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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
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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 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.
SELECTION OF TAMPER AND DROP HEIGHT
n has been found at project sites to range from 0.3 to 0.8.
The variation in n is attributed to the: ① Efficiency of the drop mechanism of the crane. ② Total amount of energy applied. ③ Type of soil deposit being densified. ④ Presence of energy absorbing layers. ⑤ Presence of a hard layer above or below the deposit being densified. ⑥ Contact pressure of the tamper.
Introduction Preliminary evaluation Design considerations Contracing procedures
CO N T E N T
Constraction monitoring
Adjustments during dynamic compaction
AREA TO DENSIFY
Dynamic compaction is generally completed over an area larger than the plan area of the embankment or the loaded area.
介绍
预先评估
设计考虑
招投标程序
建设监管
强夯调整
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The mass of the tampers generally ranges from 5.4 to 27.2 Mg, and drop heights range from 12.2to 30.5 m.
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
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
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介 论 文 介绍 绍绪 论
预 研 究 背 景 预先 先评 评估 估
设 研 究 方 法 研计 设 究考 计 方虑 考 法 虑
招 研 究 结 果 题 讨 论 强 总 夯 结 调 研投 招 究标 投 结程 标 果序 程 序问 问建 建 题设 设 讨监 监 论管 管论 论文 文 强 总 夯 结 调整 整
Design
considerations
GRID SPACING AND NUMBER OF DROPS
SURFACE STABILIZING LAYER
MULTIPLE PASSES
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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