Anchor-SMW Method Pile Composite Foundation Pit Supporting Technology And Its Application Research

With the rapid development of the urban construction, high-risebuildings and underground space exploitation, while the urban buildingsbecome denser and the construction field narrower, the foundation pitconstruction has great influence on the safety of surrounding buildings andmunicipal facilities. And the safety of deep foundation pit construction isoften depending on the foundation pit supporting which has become animportant topic of the civil engineers. Selecting an appropriate foundation pitsupporting scheme among a variety of schemes not only affects the safety offoundation pit engineering and supporting cost, but also has a significantinfluence on the surrounding building environment. The anchor-SMW methodpile composite foundation pit supporting technology among a variety ofschemes is widely used because it has many advantages, such as lower cost,shorter construction period, etc. Therefore, the research of anchor-SMWmethod pile foundation pit supporting technology is of obvious practicalsignificance and application value.This paper introduces comment foundation pit supporting technology,such as soil nail wall, soil-cement gravity retaining wall, diaphragm wall, pilein row retaining wall steel sheet pile, reinforced concrete sheet pile retainingwall, and combines the development status of anchor-SMW method pile. Itintroduces in detail the SMW Method pile and anchor supporting structurecomposition, the construction process, the key link, as well as qualityassurance measures. And it analyzes the limitations of the single SMWmethod pile and single anchor supporting measures, then further studies theanchor-SMW method pile composite foundation pit supporting technology.This paper is based on the engineering examples. It analyzes theadvantages of applying SMW Method pile and anchor composite foundationpit supporting scheme in costal soft soil foundation pit. This supportingscheme has a lot of advantages such as lower cost, shorter construction period, obvious water exclusion effect, safe for surrounding building environment, etc.The paper analyzes in detail the construction methods and quality assurancemeasures of SMW method pile，anchor，earth excavation, and foundation pitdewatering in SMW method pile-anchor composite foundation pit supportingtechnology.Through comparison of the on-site monitoring data, this paper analyzesvariation of top beam horizontal displacement, slope top ground displacementand settlement, building settlement, dam deformation, deep soil horizontaldisplacement (inclination measuring), the supporting component stress,anchor stress, supporting column settlement and horizontal displacement, andgroundwater level. It also studies the monitoring methods of SMW methodpile-anchor composite foundation pit supporting.Finally this paper suggests a prospect of the further unsolved problems inanchor-SMW method pile composite foundation pit supporting technology.