Effects of drought preceding rainfall on slaking-induced slope instability

降雨前干旱对崩解引起的边坡失稳的影响

• 批准号: 24656282
• 负责人: KIYOTA Takashi
• 金额: $ 2.25万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656282/
• 关键词: スレーキング; 斜面崩壊; 一面せん断試験; 地盤災害; 泥岩; 室内土質試験; 干ばつ; 豪雨; 風化; 堆積岩

This study investigates the effects of wetting and drying on the strength and deformation characteristics of mudstone, known as slaking. When rainfall-induced landslides occur, the intensity-duration of precipitation is often examined, but the drought conditions preceding the landslide-inducing rainfalls are not usually considered. The author proposed a hypothesis that such drought and rainfall cycles would accelerate slaking on the geo-materials. First, we undertook to collect landslide data from various sources in order to identify slaking-induced landslides. Second, a series of direct shear tests was conducted by simulating cyclic drying and wetting (D/W) under different stress condition. Considerable creep deformations on crushed mudstones were found during both D/W phase, and a gradual decrease of friction angle was observed with the increasing number of D/W. Higher slaking index, lower water content before wetting and lower initial density accelerate the slaking of geo-materials.

本研究探讨了湿润和干燥对泥岩强度和变形特性的影响。当降雨引起的滑坡发生时，通常会检查降水的强度-持续时间，但通常不会考虑诱发滑坡的降雨之前的干旱条件。作者提出了这样的旱涝循环会加速地质物质的溶蚀的假设。首先，我们从各种来源收集滑坡数据，以确定滑坡成因。其次，模拟不同应力条件下的干湿循环（D/W），进行了一系列直剪试验。泥岩破碎体在D/W阶段均存在较大的蠕变变形，且摩擦角随D/W的增加而逐渐减小。较高的软化指数、较低的润湿前含水率和较低的初始密度会加速土工材料的软化。

项目成果

Effect of slaking on the engineering behaviour of the crushed mudstones, Bulletin of Earthquake Resistant Structure Research Center

熟化对破碎泥岩工程性能的影响，抗震结构研究中心通报

• 发表时间: 2013
• 期刊: Institute of Industrial Science, University of Tokyo
• 作者: Sharma;K.;Kiyota;T. and Kyokawa;H
• 通讯作者: H

Cyclic wetting and drying induced creep deformation of crushed mudstone in direct shear test

碎泥岩直剪试验中干湿循环引起的蠕变变形

• 发表时间: 2012
• 期刊: Proc. of the 14th International Summer Symposium, JSCE
• 作者: Sharma;K.;Kiyota;T. and Kyokawa;H.
• 通讯作者: H.

気候変動と斜面災害

气候变化与斜坡灾害

EFFECT OF SLAKING ON THE ENGINEERING BEHAVIOUR OF THE CRUSHED MUDSTONES

• 发表时间: 2013
• 作者: K. Sharma;T. Kiyota;H. Kyokawa

Effects of drought preceding rainfall on slaking-induced instability

降雨前的干旱对熟化引起的不稳定的影响

• 发表时间: 2012
• 期刊: Geotechnical Hazards from Large Earthquakes and Heavy Rainfall
• 作者: Lee;J.;Sharma;K.;Kiyota;T.;Kyokawa;H. and Takeuchi;W
• 通讯作者: W