内容简介
DB11/T 489—2016 备案号∶ J13247一2016建筑基坑支护技术规程
Technical specification for retaining and protecting of building foundation excavation （报批稿）
2016-12-01实施
2016-08-10发布
目 次
1 总则...........................................................................................................................................1
2 术语和符号...............................................................................................................................2
2.1 术语.......................................................................................................................................2
2.2 符号......................................................................................................................................3
3 基本规定...................................................................................................................................5
3.1 设计原则...............................................................................................................................5
3.2 勘察要求...............................................................................................................................7
3.3 支护结构选型 .......................................................................................................................8
3.4 水平荷载...............................................................................................................................9
3.5 质量检测.............................................................................................................................14
4 放坡.........................................................................................................................................15
4.1 放坡设计.............................................................................................................................15
4.2 放坡施工.............................................................................................................................15
4.3 质量检测.............................................................................................................................15
5 支挡式结构.............................................................................................................................17
5.1 一般规定............................................................................................................................17
5.2 结构分析............................................................................................................................17
5.3 基坑稳定性验算 .................................................................................................................18
5.4 双排桩设计.........................................................................................................................21
5.5 截面承载力计算 .................................................................................................................23
5.6 锚杆计算.............................................................................................................................24
5.7 构造要求.............................................................................................................................26
5.8 施工.....................................................................................................................................29
5.9 质量检测.............................................................................................................................31
6 土钉墙.....................................................................................................................................33
6.1 一般规定.............................................................................................................................33
6.2 设计.....................................................................................................................................33
6.3 施工....................................................................................................................................38
6.4 质量检测.............................................................................................................................41
7 地下水控制.............................................................................................................................42
7.1 一般规定............................................................................................................................42
7.2 截水.....................................................................................................................................43
7.3 降水.....................................................................................................................................43
7.4 集水明排.............................................................................................................................50
7.5 回灌.....................................................................................................................................50
8 基坑开挖.................................................................................................................................51
8.1 一般规定.............................................................................................................................51
8.2 开挖.....................................................................................................................................51
8.3 地下水控制.........................................................................................................................51
8.4 封底及回填.........................................................................................................................52
9 监测.........................................................................................................................................53
9.1 一般规定.............................................................................................................................53
9.2 监测项目.............................................................................................................................53
9.3 巡视检查.............................................................................................................................54
9.4 监测点布置.........................................................................................................................55
9.5 监测频率.............................................................................................................................56
9.6 监测报警.............................................................................................................................57
9.7 监测成果.............................................................................................................................58
附录 A 基坑支护设计文件内容.................................................................................................60
附录 B 锚杆钢腰梁按简支梁考虑时选型参考表 .....................................................................63
附录 C 渗透稳定性验算.............................................................................................................64
本规程用词说明.............................................................................................................................66
引用标准名录.................................................................................................................................67
条文说明.........................................................................................................................................68