Hysteresis Effect of Water Retention and Permeability of Unsaturated Soils on Instability of Slope Due to Rainfall
Hysteresis Effect of Water Retention and Permeability of Unsaturated Soils on Instability of Slope Due to Rainfall
批准号:
10660227
负责人:
SHIMADA Kiyoshi
金额:
$1.79万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
1998
资助国家:
日本
项目状态:
已结题
起止时间:
1998 至 1999
中文摘要
在冈山的Masa土上进行了持水曲线滞后和非饱和渗透率滞后试验。利用考虑降雨入渗引起的非饱和土抗剪强度降低的边坡稳定性分析数值程序,研究了非饱和土性质对安全系数折减行为的影响。并对数值计算程序进行了改进,使其能同时考虑降雨入渗和地震对边坡稳定性的影响。计算结果表明:(1)体积含水率与相对渗透率关系的滞后性可以忽略不计。(2)土体持水曲线在饱和附近出现小幅度下降时,边坡的安全系数可以反映降雨入渗引起的突降。(3)试验应在吸收条件下进行,以便将试验结果应用于降雨入渗失稳问题。(4)地震作用下,受降雨入渗影响的边坡变得更加不稳定。
英文摘要
The test for hysteresis of water retention curve and that for unsaturated permeability were carried out on Masa soils produced in Okayama. The effect of the unsaturated properties of slope soils on the reduction behavior of the safety factor is examined with the numerical program of the slope stability analysis considering the reduction of the shear strength of unsaturated soils due to the rain infiltration. The numerical program is also improved for considering both the effect of the rain infiltration and that of an earthquake on the slope stability. The numerical results give the following conclusions.(1) The hysteresis of the relationship between the volumetric water contents and the relative permeability can be neglected.(2) The safety factor of a slope, whose soil has the water retention curve showing a small magnitude near saturation, can show the sudden drop due to rain infiltration.(3) The test obtaining the water retention curve should be carried out under absorbing condition, when the results are supposed to be applied to the instability problem due to rain infiltration.(4) The slope suffering from the rain infiltration becomes more unstable when the earthquake strikes the slope.
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Shimada, K, H. Fujii, S. Nishimura, T. Nishiyama and T. Mrii: "Slope instability due to rainfall and earthquake"Proc. of International Synposium on Slope Stability Engineering. 1. 653-656 (1999)
Shimada、K、H. Fujii、S. Nishimura、T. Nishiyama 和 T. Mrii:“降雨和地震导致的斜坡不稳定”Proc。
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通讯作者:
Shimada,K, H.Fujii, S.Nishimura, T.Nishiyama and T.Morii: "Hysteresis effect of decomposed granite soil on slope instability due to rainfall"Proc. of 8th Congress of International Association of Engineering Geology. 3. 1981-1986 (1998)
Shimada,K,H.Fujii,S.Nishimura,T.Nishiyama 和 T.Morii:“风化花岗岩土对降雨引起的边坡失稳的滞后效应”Proc。
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Shimada,K, H.Fujii, S.Nishimura, T.Nishiyama and T.Morii: "Slope instability due to rainfall earthquake"Proc. of International Symposium on Slope Stability Engineering. 1. 653-656 (1999)
Shimada,K,H.Fujii,S.Nishimura,T.Nishiyama 和 T.Morii:“降雨地震导致的斜坡不稳定”Proc。
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Shimada, K, H. Fujii, S. Nishimura, T. Nishiyama and T. Morii: "Hysteresis effect of decomposed granite soil on slope instability due to rainfall"Proc. of 8th Congress of International Association of Engineering Geology. 3. 1981-1986 (1998)
Shimada、K、H. Fujii、S. Nishimura、T. Nishiyama 和 T. Morii:“风化花岗岩土对降雨引起的边坡失稳的滞后效应”Proc。
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共 7 条
Studies on development of avian embryo after ICSI
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批准号:19580325
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Study on functions of Dmrt-1 gene on Z sex chromosome in birds
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依托单位:
Molecular mechanisms of sex determination in birds
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批准号:10044201
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Evolution of functions of sperm W chromosome
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依托单位:
Studies of molecular mechanisms on the sexual determination and differentiation
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批准号:10660268
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Molecular studies on incubation behavior and the application
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Regulation mechanisms of transcription of sex steroidogenic enzymes during follicular growth in the chicken.
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依托单位:
Molecular mechanisms of oviposition control
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Effect of suction on shear strength of soils
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财政年份:1991
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依托单位:
Coordinating mechanisms of prostaglandins and vasotocin in the control of ovulation-oviposition
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批准号:61560301
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依托单位:
海外基金