预应力锚杆复合土钉墙工作性状试验研究  

Test study on working properties of prestress anchor composite soil nails wall work

作　　者：彭文祥[1] 谢雨军 徐松山 王苑 钱华 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]大连市勘察测绘研究院有限公司,辽宁大连116021 [3]中国有色金属长沙勘察设计研究院有限公司,湖南长沙410011 [4]航天时代置业发展有限公司,北京100035

出　　处：《中南大学学报（自然科学版）》2015年第4期1468-1474,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50878212);湖南省自然科学基金资助项目(11JJ6042);中南大学教师研究基金资助项目(2013JSJJ003)~~

摘　　要：以预应力锚杆复合土钉支护结构为研究对象,在室内模型试验基础上,探讨预应力锚杆复合土钉支护结构的工作性状。模型试验分纯土钉支护试验和预应力锚杆复合土钉支护试验2组,根据试验成果,对预应力锚杆复合土钉支护结构的工作性状进行分析研究。研究结果表明:土钉(锚杆)由于注浆作用,其黏膜聚力、内摩擦角和弹性模量都增大,但在复合土钉支护中增大得更多;复合土钉支护方式能有效控制坡面位移,其坡面最大位移较纯土钉支护降低约14%,使基坑潜在滑动面有向上移动的趋势,表明预应力锚杆复合土钉支护方式大大提高了基坑的稳定性。By taking the prestress anchor composite soil nailing structure as object, the working properties of the prestress anchor composite soil nailing were analysed based on indoor model test. The final model test was divided into two groups, i.e. the pure soil nailing test and the prestress anchor composite soil nailing test. The work traits of prestress anchor composite soil nailing structure was analyzed according to the test results. The results show that, due to the effect of the grouting role, the cohesion, angle of internal friction and elastic modulus of soil nails（anchor） increase, and those of compound soil nails increase much more.Displacement of slope can be effectively controlled by the compound soil nails, and the maximum displacement decreases approximately by 14% compared to that of the pure soil nails,which can make the potential sliding surface of the pit have the trend to move up. It is demonstrated that the method of the prestress anchor compound soil nails improves the stability of the pit.

关 键 词：预应力锚杆 复合土钉 工作性状 模型试验 

分 类 号：TU473[建筑科学—结构工程]