国道321线七宝莲边坡失稳机制与整治措施

对国道321线七宝莲边坡的气候、地质、地貌、水文等条件进行了综合分析，认为该边坡是潜伏着危险的不稳定边坡，其中地质构造、岩体结构、地表水和地下水作用是边坡变表破坏的主要影响因素，建议采用预应力框架挡土墙对边坡进行加固的防护措施。

INSTABILITY OF QIBAOLIAN SLOPE ALONG NATIONAL HIGHWAY 321 AND ITS PRECAUTIONS

A comprehensive analysis on climatic, geological, geomorphologic conditions of Qibaolian slope along National Highway No.321 indicates that the slope is unstable. Qibaolian slope is located in the central zone of a geological compress structure where rock folding, fractures and loose textures are common.The rock is strongly decomposed, rich in clay and flaky mineral and high in permeability. Activities of underground water play a triggering role in slope failure. The hydrodynamic erosion of the Xijiang River has a great influence on the stability of the slope. Because of the unfavorable factors the slope is in a dangerous situation. To take precautions against slope collapse, it is suggested that restressed skeleton wall could be used, the underground water should be drained, and the river bank along the highway be peotected.