京珠高速公路108滑坡及防治工程分析

Analyses of No.108 Landslide in Beijing-Zhuhai Highway and Its Treatment Measures

在分析京珠高速公路108滑坡形成的地形地貌、地层岩性、地质构造及地下水条件的基础上,探讨了滑坡产生的物质条件及外部原因,分析了滑坡主要防治工程的效果.结果表明:厚度大、强度低的第四系残坡积土是滑坡产生的物质基础;地下水富集并软化滑带是滑坡产生的重要条件;边坡开挖和降雨是滑坡产生的直接诱因;采用微型钢管压力灌浆及截排水隧洞治理滑坡是有效的.

Based on analyzing the conditions of landform, strata lithology, geologic structure and underground water, external and internal causes of No.108 landslide occurring were discussed, and the effects of two antisliding measures were analyzed. The result shows that eluvialdeclivous soils in Quaternary system with a large thickness and low strength is the basic cause of the landslide, the enrichment of underground water, leading to the decrease in the shear strength of slide surfaces, is an important condition of its formation, and slope excavation and rail falling are the direct cause of the landslide. The analysis also indicates that the underground drain tunnel and bored grouting can control the development of a landslide effectively.