黄土劈裂注浆土体裂纹扩展模型研究  

Study on the Crack Extended Model for Loess with Fracturing Grouting

作　　者：马连生 王腾[1] 周茗如[1] 朱冬梅[3] Ma Liansheng;Wang Teng;Zhou Mingru;Zhu Dongmei(Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou,730050,PR China;school of Science,Lanzhou University of Technology,Lanzhou 730050,P.R.China;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,P.R.China)

机构地区：[1]西部土木工程防灾减灾教育部工程研究中心,兰州730050 [2]兰州理工大学理学院,兰州730050 [3]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《地下空间与工程学报》2018年第4期962-967,共6页Chinese Journal of Underground Space and Engineering

基　　金：甘肃省建设科技攻关项目(JK2014-34)

摘　　要：土体裂纹扩展几何形态是劈裂注浆加固设计中需要考虑的一个重要因素,但土体注浆劈裂的发生、发展过程很难可视化。本文结合兰州新区某快速道路工程K1+662.053段加固工程,通过分析劈裂注浆裂纹扩展走势,研究了黄土地区劈裂注浆对湿陷性黄土的加固机理。并从断裂力学的角度出发,对劈裂注浆过程中土体裂纹在浆液压力下的扩展、止裂行为展开了研究并给出了相应的判断依据,建立了裂纹扩展模型。研究表明:劈裂注浆裂纹形成纵横扩展形式呈张开型,属于I型裂纹;裂纹的扩展行为受注浆压力及土层地应力的影响;浆液在裂纹中通过挤压土体形成浆脉,对土体加固起到骨架支撑作用。The extended geometric shape of soil crack is an important factor in the strengthenment design of split grouting,but the occurrence and development of soil split grouting is difficult to visualize. Based on the reinforcement engineering of the expressway engineering K1 ＋ 662. 053 in Lanzhou New Area,by analyzing the extended trend of fracturing grouting crack,the reinforcement mechanism of collapsible loess with split grouting in loess area was studied. During the process of fracturing grouting,the crack extension and arrest behavior of soil body flaw caused by slurry pressure was studied from the aspects of fracture mechanics,and the crack growth model was established. The results show that the vertical and horizontal expansion caused by fracturing grouting was open type,and it belonged to I crack type; the crack extension was affected by grouting pressure and soil layer stress; the grouting fabric was formed by slurry squeezing soil in the crack,and it can act as a framework in soil reinforcement.

关 键 词：黄土 劈裂注浆 裂纹 断裂力学 扩展行为 判断依据 

分 类 号：TU472.6[建筑科学—结构工程]