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Developmental Study of Settlement Measuring System using Permanent Magnets and Magnetic Sensor

永磁体和磁传感器沉降测量系统的研制

基本信息

批准号：
04555122
负责人：
KUSUMI Harushige
金额：
$ 3.46万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

When articial island are constructed, they are subject to surface settlement, which is the resultant sum of the consolidation strata, many of which seem differ in character. When these strata are soft and thick, or heavily loaded, it becomes very difficult to estimate how much settlement will eventually take place, and over how long a period. For the estimate to be accurate, the settlement characteristics of each layr must be first determinded.For this purpose, the authors have investigated a new method of measuring settlement, based on two unique principles. One principle is the application of a permanent magnet as an indicator of settlement, and the other is the exploitation of a semiconductor, magnetro resistance elements for detecting the magnetic fields. In advance with the observation, the magnets are forced into the earth, being pushed out through the bore hole casing by the oil jack at suitable depths and intervals. The small aized magneto resistance element is essential to the practicality and efficiency of this method.The magnetic apparatus manufactured for this project appears to be very effective in measuring settlement. The method that it makes possible is distinguished over other methods by the following advantages.1. Many obsevation points, at optional depths and relative intervals, can be set in one bore hole.2. Accuracy of measurement is of the order of 1 mm.3. Semi-permanent observation is possible and anticipated.4. The apparatus can be manufactured easily and economically, and is light in weight and compact.In the field examinations, the entire process always ran smoothly and has produced very favorable results.From the results, it must be conciuded that reclamation on so large a scale gives rise to consolidation in the diluvium strata.

人工岛在建造过程中，其表面沉降是固结地层的总和，其中许多固结地层的性质似乎不同。当这些地层又软又厚或负载很重时，就很难估计最终会发生多少沉降以及沉降时间有多长。为了准确地估算沉降，必须首先确定各层的沉降特性，为此，作者研究了一种新的沉降测量方法，该方法基于两个独特的原理。一个原理是应用永磁体作为沉降指示器，另一个原理是利用半导体磁阻元件来检测磁场。在观测之前，磁铁被压入地下，由油压千斤顶以适当的深度和间隔从钻孔套管中推出。小型磁阻元件是该方法实用性和有效性的关键，为此研制的磁测仪在沉降测量中取得了良好的效果。该方法，它使可能是区别于其他方法由以下几点。1.在一个钻孔内可设置多个观测点，观测深度和相对间距可任意选择。测量精度为1毫米的顺序。3.半永久性观察是可能的，也是预期的。该仪器制造简单、经济、重量轻、结构紧凑，在现场试验中，整个过程一直很顺利，取得了很好的效果，从结果可以看出，如此大规模的填海引起了洪积层的固结。