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Study on evaluation of stability of slope holding discontinuous plane causing slope failure

导致边坡失稳的边坡稳定性评价研究

基本信息

批准号：
15560427
负责人：
YAMAMOTO Tetsuro
金额：
$ 1.34万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560427/
关键词：
discontinuous plane slope failure safety factor rainfall in-situ shear test field survey tree root direct box shear test 斜面崩壊安定性模型実験表層崩壊一面せん断断層

项目摘要

According to our field survey, slope failure frequently occurred along a discontinuous plane during tiny rainfall. The discontinuous planes resulting in slope failures were classified as following : 1) fractured clay in landslide area, 2) schist developed in slate, 3) thin glossy black soil adhered to joint or schist in metamorphic rock, 4) boundary plane between weakly and strongly weathered granite rocks, and 5) clay-seam interpenetrated in granite rock. During two years from 2003 to 2004, we investigated 37 sites of slope disasters occurred in Yamaguchi prefecture and then measured shear strength mobilized on the discontinuous plane in the site or the laboratory using an ultra simplified in-situ shear test apparatus. Also the direct box shear tests were performed on two types of Masado that were sampled in Ube and Iwakuni, to demonstrate the validity of the in-situ test. These test results suggested that the strength parameter obtained by the in-situ test should be used in the stability analysis of cut slopes having the discontinuous planes. Secondly, weathered slopes of the Kanmon group were surveyed on six risk factors such as height of slope, rainfall, folding etc. A fault was regarded as one of the discontinuous planes. Slopes that have the fault on the top and two more factors are prone to collapsing. The results should be effective to determine the inclinations of cut slopes. Thirdly, the tree root was taken up as an important factor related to surface failure. The direct box shear test was performed on Ube Masado mixed with tree roots. The test results showed that an increase of the apparent cohesion remarkably exhibited rather than that of the internal friction angle under condition of low overburden pressure. Finally, if the discontinuous planes are seen inside a slope, it means that possibility causing slope failure is high.

根据现场调查，在降雨较少的情况下，边坡破坏多发生在不连续面上。导致边坡失稳的不连续面可分为：1)滑坡区破碎粘土，2)板岩中发育的片岩，3)变质岩中粘结节理或片岩的薄光滑黑土，4)弱风化与强风化花岗岩之间的分界面，5)花岗岩中互穿的粘土层。在2003~2004年的两年间，我们对山口县发生的37个边坡灾害现场进行了调查，并在现场或实验室用超简化的原位抗剪试验仪测定了不连续面上的抗剪强度。为了验证现场试验的有效性，还对在Ube和Iwakuni抽样的两种Masado进行了直接箱剪试验。这些试验结果表明，现场试验得到的强度参数可用于含不连续面路堑边坡的稳定性分析。其次，对坎门组风化边坡进行了边坡高度、降雨、褶皱等6个危险因素的调查，将断层作为不连续面之一。顶部有断层和另外两个因素的斜坡很容易坍塌。计算结果对确定路堑边坡的倾角具有一定的参考价值。第三，认为树根是地表破坏的重要因素。进行了宇部Masado与树根混合后的直箱剪切试验。试验结果表明，在低覆岩压力条件下，表观粘聚力的增加明显，而不是内摩擦角的增加。最后，如果在斜坡内部看到不连续的平面，这意味着导致斜坡破坏的可能性很高。

项目成果

期刊论文数量（20）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

表層土の一面せん断試験における根茎の影響

根茎对表土单面剪切试验的影响

DOI：
发表时间：
2004
期刊：
自然災害研究協議会西部地区部会報・研究論文集 28号
影响因子：
0
作者：
川内崇文;江藤崇;廣岡明彦;西岡佑介;鈴木素之
通讯作者：
鈴木素之

Slope disasters caused by heavy rainfalls in Yamaguchi prefecture, 2004

2004年山口县强降雨引发的斜坡灾害

DOI：
发表时间：
2005
期刊：
Western Regional Division Report of Natural Disaster Research Council No.29
影响因子：
0
作者：
Tetsuro Yamamoto;Motoyuki Suzuki;Naoki Takeda;Tomohiro Tomokiyo;Emi Kamimura;Yoichi Sehara;Takashi Terayama
通讯作者：
Takashi Terayama

Effect of roots on strength of surface soil in direct shear test

直剪试验中根系对表土强度的影响