高压旋喷锚索在全砂地层深基坑中的应用研究

Design and Practice of Steel Pipe Pile Cofferda m in Full Sand Formation of River Channel

全砂层地质条件下,普通锚杆施工时易出现塌孔、涌砂等情况,地层很难达到锚固承载力设计值。为探究高压旋喷锚索在全砂地层深基坑中的应用效果,以陕西省某医院基坑工程项目为例进行研究,介绍了高压旋喷锚索基本原理及特点,通过现场试验分析了高压旋喷锚索在全砂地层中的抗拔承载力,并对基坑变形监测数据进行了分析。结果表明:高压旋喷锚索可有效解决全砂地层锚索成孔难的问题,且锚索抗拔力大,具有良好的工程应用前景。

Under the geological conditions of all-sand layer,the ordinary anchor construction is prone to collapse holes,sand gushing,etc.,and it is difficult for the strata to reach the design value of anchorage bearing capacity.In order to investigate the application effect of high-pressure rotary spray anchor cable in deep foundation pit in all-sand stratum,a hospital foundation pit project in Shaanxi Province is taken as an example for research,the basic principle and characteristics of high-pressure rotary spray anchor cable are introduced,the pull-out bearing capacity of high-pressure rotary spray anchor cable in all-sand stratum is analysed through on-site test,and the deformation monitoring data of the foundation pit is analysed.The results show that the high-pressure rotary spraying anchor cable can effectively solve the problem of difficult to form holes for the anchor cable in full sand stratum,and the anchor cable has a large pull-out resistance,which has a good engineering application prospect.