糯米浆改良戚城遗址仿遗址土强度特性与作用机理

戚城遗址本体土质为粉质黏土,存在结构松散、强度低、毛细作用强烈及水稳定性差等不利特性,如何改善修复遗址土的性能令人关注.选用糯米浆、石英砂、氧化铝、氟化钙作为外加材料,对戚城遗址粉质黏土进行改良,制备仿遗址土.研究0％、1％、3％、5％、7％、9％糯米浆浓度下仿遗址土的力学性能、显微结构及色差变化.结果 表明:随着糯米...

Strength characteristics and mechanism of modified imitation ruins soil of Qicheng site with glutinous rice slurry

The ruins soil of Qicheng is silty clay, typically linked with unfavorable characteristics such as loose structure, low strength, strong capillary action and poor hydraulic property. How to improve the performance of the soil in the restoration site is of great concern. In this study, glutinous rice slurry, quartz sand, alumina and calcium fluoride were added to the silty clay in Qicheng site for improvement. The imitation ruins soil was prepared by this method. The mechanical properties, microstructure and color difference of the imitation ruins soil modified with different glutinous rice slurry contents (of 0%, 1%, 3%, 5%, 7%, and 9% concentrations) were studied. The results show that with the increase of the glutinous rice slurry concentration, the strength and internal friction angle of soil samples increase first and then decrease, and the cohesion shows a linear increasing trend; Imitation ruins soil improved by 3% concentration of glutinous rice slurry had the largest shear strength, unconfined compressive strength and internal friction angle, and its microstructure is dense; The color difference analysis of the soil sample shows that the color difference between the imitation ruins soil, imitation ruins soil improved by 3% concentration of glutinous rice slurry and the ruins soil are all small; Furthermore, using glutinous rice slurry to improve the MICP technique, it is found that glutinous rice slurry can increase the activity of bacteria and promote the production of calcium carbonate. With increasing of maintenance days, the strength of modified MICP soil has an increasing tendency, and the biological mineralization time is longer.