Preparation And Application Of Bio-based Loess Stabilizer For Soil And Water Loss Control

Soil erosion in China is a concentrated reflection of ecological deterioration,threatening national ecological security,drinking water safety,flood control security and food security,and constraining China's economic and social sustainable development.One of the areas with the most severe water and soil loss in the Loess Plateau is due to the special nature of the loess' s own structure,making it difficult to manage it.At present,the main methods of engineering measures,biological measures,and farming practices in the traditional method of controlling loess soil erosion are limited,and the new loess stability restoration technology has been gradually promoted due to its advantages,which are mainly through the use of various types of soil erosion stabilizers.Fundamentally change the physical and chemical properties of the soil so as to achieve the effect of governance.This article combines the environmental characteristics of the northwestern region,specifically for soil and water loss in the loess region to propose ideas for the management of loess soil erosion control stabilizer.Using soil physical and mechanical properties experiments and indoor pot experiment research methods,systematically studied the effects of stabilizer selection and preparation,the loess' s water stability,shear strength,compressive strength,erosion resistance,and plant adaptability,as well as the changing patterns and freezing.The effects of thawing cycles on the changes of body shape,water content,and compressive shear strength of stable loess were combined.Microscopic electron microscopy and Fourier transform infrared spectroscopy were used to elucidate the mechanism of stabilizing agent's restoration of loess soil erosion.The main conclusions of the thesis are as follows:1.Determine the raw material of the stabilizer and determine the optimal conditions for the stabilizer preparation by experimental screening: CMC 3.0 g,XG 1.0 g,STMP 0.1 g,pH 7,stirring time 1 h;The dry and wet densities are lower,the moisture content is lower,and the plasticity index is also lower.This proves the loose and porous nature of the loess and gives a preliminary understanding of the causes of water and soil loss in the area.2.The application of stabilizers increases the water stability,compressive shear strength,and erosion resistance of loess,but it does not work immediately after the stabilizer is applied,but requires a certain reaction time;the application of stabilizers makes the loess.The flushing rate has been reduced to a great extent and is decreasing with the increase of stabilizer concentration.Stabilizers have strong resistance to extremely cold conditions.Specifically,the quality loss rate of stable loess after submerged at 10?,30? and 12 freeze-thaw cycles is less than 1%,and the loss rate of strength is not more than 25%.The volume increase is not.Obviously,microcracks occur only after a certain number of cycles,but the overall structure of the loess is stable.3.The hydrophilic properties of the stabilizer itself improve soil water availability and promote the growth and development of vegetation.Compared with unstable loess,stable loess seed germination rate is higher and vegetation growth is excellent.At the same time,the stabilizer can increase the amount of agglomerates in the loess,stabilize the loess' s fertility,maintain the loess' s moisture,and ultimately achieve the purpose of maintaining water and soil.4.The results of scanning electron microscopy revealed the physicochemical interaction between stabilizers and soil particles.The stabilizer acts as a thin film or a filament acting on the soil particles,so that the fine particles are linked to each other through these macromolecular chains and become a whole.It is this cementation relationship that establishes the soil.The water chemistry and mechanical properties are improved and improved.