Experimental Study On Vibrating Subsoiling Components In Soda Saline Alkali Soil

Aiming at the problems of heavy soil viscosity,poor air permeability and permeability and large subsoiling resistance in saline alkali land,in order to reduce the subsoiling resistance,this paper takes the vibration motor as the vibration source of subsoiling parts,and forms a forced vibration subsoiling device in the form of direct connection between the vibration motor and the subsoiling shovel.Through the comparison of accumulation test,soil sliding test and discrete element simulation test,the soil intrinsic parameters required by discrete element simulation and the contact parameters between soil and 65 Mn steel are calibrated,and the discrete element simulation analysis of the subsoiling process of subsoiling shovel is completed;The vibration subsoiling parts were processed and manufactured to complete the field experiment.The drag reduction performance of vibration subsoiling and the influence of subsoiling on the soil structural properties of saline alkali soil were analyzed.The test results show that forced vibration plays an important role in reducing resistance and consumption of subsoiling parts,reducing salt in saline alkali soil and improving soil physical properties in saline alkali soil.The main research contents and conclusions of this paper are as follows:(1)Test and analysis of physicochemical properties of saline alkali soil.Through the measurement and analysis of particle size,moisture content,bulk density,firmness and salt of saline alkali soil,it is concluded that saline alkali soil has the characteristics of large viscosity and compact accumulation.(2)Design and manufacture of vibration subsoiling device.According to the soil structure characteristics of saline alkali land and the research results of subsoiling machine vibration device at home and abroad,the vibration motor is determined as the vibration source,the forced vibration device which directly connects the vibration motor with the end of subsoiling shovel handle and the subsoiling part is hinged with subsoiling frame is designed,and the processing and manufacture of the device is completed.(3)Calibration of simulation and test parameters of saline loose soil.Through the direct shear and triaxial tests of saline alkali soil,the soil parameters of saline alkali soil were determined;The intrinsic parameters of saline alkali soil are calibrated by comparing the stacking test with the discrete element simulation test of stacking angle;Through the static friction test of saline alkali soil and the comparison between sliding test and sliding angle discrete element simulation test,the contact parameters between saline alkali soil and 65 Mn steel are measured and calibrated.The simulation analysis of the subsoiling process of subsoiling shovel is completed by using edem,which plays a guiding role for the follow-up field experiment.(4)Field experiment of vibrating subsoiling device in saline alkali soil.Taking the exciting force,ploughing depth and operation speed of the vibrating motor as the test factors and the subsoiling resistance as the test index,the field test is carried out.Compared with the non vibration condition test of the same plot and the same subsoiling part,it is concluded that the vibrating subsoiling can significantly reduce the subsoiling resistance,and the drag reduction performance changes linearly with the change of the exciting force of the vibrating motor.The drag reduction performance of different vibrating motors is related to the subsoiling depth and operation speed.700 kg exciting force vibration motor has the best drag reduction effect,with an average drag reduction of 33.69%.(5)Determination of physicochemical properties of soil after subsoiling.The average firmness decreased by 5.26kg/cm2 after vibration subsoiling and 1.63kg/cm2 without vibration subsoiling;After vibration subsoiling,the average bulk density decreased by 0.32g/cm3,and without vibration subsoiling decreased by 0.13g/cm3.After three months of subsoiling test,the average soil moisture content in vibration subsoiling area increased by 4.21% and that in non vibration subsoiling area increased by 1.08%;The average salt content in vibration subsoiling area decreased by 7.75%and that in non vibration subsoiling area decreased by 2.15%.According to the physical and chemical characteristics of saline alkali soil,the forced vibration subsoiling device is designed and manufactured,and the relevant theoretical analysis and experimental research are carried out.The research conclusion has important theoretical and practical significance for subsoiling and drag reduction of saline alkali soil and the improvement of soil physical and chemical properties,and further enriches the theory and technology of ecological improvement and engineering equipment research and development of saline alkali soil.