| In recent years, the design key of foundation pit engineering, from the simple to prevent the instability and failure of the foundation pit engineering, transferred to the surrounding environment and the influence of surrounding buildings and the adjacent plot on the protection of underground space gradually. Recyclable anchor as a new type of foundation pit retaining structures, note only can be completed in effective cases, but also pay attention to the protection of adjacent underground space and avoid the use of anchor cable caused the adjacent block the invasion of the underground space of construction problems and social contradictions, at the same time overcome problem that the brace support system of high cost, long construction period and construction inconvenience to consteuction. In this paper, the main contents of the following aspects to study and analysis of recyclable anchor:First, this paper introduces the situation of research and application of recyclable anchor, and to support the retaining structures and supporting technology from the angle of economy and construction period do contrast analysis, and comparative analysis of the traditional anchor cable from the angle of safety and environmental protection from different angles expounds the advantages and characteristics of recycled anchor cable.Second, recyclable cable is belong to analyze the pressure form anchor cable internal force calculation, the anchor sets up mathematical model of determining the factors that affect the bearing capacity of anchor rope pulling, rock and soil body poisson’s ratio,friction Angle, the anchoring and grouting body diameter and the ratio of the elastic modulus of rock and soil mass, etc., its degree of impact on the internal forces of the anchor in order increase, and has a certain regularity.Third, establish a recyclable anchor single anchor finite element model, analysis of anchor in internal force change and the influence factors in the process of excavation, and do comparison and predecessors’ studying results, some research and construction of significant conclusions for the future.Fourth, on the basis of above research, in view of the recoverable anchor cable with oblique rotary jet mixing stiffening pile technology, the high pressure jet grouting anchor recycled existence of the anchoring end cement-soil compressive strength problems were analyzed, and concluded that the anchorage section of cement-soil damage strength curve,provide reference and design basis for subsequent projects.Finally, combined with a certain foundation pit project, high pressure jet grouting anchor foundation pit parts adopt recycling technology for support, according to the actual monitoring data, analysis of research results, verify the feasibility and correctness of the analysis and calculation results. |
