Dissertation > Excellent graduate degree dissertation topics show
Engineering Behaviors and Fine Content Effect of Unsaturated Sandy Soil
Author: TianHuNan
Tutor: KongLingWei
School: Wuhan Institute of Rock and Soil Mechanics
Course: Geotechnical Engineering
Keywords: fine content unsaturated sand permeability soil-water characteristic curve strength properties
CLC: TU441.4
Type: Master's thesis
Year: 2009
Downloads: 180
Quote: 6
Read: Download Dissertation
Abstract
|
In this thesis,sandy soil permeability,water retention capacity,and unsaturated strength properties is analyzed by the method of lab experimentation.Firstly,the basic physical properties index of 10 kinds of silty sand are measured to know the fine contents effect by introduction of new intergranular sate parameters. The results show that the particle size distribution of silty sand is from worse to better when the fine contents are increased.The maximum void ratio line move upwards as the fine content increased until the fine content up to 25%,and then the maximum void ratio decreased.So the limit fine content of silty sand is 25%.The interfine void ratio e_f decreased with the fine content increased.Secondly,by the method of lab experimentation permeability of silty sand is analyzed from the viewpoint of considering the effects of fine content.The results show that the pore characters of silty sand are changed with different fine content.The coefficient of permeability decreased as the fine content increased.The permeability coefficient decreases sharply,when fine content less than 10%.In the semi-logarithmic coordinates interfine void ratio and coefficient permeability have a good linear correlation.Thirdly,experimental research on water retention characteristics of silty sand with different fine content is carried out by pressure plate test.The results show that there is small impact of SWCC considering different fine content within quasi-saturation regime, while,the water retention capacity of unsaturated sand enhanced significantly.A mathematical model of SWCC is advanced,which is applied to predict unsaturated hydraulic conductivity of silty sand.The forecasted unsaturated hydraulic conductivity rapidly decline until the fine content increase up to 15%.After that,the curve dips gently.15%fine content is the critical fine content of silty sand on unsaturated hydraulic conductivity,which can also be Confirmed by the curve relationship between average particle diameter,intergranular void ratio,interfine void ratio and the unsaturated hydraulic conductivity. Finally,by the direct shear test of silty sand is analyzed from the viewpoint of considering the effects of fine content and suction.The results show that the internal friction angle of unsaturated silty sand with different fine content vary from 32°to 41°by the unification of the strength of the formula.The total cohesion changes Largely the matrix suction and fine content.The internal friction angle of unsarurated silty sand increase as the matrix suction increase.Fine content impact significantly on the strength of unsarurated silty sand and the critical fine content of silty sand is vary 15%to 20%.The internal friction angle decrease and the total cohesion increase with fine content increase under the same matrix suction.Apparent cohesion with the fine content increases linearly,the internal friction angle decreased as the intergranular void ratio increase.The turning point of the curve is near 1.5,corresponding FCcr is about 20%.Apparent cohesion with the intergranular void ratio increases linearly,while interfine void ratio and the internal friction angle showed non-linear changes,with the same FCcr 15%.
|
Related Dissertations
- Capsaicin / β - cyclodextrin system to dissolve and penetrate the,R943
- Study on Hydraulic Fracturing of Low Permeability Reservoir,P618.13
- Research on PSA/Cotton Blend Fabric of Coatinging of Water Resistance and Moisture Permeability,TS195.6
- Modified TiO2 Submicrospheres Doped Organic-inorganic Hybrid Membranes and Their Proton Conductive and Alcohol-rejecting Properties,TM911.4
- The Study on Strength Deformation and Structural Characteres of Red Clay in Hainan,TU44
- Experimental Study of Mechanical Properties of Fibre and Multifilament of Deep-sea Mooring Cables,O346
- Simulation of Transport of Nitrate-N and Leaching Loss Flux of Aeration Zone in Luanjing Irrigation Area,S153
- Research on Remaining Oil Development Using Horizontal Well Technology in Low Permeable Reservoir of BaoBei District, BaoLang Oilfield,TE327
- Study of the Upper Paleozoic Reservoir in Jingbian Gas Field,P618.13
- Effective Water Flooding Study of Block 19-34 in Tanan Oilfield,TE357.6
- Studies of Processing and Storage of the Meat of Cantonese Nutritional Diet,TS251.5
- Protective layer on the mining of coal and rock deformation and pressure relief gas drainage technology,TD712.6
- The Research on the Effect of Mining Stress on Gas Pressure in Stope in High Gassy Seam,TD712
- Research on the Permeability of Cuticle and Screening for Efficient Surfactant,Q942
- Influences of Authigenic Chlorites on Sandstone Reservoir Quality in Chang-8 Member of the Upper Triassic Yanchang Formation in Jiyuan-Huaqing Area, Ordos Basin,P618.13
- Research and Application of Steady State Instead of Transient State Method,P618.13
- Simulation of In-situ Stress Field of Low Permeability Reservoir of Fuyang Formation in Zhou 201 Block,P618.13
- Study on the Conductivity Model for Deep Conglomerate Reservoirs in Xujiaweizi Area,P618.13
- Study on Evaluation Methods of Wireline Formation Test Data in Offshore Low Porosity and Permeability Reservoirs,P618.13
- Research on the Classification of the Low Permeability Sandstone Reservoir,P618.13
- Study on Logging Evaluated Reservior of the Layer of Upper Paleozoic in the DX Area of Dniudi Gas Filed,P631.81
CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Various types of soil and foundation > Adhesion ( cohesive ) soil and foundation > Sand and ground stress
© 2012 www.DissertationTopic.Net Mobile
|