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Research on Analysis of the Steel Liner to the Deep Outlet’s Orifice Stress in Concrete Dam

Author: LiLinFeng
Tutor: YeLin
School: Xi'an University of Technology
Course: Hydraulic Structure Engineering
Keywords: Draining deep hole Submodel method Steel liner Orifice stress Three - dimensional finite element
CLC: TV135.2
Type: Master's thesis
Year: 2010
Downloads: 41
Quote: 0
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Abstract


With the development of market economy , increasing energy demand , China is to build a number of giant hydropower trend to the dams and large reservoirs . For larger discharge volume of the dam project , set up large orifice spillway dam body has significant advantages , more and more high dam the scuppers spillway dam . In general , due to the high head , concrete high dam deep hole (bottom ) velocity , and therefore need to be arranged scuppers runner steel liner . Given the deep ( bottom ) hole design conditions of use of the steel liner , the the steel liner 's main role is to prevent the erosion of the high-speed flow convection Road , abrasion and prevent seepage of the dam structure to produce hydraulic fracturing . Research scuppers runner whether the steel liner and different steel liner thickness orifice stress necessary . Firstly limited Motoko model validation analysis , calculation results show that , the submodel analysis orifice stress not only to meet the computational accuracy , and can greatly reduce the computational workload to reduce the calculation of the time it takes to save computer memory . Therefore, the the submodel law is an effective way to solve the draining orifice stress analysis . Papers using this method , and taking into account the effect of concrete and steel contact , finite element calculation of the the draining deep hole of a high arch , mainly a deep hole runner with or without the steel liner and different steel liner thickness , pore sidewalls the top and bottom plates , as well as on the the downstream cantilever structure of stress state influence . The results showed that the scuppers steel liner than no steel lined , a side wall of the flow channel on the downstream end of the tensile stress is significantly reduced, the tensile stress of the bottom plate and the top plate of the flow channel has been reduced ; as the plate thickness increases , the flow path side the wall of the downstream end of the tensile stress is gradually reduced , and the tensile stress of the bottom plate and the top plate of the flow channel also been reduced ; scuppers changes in the thickness of the presence or absence of the steel liner and steel liner does not substantially affect the stress state of the cantilever structure of the Preparation . The research also showed that the decay rate is broadly consistent with sidewall tensile stress along the cross-section depth direction ; scuppers whether the changes in the steel liner plate thickness , convection Road around concrete especially sidewall surface of the flow channel of the concrete tensile stress extremum than large.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Hydraulics > Engineering hydraulics ( hydraulic construction hydraulics ) > Discharge structure hydraulics
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