缓坡顺倾红层路堑边坡破坏模型试验研究  

Model test research of slope destruction of gentle slope along dip red-bed cutting slope

作　　者：周锋 蒲黍絛 王海勇 Zhou Feng;Pu Shutao;Wang Haiyong(POWERCHINA Guiyang Engineering Co.,Ltd.,Guiyang Guizhou 550081,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《山西建筑》2025年第5期71-77,93,共8页Shanxi Architecture

基　　金：国家重点研发计划课题(课题编号:2018YFC1504901)。

摘　　要：为研究缓坡顺倾红层路堑边坡的致灾机理,采用基于颗粒流模型的相似材料和双向正梯形(前视)模型装置,针对缓坡顺倾红层路堑边坡,在干湿循环、浸水软化和路堑开挖工况模拟条件下进行物理模型试验,展现其变形破坏过程,分析其在开挖卸荷及强度劣化下的变形破坏演化过程。模型试验结果表明:路堑开挖后,坡体卸荷效应明显,前部出现楔形体破坏,后缘拉裂缝逐渐扩大,随着干湿循环的进行,坡体首先沿上层泥岩软弱层滑移,并牵引着坡体后缘继续发生拉裂,随后滑裂面延伸至下层泥岩软弱面,由此发生大规模滑坡,滑面呈步进台阶状,缓坡顺倾红层路堑边坡致灾机理主要体现为红层软岩在岩层面顺倾条件下历经开挖卸荷和水岩耦合的成灾作用过程而呈现松弛劣化和水敏劣化的灾变演化规律。In order to study the disaster mechanism of gentle slope along dip red-bed cutting slope,similar materials based on particle flow model and two-way trapezoidal model device are adopted.For gentle slope along dip red-bed cutting slope,physical model test is carried out under the simulation conditions of dry wet cycle,soaking softening and cutting excavation conditions to show its deformation and failure process,the deformation and failure evolution process under excavation unloading and strength deterioration is analyzed.The model test results show that after the cutting excavation,the unloading effect of the slope is obvious,the wedge failure appears in the front,and the tensile crack at the trailing edge gradually expands.With the dry wet cycle,the slope first slides along the weak layer of the upper mudstone,pulls the trailing edge of the slope to continue to crack,and then the sliding surface extends to the weak surface of the lower mudstone,resulting in a large-scale landslide,and the sliding surface is in a step-by-step shape;Based on the results of model test,it can be seen that the disaster causing mechanism of gentle slope inclined red bed cutting slope is mainly reflected in the disaster evolution law of relaxation deterioration and water sensitivity deterioration of red bed soft rock after the process of excavation unloading and water rock coupling under the condition of rock surface inclined.

关 键 词：顺倾红层路堑边坡 模型试验 松弛劣化 水敏劣化 坡体开挖 

分 类 号：TU413.62[建筑科学—岩土工程]