权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Research on Geologic Control of Slope Movements --- Analysis of Lithology and Geologic Structure of Basement Rocks

斜坡运动的地质控制研究——基岩岩性及地质结构分析

基本信息

批准号：
02640605
负责人：
FUJITA Takashi
金额：
$ 1.34万
依托单位：
Osaka Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

We have mainly investigated slope movements of Cretaceous to Neogene formations in Kinki and Shikoku areas, for example the Kobe Group and the Hokutan Group of Neogene age, and the Shimanto Belt of Cretaceous to Paleogene age. By means of image analysis of aerophotos, we have measured and analyzed many geomorphological and geological data of slope movements in the specific areas mentioned above. Particularly, we made clear the relationship between slope movements and lithology and/or geologic structure of basement rocks. The term "slope movement" means all kinds of moving phenomena of materials found on slopes, including landslides.The following geologic and geomorphologic factors are commonly pointed out as the generating factors of slope movements. (1) Many large-scale slope movements usually occur in fine clastic sediments, such as mudstone or fine tuff. This is called the lithological control. (2) The masses are mainly composed of debris and soil derived from basement rocks, and sh … More ow the secondary movement. On the other hand, new slope movements occur by artificial cutting of Slopes in order to construction of roads. (3) Generally, a sliding surface includes abundant clay minerals, such as montmorillonite, illite and chlorite, and its formation is closely connected with action of groundwater. It is difficult to analyze flow conditions of groundwater in hilly and mountain areas. (4) Many sliding masses move along the dip direction side of bedding plains of basement rocks. This is called the "Nagareban' structure type, and show the typical structural control. On the other hand, a small number of slope movements, which belong-the "Ukeban type, slide along the opposite side of the bedding plains. (5) The development of slope movements is not always concerned with faults. However, remarkable tectonic movements widely brought about weathering and fracture of rocks. This gave great influence to generation of slope movements. (6) A large number of slope movements occur on slopes with specific slope angle, namely 10ﾟ-15ﾟ in the Neogene formations and 25ﾟ-30ﾟ in precretaceous formations. These angles are small compared with slopes without slope movements, and then it is pointed out that their occurrences form gradient slopes. (7) The slope movement areas are often used as rice field or farms, because of abundant water. Less

我们主要研究了近海和四国地区白垩纪-新近纪组的斜坡运动，如新近纪的神户群和和库坦群，以及白垩纪-古近纪的岛曼托带。通过航片影像分析，对上述特定区域的大量斜坡运动地貌地质资料进行了测量和分析。特别是明确了斜坡运动与基岩岩性和地质结构的关系。“斜坡运动”是指斜坡上各种物质的移动现象，包括滑坡。以下地质地貌因素通常被认为是产生斜坡运动的因素。(1)许多大规模的斜坡运动通常发生在细碎屑沉积中，如泥岩或细凝灰岩。这就是岩性控制。(2)块体主要由来自基岩的碎屑和土壤组成，Sh…。更多的是第二乐章。另一方面，为了修路，人工切割斜坡会产生新的斜坡移动。(3)滑动面一般含有蒙脱石、伊利石、绿泥石等丰富的粘土矿物，其形成与地下水的作用密切相关。丘陵山区地下水的流动状况分析比较困难。(4)许多滑体沿基岩顺层平原的倾角方向移动。这是一种典型的构造控制类型，被称为“Nagareban”型构造。另一方面，少量的斜坡运动，属于“Ukeban”型，沿着层理平原的对侧滑动。(5)斜坡运动的发育并不总是与断层有关。然而，显著的构造运动广泛地带来了岩石的风化和破裂。这对斜坡运动的产生产生了很大的影响。(6)在特定坡角的斜坡上发生了大量的斜坡运动，即新近系为10ﾟ-15ﾟ，前寒武系为25ﾟ-30ﾟ。这些倾角与没有斜坡运动的斜坡相比较小，并指出它们的产状形成了坡度斜坡。(7)坡面移动区水分充沛，常被用作稻田或农场。较少