利用不完全概率数据确定粘土层不确定力学参数的各向异性空间变化特征

IF 3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Probabilistic Engineering Mechanics Pub Date : 2024-04-01 DOI:10.1016/j.probengmech.2024.103623
Tao Wang , Jiazeng Cao , Jie Liu , Jingshu Xu , Guoqing Zhou
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引用次数: 0

摘要

暴雨下粘土层的不确定力学参数是滑坡地质灾害动态演化过程和稳定性评估的关键。由于环境、工程地质和物理化学过程的复杂性,粘土层的力学参数呈现出显著的空间变异性和相关性。此外,由于技术和经济条件的限制,软粘土的实际调查和测试数据非常有限,严重制约了粘土边坡的稳定性评价和失稳灾害的防治。为了利用不完全概率数据表征粘土层不确定力学参数的各向异性空间变化,测量了饱和条件下的弹性模量、泊松比和抗剪强度,分析了不确定力学参数的统计数据和变化特性。提出了表征粘土层不完全概率数据的建模方法。通过比较测量数据和模拟数据的统计特征,验证了所提方法的准确性。还提出了一种新的线性拟合方法,用于评估波动尺度和自相关距离。讨论了软粘土层不确定力学性能的可变性和相关性。结果表明,粘土层的力学特性在空间位置上是不确定的。三个力学参数的原始观测数据和模拟数据都具有对称的相关结构。粘土层在土壤剖面上呈现水平分层结构,垂直自相关距离比水平距离短。本文利用不完全概率数据清楚地说明了粘土层不确定力学参数的各向异性空间变化,可为暴雨条件下粘土边坡的不确定性分析和风险评估提供科学数据。
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Characterizing anisotropic spatial variations of uncertain mechanical parameters for clay layer using incomplete probability data

The uncertain mechanical parameters of clay layer under torrential rain are the key to the dynamic evolution process and stability assessment of landslide geological hazards. Due to the complex environment, engineering geology and physical chemistry process, the mechanical parameters of clay layer show significant spatial variability and correlation. In addition, due to technical and economic conditions constraints, the actual investigation and test data of soft cohesive soil are very limited, which seriously restricts the stability evaluation of clay slope and the prevention of instability disaster. To characterize anisotropic spatial variations of uncertain mechanical parameters for clay layer using incomplete probability data, the elastic modulus, Poisson ratio and shear strength under saturated conditions were measured, and statistical data and variation properties of uncertain mechanical parameters were analyzed. A modeling approach was proposed for characterizing incomplete probability data of clay layer. The accuracy of the proposed approach is verified by comparison of the statistical characteristic for measured data and simulated data. A novel linear fitting method was proposed for assessing scale of fluctuation and autocorrelation distances. The variability and correlation of uncertain mechanical properties for soft cohesive soil layer are discussed. The results show that the mechanical properties of the clay layer are uncertain in spatial position. Both the original observation data and the simulated data of three mechanical parameters have symmetrical correlation structure. The clay layer display the horizontal layered structure on the soil profile, and the vertical autocorrelation distances are shorter than the horizontal distances. This paper clearly illustrates the anisotropic spatial variations of uncertain mechanical parameters for clay layer using incomplete probability data and it can provide scientific data for the uncertainty analysis and risk assessment of clay slope under torrential rain conditions.

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来源期刊
Probabilistic Engineering Mechanics
Probabilistic Engineering Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
15.40%
发文量
98
审稿时长
13.5 months
期刊介绍: This journal provides a forum for scholarly work dealing primarily with probabilistic and statistical approaches to contemporary solid/structural and fluid mechanics problems encountered in diverse technical disciplines such as aerospace, civil, marine, mechanical, and nuclear engineering. The journal aims to maintain a healthy balance between general solution techniques and problem-specific results, encouraging a fruitful exchange of ideas among disparate engineering specialities.
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