displacement can
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The maj or obj ect of this paper is the medium.small size concrete dams that have been used for many years.They have the characteristic that the alteration of water height of reservoirs is unobvious and the dams, displacements are affected mainly by temperature.With a case,the method of stepwise regression is used to analyze the vertical displacement prototyDe observed data.Then regression equation is established,the relation of dam,s displacement with hydraulic pressure、temperature、time effect is analyzed and the displacement change rule is obtained,the dam'S displacement onlv dependent to temperature is received.According to the theory of Finite Elements Method,the quasi-stationary temperature field formula and temperature stress formula are deduced.The QTP program and TFEM3D program are written with FORTRAN.The same case is calculated through QTP program to solve the quasi-stationary temperature and through TFEM3 D program to solve the dam'S displacement and find tlle dam,s deformation rule.This rule is accordant with the regression,S resuIt.
本文主要针对运行期间库水位变化很小、坝体的位移主要受温度变化影响的中小型混凝土坝,结合工程实例,采用逐步回归的方法对垂直位移原型观测资料进行分析,建立回归方程,分析坝体位移与水压、温度、时效之间的关系以及位移变化规律,分析结果坝体位移只与温度有关,而基本上不受库水位变化和时效的影响;根据有限元原理推求了混凝土坝准稳定温度场公式和温度应力公式,利用FORTRAN语言编制出QTP准稳定温度场程序和TFEM3D位移场程序,对大坝的温度场和位移场进行计算,求出坝体结点的变温值和坝体结点位移值以及单元应力分量,分析得到大坝的变形规律与实测资料以及回归统计变形规律一致,说明对坝体准稳定温度场的研究是正确的。
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On the basis of the present construction situation of Sinitic mountain tunnel method, the new concepts of ahead displacement, releasing displacement in excavating, early displacement and the later displacement, which are the new division from the tunnel excavation displacement three-dimensional effect, have been proposed.
结合山岭隧道新奥法施工现状,首次提出了隧道位移空间效应的"先期位移"、"开挖瞬时释放位移"、"前期位移"和"后期位移"的新概念。
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Results show that amplitude of displacement excited by vertical incidence wave is larger than that excited by inclined incidence wave and not influenced greatly by the incidence angle. In vertical incidence, amplitudes of displacement of two points at the same altitude along each cavern are basically identical and maximum relative displacement occurs between top and bottom point of the cavern. While in the case of inclined incidence, displacement amplitude on sides meeting the wave is larger than that on leed sides, and maximum relative displacement occurs on left skewback and bottom of the cavern.
结果表明,位移幅值受入射角度的影响不敏感,竖直入射比斜入射情况要大;竖直入射时,各洞室两侧同一高程处的位移幅值基本相同,相对位移差最大部位为洞顶与洞底,而斜入射时迎波面比背波面一侧位移大,且相对位移差最大部位为洞室迎波面的左拱座与洞底。
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displacement can:排水罐
displacement 位移,排量 | displacement can 排水罐 | displacement-time graph 位移-时间关系线图