Soil Cutting and Tillage

ISBN: 9780444425485 出版年：1985 页码：226 Elsevier Science_RM

1. Introduction to Tillage and Earthmoving. History of tillage. Main types of tillage tools. Earthmoving equipment. The analysis of soil cutting and tillage. 2. Soil Mechanics. Coulomb's law of friction and cohesion. The method of stress characteristics. Boundary conditions. Measurement of soil strength properties. Soil behaviour considerations. Problems. 3. Soil Cutting Forces. The universal earthmoving equation. Two dimensional cases: method of stress characteristics. The method of trial wedges. Similitude methods. Three dimensional cases. Dynamic effects. Critical depth. Complex tool shapes. Problems. 4 Soil Loosening and Manipulation. Measurements of soil loosening. Efficiency of soil loosening. Soil mixing and inversion. Tool spacing. 5. Soil Properties and Plant Growth. Soil compaction. Mechanical and hydraulic properties of compacted soil. Soil physical properties and plant growth. Tillage of compacted soil. Problems. 6. Traction Machines. Force and energy balances. Traction, soil deformation and slip. Sinkage and rolling resistance. Machine internal losses. Matching machines and tools. Problems. References. Appendices. Indexes.