铜矿岭不稳定斜坡类型识别与工程地质分区

Type identification and engineering geology zoning of the unstable slope in Tongkuangling

高速公(铁)路路基、隧道和桥梁工程等常常因地质灾害的存在而影响正常使用,尤其是类型不明的不稳定斜坡,明确地质灾害类型是影响不稳定体治理方案的首要任务。以宜巴高速公路铜矿岭不稳定斜坡为研究对象,采用野外地质调查、工程地质分析和监测数据分析的方法,判明了铜矿岭不稳定斜坡类型。野外调查结果表明该不稳定斜坡上部为残坡积物,下部为反倾结构的粉砂岩;结合位移监测数据,判定该不稳定斜坡变形存在多个剪切滑移带,但主要分布于松散堆积物内部,综合判定该不稳定斜坡为深层蠕动变形体;依据变形大小和变形方向变化特点,最后将该变形体分为两个大区,Ⅱ区又可细分为2个小区,并指出Ⅱ_(2)区是未来防治的关键部位。研究成果为该不稳定斜坡后续治理设计提供了地质依据,证明传统的工程地质调查、分析与位移监测相结合是开展不稳定体类型判识,确定边界范围的有效手段。

The subgrade,tunnel and bridge engineering of highways or railways may be affected by some geological disasters,especially by unknown disaster types,which directly affects the overall treatment decision.This article takes the Tongkuangling unstable slope on the Yiba Expressway as an example andidentifies the types of the Tongkuangling unstable slope by using field geological surveys,engineering geological analysis and monitoring data analysis.The field investigation shows that this unstable slope is made up of the eluvial deluvial deposit of the upper part and siltstone with an inverted layer of the lower part.Combined with the displacement monitoring data,it is determined that there are multiple shear slip surfaces in the loose deposits.The unstable slope is comprehensively determined to be a deep creep deformation body.Last,according to the characteristics of deformation,the Tongkuangling deformation body is finally divided into two zones,of which zoneⅡcan be subdivided into two small zones.The Ⅱ_(2) zone is the key control part.This provides the geological basis for the subsequent treatment design of the deep deformation body.It can be seen that the combination of traditional engineering geological surveys and monitoring data analysis is an effective means to identify the type of geological disasters and determine the boundary range.