(北京中岩大地科技股份有限公司, 北京 100041)

摘要: 针对高压旋喷锚杆在使用过程中存在的注浆体强度低、预应力损失快等问题,结合杭州市萧山区某软土地层基坑工程,对高压旋喷锚杆的施工工艺进行了改进. 在施工过程中通过设置换浆通道,可有效提高注浆体的抗压强度,降低较高承载力高压旋喷锚杆的施工难度. 针对高压旋喷锚杆在软土地层中很难具有较高、较稳定承载力的情况,对高压旋喷锚杆进行基本试验、蠕变试验. 通过试验结果分析,给出了锚杆在软土地区承载力标准值的确定原则,并通过锚杆轴力监测结果对该原则进行了验证.

关键词: 基坑工程; 软土地层; 高压旋喷锚杆; 基本试验; 蠕变试验; 换浆通道

中图分类号:TU753,TU473 文献标志码:A 文章编号:1002⁃848X(2022)08⁃0131⁃04

DOI:10. 19701 / j.jzjg.20200855

Experimental study of high⁃pressure rotary jet anchor in foundation pit in soft soil area

ZHANG Xing

(Zhongyan Technology Co., Ltd., Beijing 100041, China)

Abstract: Aiming at the problems of low strength of grouting body and fast pre⁃stress loss during the use of high⁃pressurerotary jet anchor, combined with a foundation pit project in a soft soil stratum in Xiaoshan district, Hangzhou City, theconstruction technology of high⁃pressure rotary jet anchor was improved. By setting the slurry exchange channel during theconstruction process, the compressive strength of the grouting body can be effectively improved, and the constructiondifficulty of high⁃pressure rotary jet anchor with higher bearing capacity can be reduced. In view of the fact that it is difficultfor high⁃pressure rotary jet anchor to have high and stable bearing capacity in soft soil, the basic test and creep test of thehigh⁃pressure rotary jet anchor were carried out. Through the analysis of the test results, the determination principle of thebearing capacity standard value of anchor in the soft soil area was given, and the principle was verified by the monitoringresults of the axial force of anchor.

Keywords:foundation pit project; soft soil area; high⁃pressure rotary jet anchor; basic test; creep test; slurry exchangechannel

第一作者:张兴,硕士,高级工程师,注册土木工程师( 岩土),主要从事岩土工程的设计与新技术的研发工作,Email:zhangxing925@ aliyun.com.

[引用本文] 张兴. 高压旋喷锚杆在软土地区基坑中的试验研究[J]. 建筑结构,2022,52(8):131⁃134,59. ZHANGXing. Experimental study of high⁃pressure rotary jet anchor in foundation pit in soft soil area[J]. Building Structure,2022,52(8):131⁃134,59.