牛背至天水高速公路路域环境地质安全性评价方法探讨

天(水)宝(鸡)高速公路牛背至天水段工程通过地区地质构造复杂,岩土种类繁多,岩土工程和环境地质安全如果不加以重视,易造成道路的地质灾害,直接影响到工程建设的质量和安全性,也将给未来运营安全带来严重的隐患和经济损失.在野外地质调查的基础上,探讨了公路路域环境地质安全性评价的影响因素和安全性评估内容,通过遥感技术等方法对地质和岩土工程信息提取并进行安全性评价,对研究区进行了初步评价,并提出了应对措施.

Evaluating Method of Environmental Geological Safety along Niubei-Tianshui Expressway

On the basis of the field investigation and analysis of the land damaged of geological hazards by remote sensing and historical documental records,role of geology in engineering,hydrologic influences,geologic exploration of engineering sites,mapping,rock mass classifications,geological engineering aspects of underground excavations,slopes are introduced.Complex geological structure,special geographical setting,various rock and soil types,steep landform and frequent rainfall along highway engineering domain of Niubei-Tianshui Section of Tianshui-Baoji Expressway are risk factors for building engineering and mountainous highway environmental geological safety,and should be deeply attention,and evaluation of natural environment and land use safety by GIS and remote sensing are employed in highway building.The engineering geological investigation of highway engineering can be divided as different phases,the working contents and methods of each investigation phase are also put forward.Field mapping of faults,scarps,mass wasting units,Quaternary deposits,fractures,folds,and bedrock is a first step of evaluation on environmental geological safety.Overseeing the on-site hazard data collection and assessment efforts,by analyzing data,it provides accurate and complete onsite hazard recommendations.The results show that there are 61geological disasters potential risk sites in the highway engineering domain of Niubei-Tianshui Section,including 29landslides,25scarps fallings and 7 debris flows.