赣南边坡变形破坏模式与防治对策

Slope Deformation and Failure Mode and Prevention Counter Measures in Southern Jiangxi

赣南地质环境复杂,沉积岩、岩浆岩与变质岩交叉并存;岩浆岩广泛分布,岩体破碎;褶皱、断裂构造发育;风化作用强烈,边坡稳定性差。研究这一地区的变形破坏模式,可以科学有效地对边坡进行防治。大量的野外调研显示,赣南边坡常见的类型主要有土质边坡、类土质边坡、岩质边坡和岩土二元结构边坡4类;赣南边坡常见的变形破坏模式主要有:沿原有结构面滑动、沿顶部拉裂-滑动、土体拉裂-崩塌、圆弧形滑动、坡面冲刷5类。沿原有结构面滑动破坏多见于岩质边坡、类土质边坡中;其余破坏模式多发生于土质边坡、类土质边坡、岩土二元结构边坡的土体部分。根据赣南边坡不同的变形破坏模式,分别提出了科学的防治对策;并针对赣南地区降雨量大、降雨持时长等特点,强调了在边坡的施工过程中应及时修建边坡排水系统,及时进行坡面防护。

The geological conditions in southern Jiangxi are complicated： interbedded coexistence ot seal- mentary, magnetic and metamorphic rocks, wide distribution of magmatite, with broken rockbodies, well development of folds and faults and strong weathering as well as poor stability of the slope. Hence, it is necessary to study the deformation and failure mode of this area for the scientifc and effective protection of the slope, southern Jiangxi field surveys and reseaches show that the common slope types in southern Jian- gxi mainly include soil slope, soil-liker slope, rock slope and soil and rock of dualistic structure slope. The southern Jiangxi common slope failure mode in the area include sliding along the primary structure face , a- long the top tension sliding , tension cracking and failing of soil mass, slumping slide, and downwash. Sliding along the primary structure face is more common in the rock slope and soil-like slope; the rest of the failure mode occurs in soil slope, soil-like slope , soil and rock of dualistic structure slope of the soil body. According to the different slope deformation and failure mode, this study proposes the counter measures to handle the problems and stresses that the slope drainage system during the process of the pro- ject should be timely constructed and the slope face should be protected during the process of slope project because of the heavy rainfall and the long duration of the rainfall in southern Jiangxi.