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Analysis on the Slope Stability of Expansive Soils

Author: XuFengJun
Tutor: WangBaoTian
School: Hohai University
Course: Geotechnical Engineering
Keywords: Expansive soil slope Expansion force Limit equilibrium method Expansion force test Direct shear tests Degree of compaction Optimum moisture content GEO-SLOPE software Universal slice method
CLC: TU443
Type: Master's thesis
Year: 2006
Downloads: 458
Quote: 2
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Abstract


Expansive soil slope is relatively mature, but consider the expansion force of the impact on safety factor of slope less literature. In this paper, the under construction Ninghuai high speed for the background, limit equilibrium theory to study the stability of expansive soil slope, the generic slice method, such as limit equilibrium theory, in the case of considering the expansion force derivation of expansive soil slope safety the coefficient Fs expression, expansive soil slope stability limit equilibrium calculation, combined with GEO-SLOPE software for the different slope ratio as well as a variety of other factors under the influence of the expansive soil slope safety factor calculation and analysis, resulting in swelling force safety factor in slope stability. Natural expansive soil slope, artificial excavation or filling expansive soil slope, in the role of climate and environment, soil moisture through surface evaporation, resulting in expansive soils shallow produce shrinkage fissures. The presence of fissures undermine the integrity of the soil, and provide convenient conditions for the infiltration of rain water. Continuous rain caused massive infiltration of rain water, resulting in a different expansion of the size of the additional force, soften after immersion in water of the surface soil, strength reduction, plus the dead weight of the soil, so that fractured the weak side of the soil body destruction, the foot of the slope at the driven upper soil traction destruction of the top of the hill at the imbricate landslide triggered from top to bottom, eventually leading to soil slope instability. Expansion force and direct shear tests through conventional indoor soil test to study the quantitative relationship of the expansive soil compaction maximum expansion force and moisture, expansive force value limit equilibrium; summed expansive soil compaction strength to strength with the moisture content increases the attenuation law, provide for different types of expansive soil slope stability calculation indicators. Existing limit equilibrium method is calculated on the basis of the derivation of the expansive soil slope safety factor after the introduction of the expansion force formula, mainly uses the GLE generic slice method, changing the boundary conditions, the safety factor of the iterative formula, while taking advantage of the GEO- SLOPE software, combined with laboratory test results for different slope ratio, intensity attenuation as well as a variety of other factors under expansive soil slope safety factor calculation analysis, resulting in the expansion force of the safety factor of slope stability calculations. Finally, by the calculation results of the expansive soil slope, specific analysis of landslide Middle-earth bar force, and provide reference for the calculation of expansive soil slope protection.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Various types of soil and foundation > Expansive soil and foundation
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