风化花岗岩地区山间小微冲沟部位土质边坡支护设计  

Design of Soil Slope Support for Small and Micro Erosion Gullies in Weathered Granite

作　　者：周兴龙 周丽红 ZHOU Xinglong;ZHOU Lihong(Guangdong Engineering Investigation Institute,Guangzhou 510510;Guangzhou Jintu Geotechnical Engineering Co.Ltd.,Guangzhou 510510)

机构地区：[1]广东省工程勘察院,广州510510 [2]广州金土岩土工程技术有限公司,广州510510

出　　处：《土工基础》2023年第4期635-639,645,共6页Soil Engineering and Foundation

摘　　要：风化花岗岩地区山间小微冲沟部位,因位于地形上的凹部,风化土层的厚度一般较大,含水量稍高于周边土层,较周边土层更为软弱、特殊。对此区域土质边坡的支护设计需重点对待,必要时应进行特殊加强处理。通过工程实践,介绍了支护设计时可供参考的几条经验和教训,①注意核对勘察基础数据的准确性和全面性。边坡山体一般植被发育,人员通行困难,测量仪器信号弱,钻探难度大,易产生地形测量误差大、地质勘探难度大等客观事实,从而导致忽略了重要的地质信息,应重视地形的复核工作及微地貌对地质条件的影响;②注重信息法施工和动态设计。根据现场实际情况,及时有效地调整支护设计方案,对小微冲沟部位的土质边坡,必要时可通过网喷混凝土、注浆、深层泄水孔等措施加强支护。The soil properties of the small and micro erosion gullies in the mountain areas in the weathered granite soils are generally softer and more special than those of the surrounding soil layers.The support design of the soil slope in these gullies should be focused on,and special strengthening should be performed if it is necessary.Throughout the engineering practice,this paper introduces several case histories that can be used for the reference in support design.First,pay attention to checking the accuracy and comprehensiveness of the basic survey data,especially the review of topography and the influence of micro-topography on geological conditions.The second is to pay attention to the construction and dynamic design of the information method.According to the actual conditions on the site,timely and effectively adjust the support design plan.For the soil slope at the position of the small and micro erosion gullies,if it is necessary,concrete shotcrete,grouting,and deep drainage methods can be used.Measures such as sweep holes to strengthen support.

关 键 词：花岗岩 小微冲沟 边坡 支护 

分 类 号：P642[天文地球—工程地质学]