







摘 要:為準確分析短期強降雨、長期弱降雨和周期性降雨中哪種降雨模式對土質邊坡滲流場的影響最大,根據非飽和土滲透系數和飽和土滲透系數的對應關系,該文利用FLAC3D軟件監測降雨入滲過程中的地下水位,并用FISH語言實時更新非飽和土的滲透系數,進而確定邊坡內部的滲流場變化規律。在廣西平陸運河邊坡工程現場中監測坡面土質含水量的變化,并將數值模擬結果與現場試驗數據進行比較,驗證數值模擬結果的可靠性。通過該文提出的數值模擬分析程序,繪出在不同降雨模式下邊坡上非飽和土的滲流特征情況,研究結果可指導邊坡工程在降雨過程中制定支護方案。
關鍵詞:邊坡工程;降雨模式;滲流場;數值模擬;非飽和土
中圖分類號:TU43 文獻標志碼:A 文章編號:2095-2945(2024)29-0090-04
Abstract: In order to accurately analyze which rainfall mode has the greatest influence on the seepage field of soil slope among short-term heavy rainfall, long-term weak rainfall and periodic rainfall, according to the corresponding relationship between the permeability coefficient of unsaturated soil and the permeability coefficient of saturated soil, we use FLAC3D software to monitor the groundwater level in the process of rainfall infiltration, and use fish language to update the permeability coefficient of unsaturated soil in real time, and then determine the variation law of seepage field in the slope. The change of soil water content on the slope was monitored in the Pinglu Canal slope project in Guangxi, and the numerical simulation results were compared with the field test data to verify the reliability of the numerical simulation results. Through the numerical simulation analysis program proposed in this paper, the seepage characteristics of unsaturated soil on the slope under different rainfall modes are drawn, and the research results guide the slope engineering to formulate the support scheme in the process of rainfall.
Keywords: slope engineering; rainfaGZBTzePtEyhB8uehVjTBQdi0Cfia2L0TiNJ1mGY9UmA=ll model; seepage field; numerical simulation; unsaturated soil
降雨模式包括長期弱降雨、短期強降雨、雨季周期性降雨。在降雨過程中,由于地下水位的上升,邊坡負孔隙壓力和安全系數急劇下降。在過去的幾十年中,越來越多的研究人員開始研究不同降雨模式下邊坡滲流場的變化規律[1-2]。該研究從降雨模式的2個方面進行[2]:降雨強度和持續時間[3-4]。在研究降雨對邊坡穩定性影響的過程中,研究人員更愿意研究短期強降雨對邊坡穩定性的影響[5]。然而,在長期弱降雨和周期性降雨期間,有許多邊坡工程事故發生[6-8]。
由于試驗條件的限制,一些研究人員轉向數值模擬軟件來模擬和分析降雨條件下邊坡的滲流場變化規律。……