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重錘落下による衝撃力の発生機構と地盤の締固め機構

落锤冲击力产生机制和土壤压实机制

基本信息

批准号：
06750532
负责人：
大島昭彦
金额：
$ 0.58万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Encouragement of Young Scientists (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06750532/
关键词：
衝撃荷重締固め加速度現場実験砂質土

项目摘要

土の動的な締固め方法に重錘落下による衝撃締固めがある.この手法は一般に,打撃エネルギーで管理されるが,これを構成する重錘質量,落下高,打撃回数が締固めに与える影響水準は同一ではなく,その締固め機構は必ずしも明確にされていない.本研究は,重錘が地盤に与える衝撃力に着目し,地盤打撃時に重錘に生じる衝撃加速度を測定した.まず土の種類,地盤密度と重錘底面形状が加速度波形,重錘貫入量および衝撃応力の減衰過程に与える影響を室内実験により調べ,次に小型,中型,大型,超大型(質量1.25kg〜25t)の重錘を用いた現場実験を行い,重錘規模の違いが加速度波形および地盤の締固めに及ぼす影響を調べた.まず室内実験から,(1)底面形状が平底以外の重錘では地盤面の膨張量が大きく,平底が締固めには最も有効であること,(2)加速度波形は土の種類によらず2つのピークを持ち,単位面積当たりの重錘質量に依存し,これが大きいほど加速度が小さく,衝撃持続時間が長く,第2ピークが卓越すること,(3)地盤密度の増加とともに加速度波形は放物線形に単純化すること,現場実験から,(4)小型〜超大型重錘による加速度波形は室内実験結果と同様に,単位面積当たりの重錘質量に依存するが,重錘規模が大きいほど衝撃持続時間が長く,第1ピークが卓越すること,(5)加速度の第1ピークは地盤の弾性挙動が主体となり,締固めには有効でないが,第2ピークが卓越する場合には地盤の塑性挙動が主体となり,締固めには有効となること,(6)最大加速度,最大打撃応力および重錘貫入量は,重錘規模によらず単位面積当たりの重錘質量と衝突速度を用いて表現できること,(7)室内,現場実験ともに地盤の締固め程度を表す重錘貫入量は運動量に比例することから,地盤の締固めは運動量に依存することが見出された.

The method of soil consolidation is very important to improve the stability of soil. The operation of the machine is normal, and the machine must make sure that the weight of the machine is the same as that of the level. it is necessary to make sure that the weight is the same as that of the control machine. The purpose of this study is to measure the acceleration of the earth by using the force of the earth and the force of the earth. For example, the ground density, the ground density, the bottom shape, the acceleration waveform, the load, the acceleration waveform, the acceleration waveform, the acceleration In the room, (1) the bottom shape of the floor surface is too high, and the flat bottom is the most reliable. (2) the acceleration waveforms are similar to those of the earth. (2) the acceleration waveforms are similar to those of the earth, and the temperature of the plane is dependent on the weight, the acceleration is small, and the acceleration is stable for a long time. In the second stage, we have excellent performance, (3) ground density and acceleration waveforms, and (4) small to super-large heavy load acceleration waveforms, the results are the same as those in the room, and the results are the same as those in the room. The results are the same as those of the small to super-large heavy load acceleration waveform. In the first chapter, there is an excellent performance, (5) the acceleration is in the first place, the main body is in contact with each other, and the second is in line with the plastic movement of the earth. The main body is in line with the load, and there is a load in the fixture. (6) the maximum acceleration, the maximum impact force, the load load. On the surface of the heavy load, when the sudden speed of the heavy load is measured, (7) in the room, the weight of the load is measured on the table of the degree of tightness on the ground, and the ratio of the amount of load is much higher than that on the ground.