广东省某省道路基边坡滑塌处治关键问题分析及对策

Analysis and Countermeasures for Key Issues in Treatment of Roadbed Slope Collapse of Provincial Highway in Guangdong

摘要:

广东省某省道北侧紧邻一物流产业园，产业园建设须开挖省道右侧边坡。产业园边坡开挖施工后，2024年该地区连降暴雨，使得省道 K5+100~K5+600段出现不同程度的路基下陷、路面开裂、边坡位移，其中 K5+240~K5+380 段出现滑坡，最大沉降量约3.06 m，最大位移约5.5 m。详细描述该路基边坡失稳造成滑坡的过程，该边坡滑移具有持续时间长、多阶段性、多次位移等特点。分析认为，造成边坡滑移主要因素为中风化灰岩遇水软化、公路排水设施不完善、产业园边坡施工工序不合理、应急措施不及时。采取降低公路纵断面减载结合抗滑桩、微型桩加固、完善排水等方案，并取得良好效果，为复杂地域环境下路基边坡处理提供参考。

Abstract:

A logistics industrial park is adjacent to the north side of a provincial highway in Guangdong Province. The construction of the industrial park must excavate the right slope of the provincial highway. After the slope excavation construction of the industrial park, the continuous rainstorm in 2024 in this area caused the varying degrees of roadbed subsidence, pavement cracking and slope displacement on the sections of provincial highway K5+100~K5+600, in which a landslide occurred in the section from K5+240 to K5+380, with a maximum settlement of approximately 3.06 m and a maximum displacement of approximately 5.5 m. The process of landslide caused by the instability of the roadbed slope is described in detail. The slope sliding is characterized by a long duration, multiple stages and multiple displacements. The analysis shows that the main factors causing slope sliding are the softening of moderately weathered limestone upon contact with water, the incomplete drainage facilities of the highway, the unreasonable construction procedures of the industrial park slope, and the untimely emergency measures. The schemes such as reducing the load on the longitudinal section of the highway in combination with anti-slide piles, micro-pile reinforcement, and improving drainage are adopted and the good effects are achieved, which provides the reference for the treatment of roadbed slopes in complex geographical environments.