【作者】 魏安辉；

【导师】 文江泉；

【作者基本信息】 西南交通大学 ， 地质工程， 2006， 硕士

【摘要】 随着经济不断发展,近年来高等级道路建设越来越多地向红色砂泥岩(以下简称红层)分布地区深入,给勘察、设计和施工提出了越来越多新的课题,首当其冲的是红层的工程地质特性及其填筑路堤的性能。由于红层具有遇水易崩解软化,失水干缩,且本身强度低等不良工程地质性质,其变形破坏的力学机制复杂,目前对其路用性的评价还处于定性阶段,系统的定量研究还进行得很少。 红层填筑路堤的主要问题主要有两个:即沉降变形和耐久性能。 本文以川中侏罗系的遂宁组、沙溪庙组泥岩、泥质砂岩为研究对象,对川中红层泥岩采用常规化学方法、电子显微镜法及X射线衍射法进行了详细的化学成分、矿物成分分析,并对其渗透、压缩、崩解等工程地质特性进行实验,对其影响因素及产生影响的机理进行了详细分析。 本文对红层填料的级配、含水量、密实度对其强度的影响进行了实验研究,详细分析了三种指标对红层强度产生的影响和机理,并利用实验参数,采用数值方法对路堤边坡稳定性进行了分析计算,对路堤填筑过程中和填筑完成后的最终沉降及侧向变形进行了数值模拟,并与现场实际观测数据进行了对比分析,最后,分析了红层填筑路堤的抗水性能和抗风化性能。从沉降变形和耐久性能两方面论证了红层填筑路堤的可行性和可靠性。更多还原

【Abstract】 Along with the development of social economy, more and more high-criterion ways build to red madstone and sandstone ("redbeds" for short thereinafter) distribution in recent years, there appear many problems in the course of investigating, designing and constructing. The geological and engineering character and build embankment behavior stand in the breach. Because of the special character as collapse and be soften when encounter water, shrink and appear interstice when lose water, and the intensity itself is low, etc. its deformation mechanism is complex. At present, the estimate of the build behavior character is qualitative, and there is little about systemic quantificational study of it.There are two main problems of redbeds embankment, they are deformation and long-term behavior.In this paper, the author studyed the redbeds of Suining group and Shaximiao group of Jurassic at SUINING and HECHUAN in the center of SICHUAN basin.In the course of researching, the author get the chemical elements and the mineral components of redbeds by experiments, and acquired the penetrability, compressibility and collapse behavior, anasysed the influential factors and the influence mechanism detailedly.This thesis researched the variety of intensity of the redbeds material vs its grain grade, water content, compaction degree, anasysed the influential form and the mechanism of the three indexes. Then the author used the experimental parameters by numerical methods, anasysed the stability of embankment slopes and calculate the displacements, anasysed combined with the observation. At last, the author anasysed the capability of exluding water and resisting weathering, expatiated the feasibility and the reliability of redbeds embankment.更多还原