DB43/T 3316—202543 湖 南 省 地 方 标 准ICS 93.080.01 CCS P 66 发 布 湖南省市场监督管理局2025-08发布-15 2025-11实施-15湿热地区路基拓宽技术规范 Technical specification for subgrade widening in humid and hot areasDB43/T 3316—20 25 I 目 次 前言 ································································································ ························ Ⅲ 1 范围 ································································································ ····················· 1 2 规范性引用文件 ································································································ ······ 1 3 术语和定义 ································································································ ············ 1 4 符号和缩略语 ································ ········································································· 2 5 总体要求 ································ ································ ··············································· 2 6 既有路基调查、评价与病害处治 ································ ················································· 2 6.1 路基及周边环境调查 ································ ·························································· 2 6.2 既有路基评价 ································································································ ··· 3 6.3 既有路基病害处治 ····························································································· 4 7 路基拓宽设计与施工 ································ ································································ 5 7.1 一般规定 ································································································ ········· 5 7.2 准备工作 ································································································ ········· 6 7.3 地表处理 ································································································ ········· 6 7.4 坡面处理 ································································································ ········· 6 7.5 一般填方路基拓宽 ································ ····························································· 7 7.6 高路堤与陡坡路堤拓宽 ································ ······················································· 9 7.7 软土地基上的路基拓宽 ································ ······················································· 9 7.8 特殊路基拓宽 ································································································ · 11 7.9 挖方路基拓宽 ································································································ · 11 7.10 路床拓宽 ································································································ ····· 11 7.11 土工合成材料铺设 ································ ························································· 11 8 支挡、防护与防排水 ································ ······························································ 12 8.1 支挡结构物 ································································································ ···· 12 8.2 路基防护 ································ ······································································· 12 8.3 改扩建路基防排水 ··························································································· 12 9 环保与水土保持 ································ ································ ···································· 14 10 路基变形监测································································ ······································ 14 附录A （资料性）既有路基检测评价方法及评价表··························································· 17 A.1 既有路基检测评价方法及评价表 ········································································· 17 附录B（资料性）沉降观测记录表 ················································································· 18 附录C（资料性）剖面沉降观测记录表 ··········································································· 19 DB43/T 3316—20 25 DB43/T 3316—20 25 III 前 言 本文件按照 GB/T 1.1—2020 《标准