岩土工程学报2016，Vol.38Issue(10)：1783-1788,6.DOI:10.11779/CJGE201610006
旋喷锚杆锚固体直径计算方法及影响参数试验研究
Method for anchorage body diameter of jet grouting anchor andtests on influence parameters
摘要
Abstract
The anchorage body diameter is the key factor of the pullout resistance and the reliability of jet grouting anchor. Based on the physical process of jet grouting breaking soil, a convenient calculation method for anchorage body diameterfor application is proposed.For the support of 32m deep-foundation pit in SanmenNuclearPowerStation, in situ testsare designed to validate the proposed method by comparing 3 excavated anchorsof the 12 test anchors. The effect of jet parameters on the anchorage body diameteris also analyzed. The results reveal thatunder the influences of incompletebreadage and large particle sedimentation of soil, the calculated diameters are smaller than the test data, and the difference between themis larger when the jet pressureis lowerandthe drilling speed is faster. The jet grouting anchorwith flake burrs in surface is approximate to ellipse in shape because of the spiral motion and vibration of the drill pipe.Thehigherthejet pressure, the fasterthedrilling speed, leading to more irregular shape.Under the same condition, reaming quality is better by increasing the nozzle diameter and using two times of reaming.In order to improve the reaming efficiency andtoavoid the appearance of discontinuous jet profile,thedrilling speed should be designed inasuitable range.关键词
旋喷锚杆/锚固体直径/影响参数/现场试验Key words
jet-grouting anchor/anchorage body diameter/influence parameter/in situ test分类
建筑与水利引用本文复制引用
路威,秦景,娄鹏,李海玲,高霈生..旋喷锚杆锚固体直径计算方法及影响参数试验研究[J].岩土工程学报,2016,38(10):1783-1788,6.基金项目
中国水利水电科学研究院青年科研专项基金项目 （）
