赣南山区高速公路边坡截排水技术探讨
发布时间：2018-11-11 07:36
【摘要】：山区公路边坡截排水系统对于保障路基边坡稳定性具有十分重要的作用。以江西安远~定南高速公路为例,对赣南山区高速公路边坡截排水技术进行探讨。边坡排水工程可分为边坡截水和边坡排水:(1)地表截水措施常见为截水沟和阻水堤,地下截水措施可采用充气截排水;(2)挖方路段地表排水设施主要由截水沟、平台沟(急流槽)及边沟组成,边沟下设纵向盲沟,填方路段主要由排水沟和涵洞组成,填挖方段坡面常设置泄水孔排除地下水,排水洞、水平排水孔、盲沟及竖井皆可应用。截排水的目的是确保路基边坡的稳定,针对赣南地区边坡5种常见的破坏模式,即沿原有结构面滑动、沿顶部拉裂滑动、土体拉裂-崩塌、圆弧形滑动、表面冲刷,分析水在破坏过程中所起的作用,提出相应的截排水对策。以区域工程地质条件为基础,结合赣南地区降雨量大的特点,对常用的设计方案提出3点优化建议:(1)变坡点及弯道附近,将边沟适当加宽或增设横向排水管,并增加槽身粗糙度;(2)土质高边坡地下水丰富路段增设砂井,采用泄水孔穿连砂井;(3)对多节理裂隙岩质破碎路段进行注浆处理,将泄水孔加密,并使与节理裂隙面大角度相交,以21°~36°为最佳。
[Abstract]:The drainage system of highway slope in mountainous area plays an important role in ensuring the stability of roadbed slope. Taking Anyuan-Dingnan Expressway in Jiangxi Province as an example, the technique of cutting and drainage of expressway slope in Gannan Mountain area is discussed. Slope drainage works can be divided into slope interception and slope drainage: (1) the surface water interception measures are commonly used as gully and embankment; (2) the surface drainage facilities of the excavated section are mainly composed of intercepting gullies, platform trenches (jet channels) and edge ditches. There are longitudinal blind ditches under the edge trenches, and the fill sections are mainly composed of drainage ditches and culverts. Drainage holes are often set up on the slope of the fill and excavation sections to remove groundwater. Drainage holes, horizontal drainage holes, blind ditches and shafts can be used. The purpose of intercepting drainage is to ensure the stability of roadbed slope. In view of the five common failure modes of slope in south Jiangxi province, that is, sliding along the original structural plane, sliding along the top of the structure, pulling and collapsing of soil, arc sliding, and surface scouring, The function of water in the process of destruction is analyzed, and the corresponding countermeasures of intercepting and drainage are put forward. Based on the regional engineering geological conditions and the characteristics of heavy rainfall in south Jiangxi, three optimization suggestions are put forward for the commonly used design schemes: (1) widen the side gully properly or add the lateral drainage pipe in the vicinity of the variable slope point and the bend. And increase the roughness of the groove body; (2) the sand wells are added in the section of rich underground water on the high soil slope, and the drainage holes are used to penetrate the sand wells; (3) grouting treatment is carried out on the broken section of multi-joint fractured rock, the drainage hole is infilled and the joint fissure surface is intersected at a large angle, 21 掳~ 36 掳is the best.
【作者单位】： 江西省高速公路投资集团有限责任公司;中国地质大学(武汉)工程学院;
【基金】：江西省交通运输厅科技计划项目,项目编号2015c0026
【分类号】：U417.3
本文编号：2324190
[Abstract]:The drainage system of highway slope in mountainous area plays an important role in ensuring the stability of roadbed slope. Taking Anyuan-Dingnan Expressway in Jiangxi Province as an example, the technique of cutting and drainage of expressway slope in Gannan Mountain area is discussed. Slope drainage works can be divided into slope interception and slope drainage: (1) the surface water interception measures are commonly used as gully and embankment; (2) the surface drainage facilities of the excavated section are mainly composed of intercepting gullies, platform trenches (jet channels) and edge ditches. There are longitudinal blind ditches under the edge trenches, and the fill sections are mainly composed of drainage ditches and culverts. Drainage holes are often set up on the slope of the fill and excavation sections to remove groundwater. Drainage holes, horizontal drainage holes, blind ditches and shafts can be used. The purpose of intercepting drainage is to ensure the stability of roadbed slope. In view of the five common failure modes of slope in south Jiangxi province, that is, sliding along the original structural plane, sliding along the top of the structure, pulling and collapsing of soil, arc sliding, and surface scouring, The function of water in the process of destruction is analyzed, and the corresponding countermeasures of intercepting and drainage are put forward. Based on the regional engineering geological conditions and the characteristics of heavy rainfall in south Jiangxi, three optimization suggestions are put forward for the commonly used design schemes: (1) widen the side gully properly or add the lateral drainage pipe in the vicinity of the variable slope point and the bend. And increase the roughness of the groove body; (2) the sand wells are added in the section of rich underground water on the high soil slope, and the drainage holes are used to penetrate the sand wells; (3) grouting treatment is carried out on the broken section of multi-joint fractured rock, the drainage hole is infilled and the joint fissure surface is intersected at a large angle, 21 掳~ 36 掳is the best.
【作者单位】： 江西省高速公路投资集团有限责任公司;中国地质大学(武汉)工程学院;
【基金】：江西省交通运输厅科技计划项目,项目编号2015c0026
【分类号】：U417.3
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