JGJ94-2008：建筑桩基技术规范

JGJ94-2008······1

1 总则······10

2 术语、符号······11

2.1 术语······11

2.2 符号······12

3 基本设计规定······15

3.1 一般规定······15

3.2 基本资料······18

3.3 桩的选型与布置······20

3.4 特殊条件下的桩基······23

3.5 耐久性规定······25

4 桩基构造······27

4.1 基桩构造······27

4.2 承台构造······31

5 桩基计算······35

5.1 桩顶作用效应计算······35

5.2 桩基竖向承载力计算······36

5.3 单桩竖向极限承载力······39

5.4 特殊条件系桩基竖向承载力验算······51

5.5 桩基沉降计算······58

5.6 软土地基减沉复合疏桩基础······65

5.7 桩基水平承载力和位移计算······67

5.8 桩身承载力与裂缝控制计算······73

5.9 承台计算······79

6 灌注桩施工······92

6.1 施工准备······92

6.2 一般规定······93

6.3 泥浆护壁成孔灌注桩······95

6.4 长螺旋钻孔压灌桩······100

6.5 沉管灌注桩和内夯沉管灌灌注桩······102

6.6 干作业成孔灌注桩······106

6.7 灌注桩后注浆······108

7 混凝土预制桩与钢桩施工······111

7.1 混凝土预制桩的制作······111

7.2 混凝土预制桩的起吊、运输和堆放······113

7.3 混凝土预制桩的接桩······114

7.4 锤击沉桩······115

7.5 静压沉桩······118

7.6 钢桩（钢管桩、H型桩及其他异型钢桩）施工······121

8 承台施工······124

8.1 基坑开挖和回填······124

8.2 钢筋和混凝土施工······124

9 桩基工程质量检查和验收······125

9.1 一般规定······125

9.2 施工前检验······125

9.3 施工检验······125

9.4 施工后检验······126

9.5 基桩及承台工程验收资料······127

附录A 桩型与成桩工艺选择······129

附录B 预应力混凝土空心桩基本参数······132

附录C 考虑承台（包括地下墙体）、基桩协同工作和土的弹性抗力作用计算受水平荷载的基桩······136

附录D Boussinesq（布辛奈斯克）解的附加应力系数α、平均附加应力系数α······154

附录E 桩基等效沉降系ψe计算参数······167

附录F 考虑桩径影响的Mindlin（明德林）解应力影响系数······175

附录G 按倒置弹性地基梁计算砌体墙下条形桩基承台梁······215

附录H 锤击沉桩锤重的选用······218

本规范用词说明······219

附:条文说明······220

1 总则······224

2 术语、符号······226

2.1 术语······226

2.2 符号······226

3 基本设计规定······227

3.1 一般规定······227

3.2 基本资料······240

3.3 桩的选型与布置······240

3.4 特殊条件下的桩基······244

3.5 耐久性规定······248

4 桩基构造······249

4.1 基桩构造······249

4.2 承台构造······250

5 桩基计算······255

5.1 桩顶作用效应计算······255

5.2 桩基竖向承载力计算······255

5.3 单桩竖向极限承载力······262

5.4 特殊条件系桩基竖向承载力验算······274

5.5 桩基沉降计算······280

5.6 软土地基减沉复合疏桩基础······298

5.7 桩基水平承载力和位移计算······301

5.8 桩身承载力与裂缝控制计算······304

5.9 承台计算······311

6 灌注桩施工······317

6.2 一般规定······317

6.3 泥浆护壁成孔灌注桩······317

6.4 长螺旋钻孔压灌桩······318

6.5 沉管灌注桩和内夯沉管灌灌注桩······319

6.6 干作业成孔灌注桩······319

6.7 灌注桩后注浆······319

7 混凝土预制桩与钢桩施工······321

7.1 混凝土预制桩的制作······321

7.3 混凝土预制桩的接桩······321

7.4 锤击沉桩······322

7.6 钢桩（钢管桩、H型桩及其他异型钢桩）施工······322

8 承台施工······325

8.1 基坑开挖和回填······325

8.2 钢筋和混凝土施工······325

9 桩基工程质量检查和验收······326