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山区高速公路边坡滑坡处治探讨

2018-07-18全强明

价值工程 2018年16期

全强明

摘要:山区高速公路的高填、深切路段较多,且受小区域气候条件影响明显,施工自然条件和环境复杂,特别是高切方边坡施工要做到防护紧跟,监测及时,对施工方案及时进行动态优化,并充分利用专业的地质勘察,确定高大边坡的综合处治方案,达到一次根治,不留后患的目标,为施工安全和通车运营安全打下良好基础。结合本人参建的湖南省张桑高速公路第三合同段一处路堑高边坡,谈谈边坡处治方案的确定及其实施的具体流程。

Abstract: There are many high-filled and deep-cut sections in mountainous highways, which are affected by the climatic conditions in a small area. The natural conditions and environment of the construction are complex. In particular, the construction of high-cutting side slopes should be protected closely and monitored in a timely manner. The plan should be dynamically optimized in a timely manner, and the professional geological survey should be fully utilized to determine the comprehensive treatment plan of the high slopes, to achieve a radical cure, leaving no future problems, thus laying a good foundation for construction safety and opening operation safety. Based on a high slope of the third contract section of Zhangsang Expressway in Hunan Province, this paper discussed the determination of the treatment plan for the slope and the specific procedures for its implementation.

关键词: 山区高速公路;边坡滑坡;处治

Key words: mountainous expressway;slope landslide;treatment

中图分类号:U418.5+2 文献标识码:A 文章编号:1006-4311(2018)16-0102-03

1 工程概况

张桑高速公路第3合同段段高边坡ZK20+188-ZK20+408,总长220m,中线最大挖方深度23.6m,位于ZK20+330处,开挖后左侧将形成约51.7m的边坡。边坡开挖过程中,监测突然显示,最大监测点位移约1.2mm/d,极不稳定,导致边坡坡顶开口线外出现较宽裂缝,存在坍塌隐患。经会同业主单位、设计单位和监理单位共同现场踏勘,优化调整方案:①粘土或水泥浆封闭裂缝。②将第一级边坡坡率由1:0.75调整为1:1;第二、三级边坡坡率由1:1调整为1:1.25,第四级边坡1:1和第五级边坡1:1.25调整为1:1.5。③第一、二级边坡防护形式维持不变,即挂网客土喷播植草;三、四级边坡防护形式变更为锚杆锚墩防护+挂网客土喷播植草;五级边坡采用挂网客土喷播植草。④在第二、三、四级坡面增设长9m的仰斜式泄水孔,间距为6m,增设坡顶截水沟及截水盲沟,每级边坡平台处设置平台截水沟。

施工单位在变更方案批复后,按照确定的施工组织计划安排施工,并及时与监测单位对接跟踪边坡位移情况。……

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