复杂地质条件下山区公路工程勘察实践

Practice of highway engineering survey in mountainous area under complex geological conditions

白云区至修文县道路工程为典型的山区道路工程,设置有大桥、长隧道、深路堑、高路堤等,工程沿线地形复杂,岩溶、采空区、滑坡、断层、红黏土、软土等不良地质和特殊性岩土发育,勘察过程中采用了地质调绘、物探(高密度电法、地震、波速测试)、钻探、坑探(重点边坡位置)、原位测试(标准贯入、重型动力触探)等与室内试验相结合的综合手段进行,勘察工作的重点难点及应对措施针对性强,对岩溶、采空区等不良地质,可加强地质调查及物探工作,对红黏土层,应注意往下由硬塑变软可塑的特性、加强室内剪切试验,并根据不同构筑物特点进行了工程地质分析评价。

The road project from Baiyun District to Xiuwen County is a typical mountain road project,with bridges,long tunnels,deep cuttings,high emban kments,etc.,the terrain along the project is complex,and karst,goaf,landslide,fault,red clay,soft soil and other unfavorable geology and special rock and soil are developed,geological mapping,geophysical prospecting(high-density electrical method,earthquake,wave velocity test),drilling,test pit(key slope location),in-situ test(standard penetration,heavy dynamic penetration)and indoor test were used in the survey,the key points,difficulties and countermeasures of the survey work are highly targeted.For unfavorable geology such as karst and goaf,geological survey and geophysical exploration can be strengthened.For red clay layer,attention should be paid to the characteristics of changing from hard plastic to soft plastic,and indoor shear test should be strengthened,the engineering geological analysis and evaluation are carried out according to the charac teristics of different structures.