加筋红土的工程性能与本构模型研究

Considering Yunnan typical laterite and adopting materials such as different glass-fibre, geo-textile, steel-plastic belt and new soil-solidified agent, this program has thoroughly studied the interface affection feature between the material and laterite, stress-strain feature of the reinforced laterite, mechanical feature of the laterite reinforced by the new soil-solidified agent, cause of formation of laterite and it's engineering geological feature separately. Among the studies, the large tri-axis trial and the study of einforcing laterite with new soil solidified agent are the first trial.The study result indicates that the function of reinforcing material can be explained with the concept of generalized equivalent confining pressure. On the basis of the concepts of Donald's equivalent confining pressure and the traditional reinforced earth ntension, considering the impact of the earth types and the different drainage conditions, the formula of the generalized equivalent confining pressure and the limit equilibrium of the common reinforced earth can be established. Based on the function of reinforcing material's broad equivalent confining pressure, the improved Duncan-Chang's hyperbolic constitutive model of reinforced laterite has been carried out. Also, an intension model and the failure criterion for the reinforced laterite in different drainage condition have been established. The study has been contrasting and comparing the laterite's reinforcing effect in different drainage and in different size of the sample, explicitly confirming the reinforced mechanism and feature in different drainage, clarifying the interface affection feature and process mechanism between the reinforcing material and laterite, exploring the new soil-solidified agent's reinforcing effect and mechanism for the first time, further researching laterite's engineering geological feature, raising the new cause of formation, forming mode and evolvement trend of laterite covered in carbonate rock, essentially explaining the inherent consolidate of the laterite's macroscopical and microcosmic characteristic.The product of this program remedies the vacancy, without reinforced laterite in this field, of the earth reinforcing technology, renovates the laterite's cause of formation, establishes the strong base for the laterite's further research, provides the reliable scientific gist and theory guideline for the effectively utilize of the laterite for the practical work.

首次提出利用加筋技术以有效改善红土的工程性能。进行加筋红土的三轴试验、离心机试验有限元分析并与工程实测资料对比；查明加筋红土的加筋机理和特点，优选筋材类型和加筋参数，建立其本构模型及有限元方法，为其应有提供科学依据和理论工具。这对于云南地区广泛分布的红土，作为工程材料的有效利用和基础设施工程的灾害防范具有重要价值。