Study On Mechanism Of Recoverable Prestressed Anchorage Cable And Mechanical Analysis Of Construction

As the further development of the city , foundation works have increased drastically, prestressed anchorage cable supporting structure also has been widely used. But as a temporary supporting measure, anchorage cable can not be remove from the underground forever. That's lead to an enormous waste and long-term occupation of underground space. Those underground waste caused great negative to the utilization of surrounding underground space. But recoverable prestressed anchorage cable technology can solve this problem easily. It's not only can be reused in order to reduce the cost and, more importantly, it can slove the problem of underground waste caused by the temporary supporting structure. So recoverable technology have broad and far-reaching significance for underground space development and utilization.This paper based on the parking lot deep foundation pit excavation project of xiyan part of shenzhen metro line 3. Used numerical simulation,mathematical analysis and mechanical analysis method to study the new anchorage cable. It's contain the mechanism of anchoring and reinforcing,the mechanism of mechanical transmission,the method of numerical simulation,the method of design and the scheme of recovery construction about this anchorage cable. And I hope this paper could provide a useful reference for Similar studies in the furure.First of all, I studied the numerical simulation method of prestressed anchorage cable and summarized the numerical simulation method in FLAC3D. And then used the mechanical analysis and numerical simulation method to comparative analysis the mechanism of anchoring and reinforcing and the mechanism of mechanical of common anchorage cable and recoverable anchorage cable. And proved that recoverable anchorage cable is more ascendant than common anchorage cable.Used the elasticity method to study the mechanism of mechanical transmission on anchorage zones. Deriving interfacial stresses formula on anchorage zones of pressure force concentrated anchorage cable form the Mindlin solution. And the distribution of interfacial stresses,the influence factors and the max of stress,the effective bonding length were discussed.Thirdly, discussed the design method of common anchorage cable and recoverable anchorage cable. And then, given a new design method called effective length method which was based on the distribution of interfacial stresses.Finally, studied on the scheme of anchorage cable recovery construction. Discussed the influence for the cable-anchored pile after the anchorage cable were removed. And find out a safe and reasonable recovery construction scheme. In this project, we given 5 schemes which is contain the top-down and the down-top method. Using the FLAC3D to set up the mechanical model and analysis the Stable of the cable-anchored pile structure.