Design
considerations
GRID SPACING AND NUMBER OF DROPS
SURFACE STABILIZING LAYER
MULTIPLE PASSES
论 介文 绍绪 论
研 预究 先背 评景 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
论 介文 绍绪 论
研 预究 先背 评景 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
method specifications
The contractor’s primary duties： tamper
Providing a tamper of the prescribed size
safety
Maintaining safety at the job site including a safe working distance
records
Keeping records of the number of drops, the number of passes
schedule
Maintaining production to meet the schedule assigned for the project.
论 介文 绍绪 论
研 预 先 评 估 预究 先背 评景 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
APPLIED ENERGY REQUIREMENTS SELECTION OF TAMPER AND DROP HEIGHT
AREA TO DENSIFY
Close coordination between the design engineer and the person writing the specifications is essential！
other equipment
Providing sufficient cables, swivels, and other equipment
equipment
Providing the proper equipment with a single cable to raise and drop the tamper
地基处理强夯法（动力固结法）
我们毕业啦
其实是答辩的标题地方
汇报人 指导老师
Introduction Preliminary evaluation Design considerations Contracing procedures
CO N T E N T
Constraction monitoring
MULTIPLE PASSES
The number of drops that can be applied at a grid point location at onetime could be limited by the depth of the crater.
SURFACE STABILIZING LAYER
Energy application Equipment required
Work area General description
论 介文 绍绪 论
研 预究 先背 评景 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
performance specifications
A drop point spacing of 1.5to 2.5 times the diameter or width of the tamper is common.
论 介文 绍绪 论
研 预究 先背 评景 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
performance specifications
If the design agency and/or their consultant do not have expertise in dynamic compaction, a performance type contract should be selected for the work.
Lighter tampers and smaller drop heights result in depths of improvement on the order of 3.0 to 4.6 m. Heavier tampers and greater drop heights result in improvements on the order of 6.1 to 9.1 m
Preparation of a method specification requires knowledge of the various facets of dynamic compaction either within the design agency or by their consultants.
AREA TO DENSIFY
Dynamic compaction is generally completed over an area larger than the plan area of the embankment or the loaded area.
GRID SPACING AND NUMBER OF DROPS
论 介文 绍绪 论
研 预究 先背 评景 估
研计 设 究考 方虑 法
研投 招 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
method specifications
Payment Recordkeeping Required testing Backfill and ground levelction
介绍
预先评估
设计考虑
招投标程序
建设监管
强夯调整
“
The mass of the tampers generally ranges from 5.4 to 27.2 Mg, and drop heights range from 12.2to 30.5 m.
Defining the extent of the area to be improved.
A
requirements
Listing the minimum prequalification requirements
论 介文 绍绪 论
研 预究 先背 评景 估
研计 设 究考 方虑 法
研投 招 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
研 介 究 绍 背论 景 论 介文 绍绪
预 研 究 背 景 预先 先评 评估 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
DEVELOPMENT OF DESIGN PLAN
1.Selection of the tamper mass and drop height to correspond to the required depth of improvement. 2.Determination of the applied energy to be used over the project site to result in the desired improvement. 3.Selection of the area to densify. 4.Determination of the grid spacing and number of phases. 5.Establishing the number of passes. 6.The need for a surface stabilizing layer.
1 2 3 4
Categorize soil type: (1) Site Investigation (2) General Description of Soil Categories Assess site restraints: (1) Ground Vibrations (2) Lateral Ground Displacements (3) High Water Table (4) Presence of Hard or Soft Layers Determine design requirements: (1) Tolerable Settlement (2) Minimum Soil Property (3) Depth Of Improvement Limitation Estimate costs: (1)Dynamic Compaction Costs (2)Alternate Ground Improvement Techniques
论 介文 绍绪 论
研 预究 先背 评景 估
设计 研 究考 方虑 法
招投 研 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
APPLIED ENERGY REQUIREMENTS
论 介文 绍绪 论
研 预究 先背 评景 估
研计 设 究考 方虑 法
研投 招 究标 结程 果序 问建 题设 讨监 论管 论文 强总 夯结 调整
Site preparation
Recordkeeping
Work area
Prequalification
Project description
Required improvement