水田土壤承压特性与测量装置研究

Research on the Pressure Characteristics of Paddy Soil and Measuring Device

针对农机具在水田土壤中工作时的沉陷问题,为保证机具的工作效率,对试验田的土壤参数进行测量,结合所测的土壤特性设计了一种测量水田土壤承压能力的装置。利用离散元仿真方法,通过建立水田土壤承压测量杆与水田土壤的接触模型,研究了不同形状、尺寸以及不同下陷速度的水田土壤承压测量杆对水田土壤承载能力的影响。结果表明:仅改变测量杆形状时,水田土壤对圆形接触面的承压力最大,值为164N;在同为圆形接触面形状下,直径30mm的接触面积能够承受土壤压力最大,值为305N;当仅改变下陷速度时,水田土壤的承压能力随下陷的速度增大而增大。田间试验表明:发现仿真与试验测量结果最大误差为13.5%,验证了测量结果的准确性。

Aiming at the subsidence of agricultural machinery working in paddy field soil,the soil parameters of the experimental field were measured,and a device for measuring the pressure-bearing capacity of paddy field soil was designed.According to the mechanical properties of the paddy field soil,by establishing the contact model between the paddy field soil pressure measuring rod and the paddy soil,the influence of paddy field soil pressure measuring rods of different shapes,sizes and different subsidence speeds on the paddy soil bearing capacity are studied.The results of the study show that when only the shape of the measuring rod is changed,the paddy field soil has the largest bearing pressure on the circular contact surface with a value of 164N;under the same circular contact surface shape,the contact area with a diameter of 30mm can withstand the maximum soil pressure with a value of 164N.305N;When only the subsidence speed is changed,the pressure-bearing capacity of the paddy soil increases with the subsidence speed.Finally,the simulation results are compared with the test results,and the maximum error is 13.5%,which verifies the accuracy of the measurement results.