The test mostly analyse the film mulching hill-drop planter from two aspects: One is mechanism of duck-mouth type punching-opener, One is analyse of metering device .
本文主要从两个方面对覆膜穴播机具进行分析：一是鸭嘴式成穴器的成穴机理；二是外槽轮式排种器的分析。
Three sets of model test in laboratory show that the failure model in the foundation with soft clay underlying layer belongs basically to the punching shear failure.
三组室内模型试验表明具有软弱下卧层的地基破坏模型基本上属于冲切破坏。
The proposed method of calculating punching capacity of such elements is put forward and the calculation results agree well with the test results available at home and abroad.
文中提出了这类构件受冲切承载力计算方法，按此方法计算所得值与国内外试验结果的符合程度较好。
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