評估環境溫度變化對淺層邊坡水力行為及穩定性之影響

Environmental Temperature Effect on Hydraulic Behavior and Stability of Shallow Slopes

張瑞恩(Rui-En Chang)；楊亞欣(Ya-Sin Yang)；葉信富(Hsin-Fu Yeh)

溫度 ； 土壤特徵曲線 ； 邊坡穩定性 ； 局部安全係數 ； Temperature ； Soil Water Characteristic Curves ； Slope Stability ； Local Factor Of Safety

中華防災學刊

16卷2期（2024 / 09 / 01）

149 - 166

繁體中文;英文

近年來氣候變化的影響增加了溫度變化對環境的影響，包括土壤的水力行為，然而，關於溫度變化對邊坡穩定性影響的研究是有限的。本研究建立了一個研究框架來量化不同溫度下未飽和淺層邊坡的安全係數，研究基於非等溫土壤水分特徵曲線模型，量化了土壤隨溫度變化的水力特性。水力耦合分析模型HYDRUS 2D和The Slope Cube Module被用來進行有限元素建模，並且基於局部安全係數理論，進行了邊坡穩定性分析。溫度升高使土壤之基質吸力、吸應力和局部安全係數下降，削弱了土壤強度。坡度模型分析表明，土壤在降雨入滲前後受不同的持水機制主導，溫度變化引起的趨勢也相應發生變化，降雨條件下土壤穩定性的變化主要受吸力和土壤滲透性變化的影響。本研究對土壤力學性質與溫度之間的關係進行了深入研究，這對保持土壤穩定性和預防地質災害具有重要意義。

The impact of climate change has recently increased the effects of temperature changes on the environment, including the hydraulic behavior of soils. However, studies on the effects of temperature change on slope stability are limited. This study established a study framework to quantify the safety factors of unsaturated shallow slopes at different temperatures. This study is based on a non-isothermal soil water characteristic curve model quantifying the tempera-ture-dependent hydraulic properties of soils. Hydraulic coupling analysis models HYDRUS 2D and The Slope Cube Module were used for the finite element modeling. A slope stability analysis was performed based on the local factor of safety (LFS) theory. An increased temperature de-creased the soil matric suction, suction stress, and LFS, weakening the soil strength. Slope modeling analysis showed that soils were dominated by different water retention mechanisms before and after rainfall infiltration, and the trends caused by temperature changes also changed accordingly. The variations in soil stability under rainfall conditions was mainly influenced by changes in suction stress and soil permeability. This study provides insights into the relationship between soil mechanical properties and temperature, which is valuable for maintaining soil stability and preventing geological hazards.