundation pit support scheme in coastal soft soil foundation pit. The support scheme has the advantages of low foundation pit support cost, short foundation pit construction period, and obvious water insulation effect of foundation pit. Can ensure the surrounding building environment safety and other advantages. In this paper, the construction methods and quality assurance measures of SMW pile and reaming anchor cable composite foundation pit supporting technology are studied in detail, such as SMW pile, reaming anchor cable, earthwork excavation and foundation pit dewatering. Through the comparison of field monitoring data, this paper analyzes the horizontal displacement of crown beam, horizontal displacement and settlement of slope top, settlement of buildings, deformation of embankment, horizontal displacement of deep soil (measuring slope), stress of supporting member, stress of anchor rod, etc. The monitoring method of composite foundation pit support with SMW pile and reaming anchor cable is studied on the basis of settlement and horizontal displacement of supporting column and variation of groundwater level. At the end of the paper, the problems that need to be solved further in support technology of SMW pile composite foundation pit are prospected.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753

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