Study Of Soil And Rock Combination Foundation Pit Monitoring And Regularity Of Excavation Deformation

With the rapid development of China’s national economy, accelerate the pace of city construction, only the development and utilization of the space on the ground has been unable to meet the needs of existing facilities, at the same time, because of the large-scale construction of high-rise building, underground parking field and underground pipelines and other public facilities, city land increasingly nervous. Therefore, many new projects are in the city’s downtown area, building around foundation pit, an important city roads and underground pipelines dense, the attendant appeared a lot of deep foundation pit design and construction issues, such as the retaining structure of foundation pit deformation and stabilization of excavation on the surrounding environment, the influence of excavation, internal and external groundwater controlling and monitoring of foundation pit problems. Therefore, the research on the stability of problems in foundation pit engineering becomes the key problem in geotechnical engineering field urgent.There is a great difference between soil and rock combination of foundation pit and rock or soil foundation, now there is no domestic and foreign mature calculation method, its theoretical research lags far behind the engineering practice, and the existing research results in the deformation of soil and rock excavation engineering of Hengyang red sandstone area is not particularly detailed argumentation, makes a lot of engineering there is no experience to follow. In this paper, a rock foundation pit in Hengyang area with as the basis, adopts the method of theoretical analysis and field measurement, analysis and Research on the deformation law of the foundation pit, the main contents are as follows:1, In detail elaborated and problems of soil and rock in deep foundation pit, foundation and soil and rock combination based on the current study on foundation pit design and monitoring;2, Using proven more economic and reasonable soil and rock foundation pit support design calculation combined with several supporting methods, analysis methods and stability analysis of foundation pit deformation mode of rock soil binding factors, mainly expounds the effects of soil foundation deformation and its influence factors of the similarities and differences, and how to ensure the quality of foundation excavation and puts forward some suggestions.3, Details of the monitoring method, the foundation pit of the layout of monitoring points, and for each different segment monitoring points were arranged through the reasonable layout of monitoring points, monitoring the quality of research how to ensure a reliable and reasonable. The monitoring data obtained by scientific analysis, especially for cable tension of slope and settlement of horizontal and vertical displacement and horizontal displacement of deep soil, surrounding buildings analysis, grasp the deformation rules of the monitoring element in the process of construction, and make timely adjustments to make the foundation to carry on smoothly.4, Through the analysis of the monitoring data, to verify the design of the supporting structure of the rationality, safety; the study concluded that the rock soil binding foundation pit deformation law, through each of the supporting segment cross comparison and analysis, found its differences with the soil of the foundation pit, and the factors affecting the deformation of foundation pit. Provide the basis for the design and construction of foundation pit.