折线型岸坡的演化特征与防治加固

Evolution Characteristics of Fold-line Bank and Its Control and Reinforcement

我国西南山区普遍存在典型折线型岸坡,后缘为岩质边坡,被结构面切割成危岩带,一方面危岩崩塌威胁坡体上场镇安全,另一方面,崩坡积物堆在斜坡上,演化成滑坡威胁下部街道的安全。同时前缘受河水冲刷侵蚀,形成牵引式滑坡,直接导致坡体上建构筑物损毁,威胁着场镇住户的生命财产安全。对这类岸坡,需要分类调查坡体上地质灾害发育情况,查明坡体前后缘及其中部变形特征,分析岸坡演化过程,有针对性地采取防治加固措施。本文以江陵滑坡为实例,分别调查后缘危岩带、中部古滑坡、前缘新滑坡的变形特征及其演化过程,采取"抗滑桩(桩板墙)支挡+地表排水+危岩治理"的综合治理措施对岸坡进行防治加固,效果良好。

Typical fold-line bank generally exists in the southwest mountainous area, trailing edge of which is rock slope and is cut as a dangerous rock band by its structural surface. On one side, the dangerous rock slides threaten safety of a town which is right on the rock ; on the other side, the colluvial deposits are heaped on the slope, which evolve into landslide threat to streets at the bottom of the rock. Meanwhile, the front edge of the bent bank is washed and eroded by the river water, which forms trail-type slope and immediately leads to damages of constructions on the slope. This threats life and property security of residents on the town. In allusion to this kind of slope, the developmental states of geologic hazard on the slope should be investigated categorically the transformation characteristics of the trailing edge and the front edge and the middle part of the slope should be classified, and the evolutionary process of the bank slope should be analyzed, so as to implement the control and reinforced measures with aim. This article takes Jianglin Landslide as a typical case, and surveys the transformed characteristics and evolutionary process for the trailing edge of the dangerous rock band, the fossil landslide of the middle section, and the front-edge of the new slide respectively. This article also introduces a comprehensive treatment of ＂retaining slide-resistant pile （ slab-pile wall） ＋ surface drainage ＋ dangerous rock governance＂ for the prevention, control and reinforcement of the band slope, and the good results are turned out.