基于空间插值的室内湿度场模拟方法比较分析

空间插值是研究空间因子区域分布特征的重要方法,可实现空间因子可视化展示。不同的空间因子受影响不同,导致空间插值方法的可靠性和适用性存在差异。为了确定室内区域湿度场动态实时化模拟的最佳方法,以Inter实验室内54个温湿度传感器的一个月采集数据为研究案例。综合分析了反距离权重插值、径向基函数插值、普通克里金插值、协同克里金插值、时空克里金插值和时空协同克里金插值6种空间插值方法,并采用交叉验证的方法对插值结果进行比较。结果表明,时空协同克里金插值方法在模拟准确度、可信度和反应极值等能力都要优于其余几种插值方法。

大跨径预应力混凝土连续箱梁湿度场模拟分析

为研究大跨径预应力混凝土连续箱梁在干燥环境下顶板、腹板和底板随时间变化的湿度分布状况,通过埋设传感器,对小清河大桥在干燥作用下的湿度场分布做了试验研究,结果表明:顶板、腹板和底板表面位置一处的相对湿度均表现出较快的下降趋势,直至与外部环境的相对湿度相接近时开始变得缓慢,干燥作用使混凝土表面的水分更易丢失,随着时间的增长,干燥作用逐步向混凝土内部延伸,其作用影响范围也会变大,且随着混凝土龄期的增长,其内部湿度扩散系数会有所降低。

Numerical Simulation for Roadways in Swelling Rock Under Coupling Function of Water and Ground Pressure

According to the analogical relation in the governing differential equations of the humidity stress field theory and the temperature stress field theory, the problem of solving the humidity stress field was transformed into that of solving the temperature stress field by the change of parameters. As a result, the problem of roadways in swelling rock under the coupling function of water and ground pressure can be solved by the analytical module of temperature stress field in software ANSYS. In the numerical simulation mentioned above, three kinds of supporting, i.e. steel support, bolting support and non support, were taken into account, the pressure distribution and deformation state of roadways with a swelling rock floor under the coupling function of water and ground pressure were analyzed and compared with those in the action of only ground pressure. The research results provides a scientific basis for the deformation control of roadways in swelling rock.

增湿作用下膨胀土隧道围岩变形及稳定性分析

增湿作用下,膨胀围岩与水分相互作用直接影响隧道稳定性,从而引发隧道病害。为了明确围岩膨胀特性、归纳增湿作用下膨胀土隧道受力变形规律,本文以早胜三号隧道为背景,通过室内试验与数值模拟相结合的方法,在ABAQUS内置温度场模拟湿度场的理论基础上,分析含水率变化及7种工况下不同空间位置局部膨胀的隧道围岩变形及稳定性变化规律。结论:含水率的增大加剧了拱顶处围岩变形,反向抑制了仰拱处围岩变形;局部膨胀时,膨胀部位围岩变形随之增大;增湿作用下初期支护的最不利部位为仰拱,其次为边墙;当拱顶和仰拱同时受膨胀力与边墙和仰拱同时受膨胀力时,隧道初期支护处于最危险状态。研究成果可有效指导膨胀土隧道围岩变形控制及初期支护结构设计。