西宁黄土饱和度与湿陷应变的变化规律及数值模拟研究  

Variation in Degree of Saturation and Wetting of Collapse Strain of a Loess Soil in Xining and its Numerical Simulation

作　　者：叶润泽 刘宏[1] 鄢天柱 YE Runze;LIU Hong;YAN Tianzhu(Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550055)

机构地区：[1]贵州大学喀斯特地质资源与环境教育部重点实验室,贵阳550055

出　　处：《土工基础》2024年第4期669-673,共5页Soil Engineering and Foundation

摘　　要：为探究西宁市黄土湿陷变形特征及其在数值模拟技术中的实现,以期解决当前模拟方法中因未充分考虑饱水过程中饱和度与湿陷应变的变化规律,而未能较好反映黄土湿陷特征的问题,提出了应用该变化规律的黄土湿陷数值模拟方法。通过对西宁市黄土湿陷引发的地面沉降和地面塌陷灾害进行现场地质调查,并在室内湿陷试验的基础上自主改设试验,获得饱和度为40%~100%区间的湿陷应变特征曲线,采用数值模拟软件ABAQUS材料库中moisture swelling模块进行了研究分析。结果表明,该方法可有效建立西宁市黄土湿陷数值分析模型,模拟结果与实际情况基本一致,验证了所建模型及方法有效可行,对黄土湿陷的数值模拟方法具有一定的参考价值。To explore the deformation characteristics of the collapsibility of a loess soil in Xining City and its numerical simulation method are presented in this paper.The current simulation methods on the collapsibility of loess soils do not fully consider the variation of the degree of saturation and the collapsible strain in the process of the water saturation.To better reflect the characteristics of the collapsibility of loess soils,a numerical simulation of the collapsibility of the loess considering the variation is proposed.The onsite geological investigations on the land subsidence and ground subsidence hazard caused by the collapse of the loess soils in Xining City were performed.The laboratory test results on the collapsibility were also performed to obtain the collapsible strain characteristics of soil samples with a range of degree of saturation from of 40%to 100%.The collapsing strain characteristic curve was studied by using the moisture swelling module of the numerical simulation software ABAQUS material library.The results show that the method can effectively establish the numerical analysis model of the collapsible loess soils in Xining City.The simulation results are generally consistent with the actual observed conditions.It is verified that the established model and the method are effective and feasible.

关 键 词：湿陷性 饱和度 湿陷应变 moisture swelling 模拟方法 

分 类 号：TU444[建筑科学—岩土工程]