Mechanical characteristics of weathered rocks and soils for hazard assessment of slope areas.

风化岩石和土壤的力学特征用于斜坡区域的危险评估。

• 批准号: 11460067
• 负责人: MARUI Hideaki
• 金额: $ 4.93万
• 依托单位: NIIGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11460067/
• 关键词: chemical weathering; Tertiary type landslide; crystalline schist landslide; residual shear strength; ring shear test apparatus; elementary analysis; swelling minerals; landslide topography; 第三紀層泥岩; 地すべり; せん断抵抗角; 変質安山岩; 稗田山; 崩壊地

Followings are conclusive summary of our investigation.(1)Many tertiary type landslides are distributed in the Higashikubiki area, Niigata Prefecture. Frequency of landslide occurrences in this area is related to the bedrock geology. Several non-weathered and weathered mudstone samples were collected from landslide areas distributed in Teradomari, Shiiya and Nishiyama geologic formations. Simple and ring shear tests were carried out on these samples. Weathered mudstone samples exhibited higher shear strength than non-weathered mudstone samples. Such phenomenon might depend on the changes of shear resistance of the slip surface of landslides caused by alteration of minerals during chemical weathering.(2)Triaxial compression test and ring shear test were carried out on clay samples of sliding surfaces in Tertiary type landslides and crystalline schist landslides. Angles of internal friction of residual shear strengths of these samples range from 5 to 30 degree. Their angles of samples fr … More om Tertiary landslides are less approximately 10degree than those of samples from crystalline schist landslides. This fact is concordant with difference of slopes between the two type landslides. Mg content of clay samples is reduced through chemical weathering, ferric and aluminum components are residua relatively increase. Swelling minerals such as chlorite and smectite are closely connected to the lowering shear resistance of clay of sliding surface.(3)Landslide movements are controlled by bedrock geology and characteristics of soils, and produce unique topographic features. Landslides for once are similar in shape. Creeping landslides, in contrast, are morphologically characterized by aggregates of various partial slumps. Slopes of landslides distributed in Tertiary sediments show less than 30 degree. Slopes of them, in particular, show around 18 degree in mudstone area. Landslides distributed in volcanics show more than 30 degree of slope and their movements are similar to rock slide or rock avalanche.(4)Slopes of landslides distributed in crystalline schist and in Tertiary sediment range from 15 to 35 degree and from 10 to 20 degree, respectively. Sizes of landslides such as length, width and area in Tertiary sediments are larger than those in crystalline schist. The depth of sliding surfaces of landslides in Tertiary sediments, however, is shallower than those in crystalline schist.Groundwater tables in landslides in Tertiary sediments are generally shallow and close to surface. On the other hand, many landslides in crystalline schist have deeper groundwater tables than their sliding surfaces. Less

以下是我们调查的结论性总结。（1）新泻县东久备地区分布着许多第三系类型的滑坡。该区滑坡发生频率与基岩地质有关。从寺泊、椎谷和西山地质组分布的滑坡区采集了几个非风化和风化泥岩样品。对这些试样进行了单剪和环剪试验。风化泥岩样品的抗剪强度高于非风化泥岩样品。这种现象可能与化学风化过程中矿物蚀变引起滑坡滑面抗剪强度的变化有关。（2）对第三系滑坡和结晶片岩类滑坡滑动面粘土样进行了三轴压缩试验和环剪试验。这些样品的残余剪切强度的内摩擦角范围从5 °到30 °。他们的角度的样品， ...更多信息 第三系滑坡的温度比结晶片岩滑坡的温度低约100 °。这与两类滑坡的坡度差异是一致的。化学风化使粘土样品中Mg含量降低，铁、铝组分残留相对增加。膨润土、蒙皂石等膨胀矿物与滑动面粘土抗剪强度降低密切相关。（3）滑坡运动受基岩地质和土体性质的控制，并产生独特的地形地貌。这一次，山体滑坡的形状相似。蠕动滑坡则相反，其形态特征是由各种局部滑塌的集合体组成。分布于第三系沉积物中的滑坡坡度一般小于30 °。特别是在泥岩区，它们的坡度约为18度。分布于火山岩中的滑坡，坡度大于30 °，运动方式类似于岩滑或岩崩。（4）分布于结晶片岩和第三系沉积物中的滑坡坡度分别为15 ~ 35 °和10 ~ 20 °。第三系沉积物中滑坡的长度、宽度和面积均大于结晶片岩中的滑坡。第三系沉积物中滑坡滑动面的深度比结晶片岩中的滑动面浅，第三系沉积物中滑坡的地下水位一般较浅且接近地表。另一方面，结晶片岩中的许多滑坡具有比其滑动面更深的地下水位。少

项目成果

児玉貴幸・渡部直喜・丸井英明: "新潟県東頸城地域の新第三紀層地すべり泥岩の科学風化作用とせん断強度特性"新潟大災害研年報. 22号. 17-30 (2000)

Takayuki Kodama、Naoki Watanabe、Hideaki Marui：“新泻县东久引地区新近系层滑坡泥岩的科学风化和剪切强度特征”新泻灾害研究所年报22、17-30（2000）。

鈴木将之・佐藤修: "福島県滝坂地すべり地の地下水の水質とその変動"新潟大災害研年報. 22号. 62-78 (2000)

Masayuki Suzuki 和 Osamu Sato：“福岛县泷坂滑坡现场的地下水质量及其波动”新泻灾害研究所年度报告 22, 62-78 (2000)。

Yamagishi, H.and Ito, Y.: "Characteristics and geomorpholofy of landslides distributed in Tertiary sediments in Hokkaido."Proceedings of collaboration research(11G-17)of DPRI, Kyoto Univ.. 1-18 (2000)

Yamagishi, H.和 Ito, Y.：“北海道第三纪沉积物中分布的滑坡的特征和地貌”。DPRI 合作研究论文集(11G-17)，京都大学。1-18 (2000)

鈴木幸治,徐輝竜,佐藤修,渡部直喜: "新潟県柏崎平野の地下水の温度異常と伏在活断層"財団法人産業地質科学研究所 研究年報. 11号. 134-141 (2000)

铃木浩二、徐照、佐藤修、渡边直树：“新泻县柏崎平原地下水温度异常与隐藏的活动断层”工业地球科学研究所研究年报11，第134-141号（2000）。

丸井英明: "ハザード・ゾーニングと土地利用規制-オーストリアの事例-"新潟大学災害研年報. 21号(印刷中). (1999)

Hideaki Marui：“危险区划和土地利用法规 - 奥地利案例研究”新泻大学灾害研究所年度报告第 21 号（出版中）。