摘要
小溪隧道进口危岩位于重庆市涪陵区乌江西岸,岸坡陡峻。陡崖脚泥岩风化凹进形成崖腔,陡崖顶有阶梯状陡坎,在构造裂隙、软弱陡崖基座、卸荷裂隙带等因素的控制下,稳定性极差。作者采用地质分析和量化分析方法对危岩作了稳定性评价。危岩破坏形式有坠落、倾倒和滑塌3种。随着软弱基座差异性风化的进一步发展、崖腔进一步扩大、卸荷裂隙逐渐连续贯通,危岩体将失去稳定产生崩塌。采用支撑、锚固、拦石、排水、少量危石清除相结合的综合防治措施,是行之有效的。通过3个水文年的监测显示,本区工程在经历多个雨季后,每个监测点都是稳定的,危岩整治效果明显,防治措施起到了良好作用。
The rill tunnel portal dangerous crag is the west bank of Wu River in Fuling District, Chongqing. The bank slope is high and precipitous. There is the cliff cavity because of weathered mudstone at the steep mountain cliff foot. There are steep ridges as ladder on the top of the cliff. The cliff is no longer stable because of the factors such as structure crevasse, weak steep mountain cliff base, discharge crevasse belt. The author calculated the dangerous crag with two methods： geologic analysis and quantized assessment. There are three kinds of destruction forms, including crash, leaning over to and slippery collapsing. The further development, the cliff cavity makes decent which along with the weak base difference further expands, the discharge crevasse continuously links up gradually, the danger crag body will lose stable and lead to avalanche. The preventing and controlling countermeasure uses the strut, the anchor, blocking the stone, draining water, eliminating the few dangerous stone. This is effective. It is demonstrated through three hydrology years＂ monitoring, that each test point all is stable at the home court project after many rainy seasons. The effect of the danger crag renovated is obvious. The treatment method has played the good role.
出处
《地质灾害与环境保护》
2006年第4期23-27,共5页
Journal of Geological Hazards and Environment Preservation
关键词
危岩
陡崖
稳定性评价
治理措施
dangerous crag
steep mountain cliff
stability analysis
treatment method
