寒区水工建筑物应力条件分析

Analysis of stress-strain conditions in water structures

结合寒区水工建筑物的稳定性问题,对寒区水工建筑物应力条件的分析是一个复杂的过程。通过流变学模型以及使用计算机有限元计算的数值方法,对寒区水工建筑物应力条件进行分析。指出:(1)建筑热弹性力学(建筑热流变学),不同侧重点条件下可以分为如下四条分支:经典的温度影响弹性理论,包括超高温和超低温,接近绝对零度;温度变化中的塑性理论、黏度、蠕变理论和黏塑性流动理论(变形理论);动态弹性(弹性动力学),包括热冲击和热弹性力学的部分,考虑到变形场和温度的相互影响;应用的热弹性力学(热流变学)。(2)土堤坝应力应变条件的计算是数学物理学的一个复杂问题。其主要在于解冻土壤力学方面的流变学问题。(3)通过使用增量塑性应变和应力之间的联系和非关联规律来制作应力应变条件的各种模型,并引入考虑加载土壤膨胀的参数,可以解决土堤坝的很多问题。(4)使用计算机有限元计算的数值方法可以解决土堤坝研究中的各种问题。

Combined with the stability of the water structures in the permafrost area,the analysis of stress-strain conditions of the water structures in the permafrost area is a complex problem.According to rheological mode and computer use for numerical method of finite element calculations.It points out：（1）Building thermoelasticity（building thermorheology）.The following branches are distinguished：classic theory of elasticity in temperature influence,including ultrahigh and low temperatures,close to absolutezero;theories of plasticity,viscosity,creep theory and viscous-plastic flows in temperature changes（theories of deformations）;dynamic elasticity（elastokinetics）that includes parts of heat shock and thermoelasticity that consider mutual influence of deformation fields and temperature; applied thermoelasticity（thermorheology）.（2）Calculations of stress-stain conditions of earth dams are a complex problem of mathematical physics,which mainly lies in the thawing of soil mechanics rheological problems.（3）There are a lot of various models of stress-strain conditions that were worked out using associate and non-associated laws of connection between incremental plastic strain and stress,and introducing parameters that consider soil dilatancy in loading.（4）Earth dams solution requires computer use for numerical method of finite element calculations.