In the paper, a shear spring model is proposed to simulate the constraint of the soil. Based on this model, the theoretic formula of pile head stiffness is derived.
本文提出的用模拟桩周土约束的剪切弹簧模型来计算单桩刚度，并推导出了相应的理论计算公式。
The simple corn planter of the utility model makes use of the straight pipe, the spring opener and the spring pull rod to skillfully deliver and automatically bury the corn seeds into the soil.
本实用新型的简易玉米播种机利用直管、弹簧开口器及弹簧拉杆将玉米种子巧妙的送入土中并自动掩埋。
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