Solidification Research And Microscopic Quantitative Study Of Ningbo Muckey Soil

We need to improve the marine sedimentary soft soil in Ningbo area which has engineering characteristics of high natural water content, high porosity, low permeability, shear strength, high sensitivity and high content of organic matter. Taking into account the use of waste and the transportation and economy of materials, the slag and fly ash with good chemical activity were adding to the curing agent. It is necessary to study the influence of water content and organic matter content on the strength development of solidification. Reach on the microstructure of solidified soil can be beneficial to link the microscopic properties and the macroscopic mechanical properties.Based on the above, the dissertation mainly carried out the following work:1.Taking Ningbo mucky soil as solidifying objects, based on the analysis of its engineering properties, cement, slag, fly ash and triethanolamine as four influencing factors, unconfined compressive strength of solidified soil as a response value. The regression model between the influencing factors and the response values was obtained through response surface method. The regression model between each influence factor and the response value was obtained, and the effect of each influence factor on the response value was analyzed, and the formula of the compound additive NB15 was finally determined.2. Research on the effect of soil organic matter content and water content on solidified soil.We take the content of initial organic matter and water, the content of NB15 as three influencing factors, he regression model between the influencing factors and the response values will be obtained. Then, the interaction between the three influencing factors on the unconfined compressive strength of solidified soil would be analyzed in depth.3. Solidified soil with 10% content of NB15 as object of study. SEM images were scanned for 20 groups of solidified soil at different ages, and micro analysis was performed by IPP software. The calculation model of the three-dimensional porosity of soil is established. After analyzing the influence factors, make a reasonable choice, and verify the rationality of the calculation model.4.Indoor geotechnical tests were carried out to obtain the macroscopic physical indexes of the prepared samples; Micro parameters were obtained by means of three-dimensional porosity calculation model and microscopic analysis calculation. When macroscopic physical indexes is equal to the micro parameter, the corresponding calculation section is the section of soil mass, the corresponding soil particle size is the contact area of the soil mass. By this method we can calculate the average contact area of the soil. Through the analysis of influencing factors, taking reasonable choice to reduce the error.5. The aim of study of micro-quantitative research is to connect with the macroscopic mechanical properties. Average contact area is obtained by calculating model. ORIGIN software was used to study the relationship between the average contact area rate and the macro porosity.