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劉付海

（ 北京城建勘測設計研究院有限責任公司 ，北京 100101)

摘   要 ：為研究云南某工程出現的易崩解泥巖邊坡在降雨條件下的穩(wěn)定性問題 ，室內開展了崩解特性試 驗 、膨脹率試驗 、膨脹壓力試驗 ，以及強降雨條件下易崩解泥巖的入滲試驗 ，主要結論如下 ：易崩解泥巖試樣 表現出極強的崩解性 ，崩解 10 次循環(huán)后殘留物僅占原巖樣質量的 3% ;  其耐崩解指數在循環(huán)中逐漸提高但變動 較小 ，說明循環(huán)次數對耐崩解指數的影響不大 ；易崩解泥巖試樣在側限條件下的軸向膨脹變形顯著 ，最終膨脹 率約 11 . 2% ,  膨脹過程可以劃分為快速膨脹 、減速膨脹 、穩(wěn)定膨脹 3 個階段 ； 隨著降雨強度的增大 ，易崩解泥 巖入滲率時程曲線的積水點與飽和點出現得越來越早 ，積水點與飽和點之間的間隔越來越小 ；在同一降雨強度 下 ，降雨入滲深度與降雨時間正相關 ； 同一降雨歷時下 ，入滲深度與降雨強度間正相關。

關鍵詞 ：降雨 ；易崩解泥巖 ；邊坡 ；破壞機理

中圖分類號 ：TU045           

文獻標志碼 ：A   

 文章編號 ：1005- 8249  (2023)   04- 0037- 05

 DOI :10. 19860/j . cnki . issn1005- 8249. 2023 . 04. 006           

LIU Fuhai

( Beijing urban construction survey ,   design and Research Institute Co. ，Ltd. ，Beijing 100101 ,   China)

Abstract: In order to study the stability of the easily disintegrating mudstone slope in a project in Yunnan under rainfall conditions, the disintegration characteristic test, the expansion rate test, the expansion pressure test, and the easy disintegration mudstone under heavy rainfall were carried out in the laboratory. The main conclusions of the infiltration test are as follows:The easily disintegrating mudstone sample shows extremely strong disintegration, and the residue after 10 cycles of disintegration only accounts for 3% of the mass of the original rock sample; its disintegration resistance index is in the It gradually increases during the cycle but changes little, indicating that the number of cycles has little effect on the disintegration resistance index; The axial expansion deformation of the easily disintegrating mudstone sample under the confinement condition is significant, and the final expansion rate is about 11.2%. The expansion process can be divided into three stages: rapid expansion, decelerated expansion, and stable expansion; With the increase of rainfall intensity, the water accumulation point and saturation point of the infiltration rate time history curve of easily disintegrating mudstone appear more and more. In the early days, the interval between the water accumulation point and the saturation point became smaller and smaller; under the same rainfall intensity, the rainfall infiltration depth was positively correlated with the rainfall time; under the same rainfall duration, the rainfall infiltration depth was positively correlated with the rainfall intensity.

Keywords: rainfall; easily disintegrating mudstone; slope; failure mechanism

作者簡介：劉付海  ( 1971 —) ,  男，碩士， 高級工程師，研 究方向 ：巖土工程勘察。

收稿日期 ：2022- 04- 05