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RESEARCH ON THE REINFORCED EARTH METHOD FOR MAN-MADE SLOPE STABILITY DURING EARTHQUAKE AND HEAVY RAINFALL

地震和强降雨条件下人工边坡稳定性加筋土法研究

基本信息

批准号：
11650505
负责人：
OKIMURA Takashi
金额：
$ 1.34万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

In order to obtain an adequate stability on a filled slope during heavy rainfall and earthquake, the effect of soil improvement for soft ground and the use of geo-textile was set at a filled slope are examined at the trial embankment. Obtained results are as follows :1) The displacement of the filled slope was measured along horizontal and vertical measturing line, respectively. The maximum displacement along horizontal line was appeared at the basement of the embankment, and the measured value at the reinforced slope was 5 mm less in comparison to the non-reinforced one. The maximum settlement was found at the shoulder of the filled slope. The reason is a future issue.2) The tensile strength of the inserted geo-textile was measured in situ. That value was very small compared to the strength of the geo-textile found in the laboratory. Therefore effective protection to the deformation will be expected in the future.3) The dense electric prospecting was useful to know the depth and wide of a soft ground. However, no relationships were found between the obtained data and the ground layer boundary obtained by a boring examination and the Swedish sounding.4) In the case of the ground improvement by using cement, cementation processes were measured by dense electric prospecting, and the area of an improved ground can be also obtained by this method. However, the area can be grasped by using some other methods.5) By the results of the dynamic analysis, the effect of the geo-textile was not so large on the response characteristics of the embankment. However, it contributes to decrease the shear strain of the slope surface. Therefore the geo-textile has an effect to decrease the deformation of the filled slope.

为了在强降雨和地震期间获得足够的稳定性，在试验路堤上检查了软土地基的土壤改良效果和土工织物的使用。1）分别沿沿着测线和垂直测线对填土边坡的位移进行了观测。水平位移最大值出现在路基基底处，加筋边坡处的实测值比未加筋边坡处小5mm。最大沉降出现在填方边坡的路肩处。2）对土工织物的抗拉强度进行了现场测试。与实验室中发现的土工织物的强度相比，该值非常小。3）密电勘探对确定软土地基的深度和范围具有重要意义。然而，通过钻孔检查和瑞典探测获得的地层边界与所获得的数据之间没有关系。4）在使用水泥的地基加固的情况下，通过密集的电勘探测量胶结过程，并且通过这种方法也可以获得加固地基的面积。但是，该区域可以通过其他方法来掌握。5）从动力分析结果来看，土工织物对路堤响应特性的影响并不是很大。但是，它有助于降低坡面的剪应变。因此，土工织物具有减小填土边坡变形的作用。