Prestressed Carbon Fiber Constraints Embankment Slope And Settlement Of New Technologies

In order to solve problems that frequently happen in today's construction of expressway, such as excessive or asymmetrical settlement, poor side slope stability, a research project on the application of prestressed carbon fiber to control high fill settlement and improve side slope stability is carried out. This is the first time to apply prestressed carbon fiber to roadbed engineer in the world. The high tensile strength and corrosion-resisting property of prestressed carbon fiber make it possible that the soil is in triaxial state of stress. Therefore, the embankment fill can be compacted, the settlement can be reduced and side slope stability can be improved.In this thesis, experiment on material and anchorage-tension system are first introduced. Comparing the tension test results of a series of carbon fiber products, the one with the best price-performance ratio is picked out among them to be used in the field experiment. The corresponding epoxy resin binder both and anchorage-tension system are also developed.Then the rational construction procedure of CFRP restrain fill is proposed based on field tests of experimental road in the thesis. The data captured in field tests and observations both prove that crossrange prestressing can effectively reduce roadbed settlement, shorten the roadbed compression and stabilization period, and increase the capacity of roadbed.Working mechanism of prestressing CFRP restrain fill has been analyzed comprehensively in the paper, moreover which also been proved in theory that crossrange prestressing can raise the strength of load-bearing and shock, enhance the shear resistance.Another focal point of the thesis is the stabilization analysis of prestressing CFRP restrain fill. In order to analyze the stabilization of slope, Swedish slice method has been improved. Earth pressure distribution back of wall has a bearing on tensile force calculation of CFRP belt. Through analyzing and comparing several calculation methods, one kind is be recommended at last.