内昆铁路李子沟河谷地貌与谷坡稳定性

VALLEY MORPHOLOGY AND VALLEY SIDE STABILITY OF LIZIGOU RIVER IN NEIJIANG KUNMING RAILWAY

内昆铁路李子沟大桥是全线控制性工程 ,其 11号墩高陡边坡的整体稳定性系疑难问题。通过对李子沟的区域地貌结构和河谷地貌特征及其相关沉积的观察分析 ,确认 11号墩后倚山咀系李子沟高阶地 ,非不良地质堆积体 ,整体稳定。

The Lizigou long bridge is a dominant engineering of the Neijiang Kunming railway, and the stability of high and steep slope of No.11 pier in the bridge is a misgiving problem. With the observation and analysis to the morphostructure, the river valley shape and the correlative sediments of Lizigou area, it is considered that the step spur on the back of No.11 pier slope is a high terrace of Lizigou river, which is not a unfavorable geological accumulation form and is stable as a whole. During digging slope of the No.11 pier, the influence of engineeing activity is only on surface, and the whole stability of the slope is not shaken. Therefore, the design plan of reinforcing the slope is feasible.