袖阀管劈裂注浆加固粉土路基实验研究朱登元.docxVIP

第 34卷 第 8 期岩 土 工 程 学 报Vol.34 No.82012 年 8 月Chinese Journal of Geotechnical EngineeringAug. 2012 袖阀管劈裂注浆加固粉土路基实验研究 朱登元 1，2，管延华 1*，刘惠忠 3，王 倩 3，张庆涛 1 (1. 山东大学土建与水利学院，山东 济南 250061；2. 临沂大学建筑学院，山东 临沂 276005；3. 济南市公路管理局，山东 济南 250014) 摘 要：通过室内大型模拟实验，对粉土路基强度、刚度在毛细水作用下的衰减规律和袖阀管劈裂注浆加固路基的效 果进行研究。实验模拟新建路基、潜水位 20 cm/50 cm 的毛细水作用路基、袖阀管注浆劈裂土体加固路基等 4 个工况， 得到粉土路基土体含水率的分布规律和物理力学指标；在分级循环加卸荷载的作用下，得到路基模型总体刚度、受力 和变形的特性；挖除路基模型，观察袖阀微桩及浆液扩散的形态。结果表明：毛细水作用可使粉土路基模型总体刚度 降低 70%，土体抗剪强度下降，路基竖向塑性变形随荷载增大快速增加；水平分层劈裂土体凝固的浆液不仅阻断了毛 细水的上升通道，而且与底端扩大的微桩形成空间骨架与土体共同作用，骨架与土体各承担荷载大约 50%，袖阀管加 固粉土路基效果显著。 关键词：粉土路基；袖阀管桩法；劈裂注浆；稳定性衰减；室内模拟实验 中图分类号：TU441 文献标识码：A 文章编号：1000–4548(2012)08–1425–07 作者简介：朱登元(1971– )，男，山东沂南人，研究员，博士研究生，主要研究方向为路基路面结构与材料。E-mail: HYPERLINK mailto:zhudengyuan@lyu.edu.cn  zhudengyuan@lyu.edu.cn。 Model tests on fracture grouting reinforcement of silt embankment by using Soletanche method ZHU Deng-yuan1, 2, GUAN Yan-hua1, LIU Hui-zhong1, WANG Qian3, ZHANG Qing-tao1 (1. School of Civil Engineering, Shandong University, Jinan 250061, China; 2. School of Civil Engineering and Architecture, Linyi University, Linyi 276005, China; 3. Jinan Highway Administration, Jinan 250014, China) Abstract: Based on large-scale indoor model tests, the attenuation law of strength and stiffness of silt embankment under the action of capillary water and the reinforcement effect of the embankment by using the Soletanche method are studied. Four working conditions, newly constructed embankment, attenuated embankments affected by the capillary water with different groundwater levels (20 and 40 cm) and fracture grouting reinforced embankment, are simulated. Moisture content distribution, physical and mechanical properties of the silt embankment are detected. General stiffness, force and deformation characteristics of the embankment model are obtained under grading cyclic loading and unloading conditions. Micro-piles and fracture grouting spread forms are observed during the excavation of the embankment model. The