ICS 93.020 CCS P 22 DB42 湖北省 地方标准 DB42/T 159—2024 代替 DB42/T 159 —2012 基坑工程技术规程 Technical specification for excavation engineering 2024 - 09 - 22发布 2025 - 01 - 22实施 湖北省住房和城乡建设厅 湖北省市场监督管理局 联合发布 DB42/T 159—2024 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 ................................ ................................ ......... 2 4 符号 ................................ ................................ ............... 4 4.1 作用与作用效应、抗力、材料性能 ................................ ................. 4 4.2 几何参数 ................................ ................................ ....... 5 4.3 计算系数 ................................ ................................ ....... 5 5 总则 ................................ ................................ ............... 5 6 基本规定 ................................ ................................ ........... 6 7 工程勘察与环境调查 ................................ ................................ . 9 7.1一般规定 ................................ ................................ ....... 9 现场勘探与测试 ................................ ................................ 10 室内试验 ................................ ................................ ...... 11 勘察成果 ................................ ................................ ...... 12 环境调查 ................................ ................................ ...... 12 8 支护结构设计 ................................ ................................ ...... 13 支护结构类型和适用条件 ................................ ........................ 13 支护结构侧向压力计算 ................................ .......................... 14 支护结构分析与基坑稳定性验算 ................................ .................. 18 排桩支护结构 ................................ ................................ .. 25 双排桩支护结构 ................................ ................................ 29 型钢水泥土搅拌墙 ................................ .............................. 32 地下连续墙 ................................ ................................ .... 35 围筒式支护结构 ................................ ................................ 37 锚杆与内支撑结构 ................................ .............................. 38 支护结构与主体结构相结合及逆作法 ................................ ............. 49 水泥土挡墙 ................................ ................................ ... 51 土钉墙与复合土钉墙 ................................ ........................... 55 被动区加固 ................................ ................................ ... 58 放坡开挖 ................................ ................................ ..... 60 9 地下水控制 ................................ ................................ ........ 61 一般规定 ................................ ................................ ...... 61 明排 ................................ ................................ .......... 62 隔渗 ................................ ................................ .......... 62 管井降水 ................................ ................................ ...... 63 DB42/T 159 —2024 II 轻型井点降水 ................................ ................................ ... 64 回灌 ................................ ................................ ..... 64 特殊含水层地下水控制 ................................ ........................... 64 10 施工与检测 ................................ ................................ ........ 65 一般规定 ................................ ................................ ...... 65 专项施工方案 ................................ ................................ .. 65 排桩施工 ................................ ................................ ...... 66 咬合桩施工 ................................ ................................ .... 67 钢板桩施工 ................................ ...............................