土石坝蓄水饱和湿化变形探讨  

Discussion on Saturation and Moisture Deformation of Embankment Dam

作　　者：孙向军 SUN Xiangjun(Hohai University,Nanjing 210098,Jiangsu,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《黄河水利职业技术学院学报》2024年第3期8-14,共7页Journal of Yellow River Conservancy Technical Institute

摘　　要：土石坝在蓄水期产生的过量变形会导致坝体结构应力重分布,进而使得某些部位损坏。对此,大量学者在筑坝料室内湿化特性及土石坝初期蓄水阶段应力变形的有限元模拟方面,开展了一系列研究。为进一步提高土石坝蓄水阶段变形控制水平,对现有研究成果进行了归纳分析,结果表明:坝料室内湿化试验技术的核心在于湿化变形测量、含水量测量及应力控制方法,在这些方面仍待进一步优化;关于湿化机理,目前仍缺乏有力的验证;按不同的湿化变形分解模式,会得到各异的湿化变形经验模型;“初应变法”数值模拟需假定湿化应变分解法则,“初应力法”得到的湿化变形较小。结合分析结果,提出以湿化孔隙比取代湿化变形,研究浸水饱和全过程中的孔隙比—饱和度关系的新研究思路。The excessive deformation of embankment dam during the water storage period will lead to the redistribution of structural stress,and then some parts will be damaged.In this regard,a large number of scholars have carried out a series of researches on the indoor moisture characteristics of dam materials and the finite element simulation of stress and deformation of embankment dam in the initial impounding stage.In order to further improve the deformation control level of embankment dam during the water storage period,the existing research results are summarized and analyzed.The results show that the core of indoor moisture test technology of dam material is the measurement of moisture deformation,water content and stress control,which need to be further optimized.As for the moisture mechanism,there is still a lack of effective verification.According to different decomposition modes of moisture deformation,different experiential models of moisture deformation can be obtained.The numerical simulation of“initial strain method”should assume the law of decomposition of moisture strain,and the moisture deformation obtained by“initial stress method”is small.Finally,a new research idea is put forward to research the relations of pore void ratio and saturation in the whole process of saturated water by replacing moisture deformation with moisture void ratio.

关 键 词：土石坝蓄水饱和 三轴湿化试验 湿化变形 湿化孔隙比 有限元模拟 空间变异性 

分 类 号：TV641.4[水利工程—水利水电工程]