Numerical simulation analysis of failure mechanism of expansive soil canal based on thermo-hydro-mechanics three-field coupling

IF 2.5 3区 工程技术 Q2 MECHANICS
Zhe Wang, Ling-kai Zhang, Hui Cheng, Xiao-ying Zhang
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引用次数: 0

Abstract

Under the action of multiple physical fields, slope failure frequently occurs in water conveyance canal projects in northern Xinjiang. The study of its failure mechanism is highly important for disaster prevention. To further study the sliding failure mechanism of the canal slope, COMSOL finite element numerical simulation software was used to establish a thermo-hydro-mechanical (THM) coupling theoretical model by the partial differential equation (PDE) modeling method. The model was analyzed from the perspectives of solar radiation, the lining structure, and the groundwater level. The results show that: (1) The influence of solar radiation causes the canal slope to produce a shade-sun slope effect, and the large U-shaped canal is the most obvious on a single day of the freezing period. The maximum temperature difference among the three structural canals reaches 4.1 °C, 8.1 °C, and 4.8 °C, but the temperature difference during the maximum freezing period decreases. (2) Canal cross-sectional form: The degree of frost heaving uniformity of different canals is as follows: U-shaped canal > arc-bottom trapezoidal canal > trapezoidal canal. The recovery ability of the trapezoidal canal is the worst, which easily results in a hollow state and detachment phenomenon, but the increase in frost heave displacement is the least affected by multiple freeze–thaw cycles. (3) Groundwater level influence: An increase in the groundwater level changes the freezing depth of the canal, which increases by only 2.81% at the top of the canal and 23.91% at the bottom of the canal. When the groundwater level increases and decreases, the maximum frost heave displacement of the extreme point of the canal slope will fluctuate. (4) Canal failure modes: An analysis of the failure characteristics of the canal slope under the action of three influencing factors reveals that the failure modes of the canal mainly include uneven frost heave on the slope surface, hollowing instability of the lining structure, and fluctuations in the extreme points of frost heave.

基于热-水-力三场耦合的膨胀土渠破坏机理数值模拟分析
在多种物理场的作用下,北疆输水渠工程边坡破坏频繁发生。研究其破坏机理对防灾具有重要意义。为进一步研究运河坡面滑动破坏机理,利用COMSOL有限元数值模拟软件,采用偏微分方程(PDE)建模方法建立热-水-力耦合理论模型。从太阳辐射、衬砌结构和地下水位三个角度对模型进行了分析。结果表明:(1)太阳辐射的影响使渠道坡面产生遮阳坡面效应,冻结期单日大u型渠道最为明显;三种结构渠道的最大温差分别为4.1℃、8.1℃和4.8℃,但最大冻结期温差逐渐减小。(2)渠道断面形式:不同渠道冻胀均匀程度分别为:u形渠道>;弧底梯形渠道>;梯形渠道。梯形渠道的恢复能力最差,容易出现空洞状态和脱离现象,但多次冻融循环对冻胀位移的增加影响最小。(3)地下水位影响:地下水位的升高改变了运河的冻结深度,运河顶部的冻结深度仅增加2.81%,运河底部的冻结深度仅增加23.91%。当地下水位升高或降低时,渠坡极值点的最大冻胀位移会发生波动。(4)渠道破坏模式:分析三种影响因素作用下渠道边坡的破坏特征,发现渠道破坏模式主要包括坡面不均匀冻胀、衬砌结构空穴失稳、冻胀极值点波动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.40
自引率
10.70%
发文量
234
审稿时长
4-8 weeks
期刊介绍: Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.
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