1. According to the earth pressure theory, the earth resistance to plow shares is supposed as passive earth pressure. 2. The edge curve of share is calc ulated by next equation (Fig . 1), y^n=… where B is breadth of share, the H is length of share , and n is about 1.9. 3. The slide angle δ is decided by Coulomb's drawing method, which is concerned friction angle θ' (between share and earth), internal friction angle of earth θ, and share angle β. 4. The external forces regarding to earth resistance are the weight of earth W, reaction of earth pressure P and R, and cohesion S and K. 5. By the two dimensional calculation for the horizontal and vertical equilibrium of forces on a minor stripe (Ydx) of share, the unknown force P is decided. 6. Then Pdx and Sdx are integulated for share plain, as following , ΣP=… where, M=… N=… ∑S=… The earth resistance on the share is, ∑Q=∑P+∑S 7. For example, horizontal tractive resistance to T-type Japanese plow share at clay soil, will be about 12.4 kg.
Mendeley出力
