تاثير برگ ها و سرني هاي خرد شده نيشكر، بيوچار و خاكستر آن بر خواص مهندسي و مقاومت برشي دو خاك با بافت متفاوت

چكيده انگليسي :

89 Impact of Shredded Leaves and Tops of Cane Stalk and Their Biochar and Ash on Engineering Properties and Shear Strength of Two Texturally Different Soils Samer Alomar Sameralomar1988a@gmail com December 24 2016 Department of Biosystems Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Abbas Hemmat ahemmat@cc iut ac irAbstractOne of agriculture methods for reaching to stable sugarcane farms keep soil structure against influential stresses These stresses can be induced by the movement of agriculture machines harvesting and transport sugar canemachines or by wet and dry processes Soil compression considered as the most important factor that destroysphysical fertility of soil Add plant residue to the soil can improve soil structure and water retention in the soil Nowadays by increasing of farms areas improving of heavy agriculture machines and increasing of work capacityof them for decreasing of production coast per hectare soil compaction risk has been increased Soil type andclimatic characteristics of sugarcane region in Khuzestan province in comparison with other global regions aredifferent By taking into account the large areas of sugarcane farms weak soil structure and high compaction ofthem add planet residue and increasing of organic material of sugarcane farms is very important Therefore thegoal of this research is Impact of additives shredded leaves and tops of cane stalk their biochar and ash withdifferent amounts of weight percent 1 and 2 of two texturally different soils clay and sandy loam of surfacelayer 0 to 20 centimeter of Lavark and Tiran farms and with two moisture levels 0 8PL and 1 1PL PL PlasticLimit on engineering properties SL Shrinking limit PL Plastic limit LL Liquid limit PI Plastic Index andFI Friability Index and shear strength parameters Changing of soil moisture content causes internal stresses inthe soil Internal stress changes physical structure of the soil This change in moisture content was determined bysoil engineering properties Atterberg limits So that engineering properties were determined as following shrinking limit by special mold plastic limit by rolling and penetration cone method liquid limit by Casagrandecup method Soil failure considered as shear failure and the maximum shear stress at failure time called shearstrength The amount of organic material in soil affects on shear strength parameters Shear strength parameters Cohesion C and internal friction angle were determined depending on direct shear test Interactions of meanfactors on engineering properties and shear strength parameters were assessed depending on Factorial experimentin a completely randomized design for three replications The comparison between treated soil with additives andcontrol was evaluated depending on completely randomized design The Results of clay loam soil treated withadditives indicated that friability index for 2 biochar has been significantly increased to 61 2 compared tocontrol For sandy loam soil treated with additives friability index for 1 or 2 biochar has been significantlyincreased to 25 compared to control By increasing of clay percent from 13 3 sandy loam to 30 clay loam adding 2 of shredded planet residue and increasing of moisture content from 0 8PL to 1 1PL cohesionparameter of soil has been significantly increased to 32 8 45 5 15 and 85 By decreasing of clay percent from30 clay loam to 13 3 sandy loam adding 2 of additives and decreasing of moisture content from 1 1PLto 0 8PL internal friction angle parameter of soil has been significantly increased to 30 5 8 4 and 23 6 Internalfriction angle was not affected by additives The comparison between treated clay loam with additives and controlfor moisture content 0 8PL indicated that by adding 1 or 2 of additives to soil shear strength parameters Cand have been decreased The comparison between treated clay loam with additives and control for moisturecontent 1 1PL indicated that by adding

العمر، سامر

تاثير برگ ها و سرني هاي خرد شده نيشكر، بيوچار و خاكستر آن بر خواص مهندسي و مقاومت برشي دو خاك با بافت متفاوت

حد خميري , شاخص خميري , شاخص تردي , مقاومت برشي , چسبندگي , اصطكاك داخلي