摘要
为研究开挖效应对花岗岩残积土工程特性的影响,进行压缩性和抗剪强度试验,研究应力卸荷、饱和软化、失水干缩的影响以及注浆加固效果,然后从几何微结构及其损伤角度,研究其开挖边坡滑动的微观机理,主要结果有:边坡开挖后,随着临空面的形成和暴露,失水干缩、应力卸荷及饱和软化等开挖效应将导致土体弱化,而且当它们共同作用时,弱化效应叠加;对花岗岩残积土注水泥浆,可修复并增强土体的微结构,减弱开挖效应;提出的微结构几何模型,基本反映了花岗岩残积土的微观特征,可较好地解释开挖效应,揭示开挖边坡的滑动破坏机理。研究成果可为花岗岩残积土开挖边坡防护的设计、施工及新技术研究提供概念上指导和参考。
In order to study excavation effects to engineering characteristics of the granite residual soil （GRS）, some tests on compressibility and shear saturation softening strength were carried out to study the effects of dried shrink age, stress unloading, and reinforcement of cement grout due to excavation, then the landslide mechanism of its cutting slope was researched from the angles of geometric microstructure and damage. The main results as follow： As the unrestrained surface is formed and exposed after slopes are excavated, dried shrink age, stress unloading, saturation softening will cause GRS softening, moreover, when they coexist, their softening effects will be intensified; When GRS is treated by cement grout, its disturbed microstructure will be restored and reinforced to a certain extent, and the softening effects will be weaken; The advanced microstructure geometric model of GRS accords with its micro-features essentially, based on the model, the above-mentioned effects can be explained properly and the landslide micro-mechanism of GRS cutting slopes was revealed. The study conclusions will provide conceptual guidance and consult for design, construction and new technique research of the cutting slope protection.
出处
《山地学报》
CSCD
北大核心
2006年第4期431-436,共6页
Mountain Research
基金
福建省高等学校科技项目(编号:JA03063)资助~~
关键词
花岗岩残积土
开挖边坡
开挖效应
微结构
几何模型
滑坡机理
Granite residual soil, cutting slope, excavation effects, microstructure, geometric model, landslide mechanism
