Study on the unsteady excavation of submarine soft rock mass

海底软岩体非稳定开挖研究

基本信息

批准号：
03650410
负责人：
MURO Tatsuro
金额：
$ 0.13万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650410/
关键词：
soft rock excavation mechanism unsteady excavation rake angle vertical penetration force shear mechanism grab bucket F.E.M. analysis 作業効率

项目摘要

The mechanism of excavation experienced in some excavators, for example grab bucket, clamshell bucket etc, is mainly occupied by unstable excavation, in which the excavating depth is varied with the progress of excavation. Therefore the experiments on the unstable excavation were carried out for soft rock mass and the basic properties were clarified with some theoretical or experimental methods. At first the relationship between the forces applied to cutting edge and the displacements were analysed based on experimental results and several factors affecting the relations were investigated. Then the excavated rock volume was evaluated based on the results of the previous consideration. FEM analysis by use of elasto-plastic constitutive equations were also carried out in order to compare with the experimental results and to check the failure pattern of rock ground in the vicinity of the cutting edge. Finally these research results are applied to a real excavator to check the appropriateness of this study. Parameters mainly used in this study are rake angle, excavating distance, vertical penetration force and shear strength of soft rock. The para-meters except the shear strength can be obtained from the size of the excavator. The main targets of this study were therefore (1) to give formula on excavating resistance and the locus of cutting edge on the basis of the input information about the shear strength, (2) to check the appropriateness of the formula by applying them to a real excavator.

一些挖掘机的挖掘机构，例如抓斗、蛤壳式铲斗等，主要是不稳定挖掘，挖掘深度随着挖掘进度而变化。为此，针对软岩体进行了失稳开挖试验，并通过一定的理论或实验方法明确了软岩体的基本性质。首先根据实验结果分析了施加在切削刃上的力与位移之间的关系，并研究了影响这种关系的几个因素。然后根据前面考虑的结果评估开挖岩石体积。还利用弹塑性本构方程进行了有限元分析，以便与实验结果进行比较并检查切削刃附近岩石地面的破坏模式。最后将这些研究结果应用到真实的挖掘机上来检验本研究的适当性。本研究主要使用的参数有前角、开挖距离、垂直贯入力和软岩抗剪强度。除剪切强度外的参数可由挖掘机尺寸获得。因此，本研究的主要目标是（1）根据输入的抗剪强度信息给出挖掘阻力和切削刃轨迹的公式，（2）通过将其应用于实际情况来检查公式的适当性。真正的挖掘机。