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.

为了使填方边坡在强降雨和地震过程中获得足够的稳定性，在试验路堤上对填方边坡设置软土地基改良和土工织物的使用效果进行了检验。所得结果如下： 1）分别沿水平和垂直测线测量填方边坡的位移。沿水平线的最大位移出现在路堤的基底处，加筋边坡的实测值比未加筋边坡的测量值减少了5 mm。最大沉降出现在填方坡肩处。原因是未来的问题。2）现场测量了插入的土工织物的拉伸强度。与实验室中发现的土工织物的强度相比，该值非常小。因此，未来有望对变形进行有效的保护。3)密集电法勘探有助于了解软土地基的深度和宽度。然而，所获得的数据与通过钻孔检查和瑞典测深获得的地层边界之间没有发现任何关系。 4）在使用水泥改良地基的情况下，通过密集电探测量胶结过程，并得到面积通过这种方法也可以获得改善的地面。但也可以通过其他方法来掌握该面积。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大。然而，它有助于减少坡面的剪应变。因此土工布具有减少填方边坡变形的作用。