Study On Engineering Management Technology Of Secondary Saline Alkali Land In Qaidam Basin

In the Qaidam Basin, the distribution of a wide range of secondary salinization of land, the research found that this is due to the basin, the irrigation system is not perfect, irrigation without row, groundwater uplift caused by a serious impact on the normal growth of crops. Therefore, through the development of new underground pipe drainage technology to effectively reduce the water level, improve the soil to provide a good environment for the growth of crops, improve the land use efficiency.This research is based on the study of the adaptability of the new dark tube drainage technology in the Qaidam Basin. In order to enhance the strength and corrosion resistance of the concrete water collecting pipe, the strength, density and corrosion resistance of the concrete are studied.The test results show that the drainage of underground pipes with different depth and spacing can effectively reduce the salt content of the soil. According to the set irrigation system, the amount of salt in the soil after "irrigation and drainage" reached 0.5%, which was in accordance with the normal growth of the Chinese wolfberry. Moreover, adding a certain amount of nano materials in the mortar can increase its strength and density, thus reducing the amount of water infiltration in the process of water delivery and preventing the occurrence of secondary salinization of soil.Finally by of different underground pipe buried depth and the layout of the space analysis, and combined with the unsteady flow calculation formulas and salt drainage and economic benefit indexes, and puts forward the test area underground pipe drainage arrangement of two-dimensional nonlinear programming mathematical model, using the gradient projection method combined with software to solve the model calculation, determine the test area of the optimal layout of underground pipe.