湛徐高速公路徐闻港支线特殊性岩土工程地质特征及评价

Evaluation of engineering geological conditions of the special rock and soil along Xuwen port branch line of Zhanxu express way

通过运用工程地质调查、测绘、钻探、简易勘探等方法,开展工程地质特征分析及评价工作。结果表明:项目全线划分为沿海平原区与台间洼地、一级台地、二级台地、三级台地、四级台地等5类工程地质区。沿线特殊性岩土主要为软土、孤石、高液限土、人工填土。软土为潜在软基,高液限土存在膨胀性,误以孤石为桩端持力层将导致桩基失稳,设计时需予以注意。空洞发育易引发桥梁桩基桩端承载力减弱导致桥梁失稳,建议采取防漏浆措施,混凝土灌注。

Based on engineering geological survey,mapping,drilling,simple exploration and other methods,this project analyzed and evaluated the engineering geological conditions.The results showed that the whole project was divided into five types of engineering geological areas,including coastal plain area with depressions between platforms,first-class platform,second-class platform,third-class platform,and fourth-class platform.The special rock and soil along the project were mainly soft soil,boulder,high liquid limit soil,and artificial fill.Soft soil was the potential soft foundation.High liquid limit soil showed expansibility.Taking boulder as pile end bearing stratum would lead to pile foundation instability.They should be paid attention in design.The development of voids can easily lead to weakening of bearing capacity of the pile foundation and instability of the bridge.It was suggested that leakage-proof measures such as concrete pouring should be taken.