摘要
通过分析湿陷性黄土的组成结构、湿陷机理、力学性能,研究了外界荷载作用下湿陷性黄土的变形及破坏机理;在湿陷黄土中做原位水泥浆液注浆加固试验,分析了注浆过程中不同时间段两者之间的相互作用;对注浆后土体纹理结构以及变形进行分析,研究了水泥浆液在湿陷性黄土中的加固机理;采用弹性力学和断裂力学进行理论计算,研究了水泥浆液与土体之间在注浆过程中的相互作用。结果表明:水泥浆液注浆对湿陷性黄土能起到有效的加固作用;湿陷性黄土注浆过程中水泥浆液造成湿陷量极小,并在压力作用下能够迅速对湿陷进行补偿;水泥浆液在黄土中的加固机理包括填充注浆、劈裂注浆、压密注浆,控制注浆压力能有效实现在湿陷性黄土中的压密注浆、劈裂注浆。
By analyzing the structure composition,collapsibility mechanism and mechanical properties of collapsible loess,the deformation and failure mechanism of collapsible loess under external loads were studied.The in-situ cement slurry grouting reinforcement test was carried out in collapsible loess,and the interaction during grouting processes at different time was analyzed.The consolidation mechanism of cement slurry in collapsible loess was studied by analyzing the texture and deformation of soil after grouting.The interaction between cement slurry and soil during grouting was studied by means of elastic mechanics and fracture mechanics.The results show that cement slurry grouting can effectively reinforce collapsible loess.During the grouting process of collapsible loess,the collapsibility of slurry is very small,and the collapsibility can be compensated quickly under the action of pressure.The reinforcement mechanism of cement slurry in loess includes filling grouting,splitting grouting and compaction grouting,and controlling grouting pressure can effectively realize compaction and splitting grouting in collapsible loess.
出处
《建筑科学与工程学报》
CAS
北大核心
2017年第6期65-70,共6页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51168031
51468039)
甘肃省建设科技攻关项目(JK2014-34)
关键词
湿陷性黄土
力学特性
加固机理
注浆
水泥浆液
劈裂
structure composition
collapsibility mechanism
mechanical properties
collapsible loess
deformation
failure mechanism
collapsible loess
external loads
in-situ cement slurry
