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在边坡加固、高层建筑基坑边墙围护、城市地铁、公路、铁路、矿井巷道等工程中,锚杆(索)的应用极为普遍。此类工程经常构筑在粉土、粉质粘土、砂等非固结性土层中。在这种非固结性土层采用一般的锚杆(索)锚固技术会遇到非常困难的问题,钻孔塌孔、锚固力很小,锚固长度很长。针对这个问题,煤炭科学研究总院北京建井研究所开展了“二次压力灌浆土层应力锚固技术研究”。 该成果的技术关键有三。一是为防塌孔采用的跟管钻进工艺和技术。二是分两次灌浆。第一次灌浆用自然止浆工艺,简便,实用。然后再在适当的时机进行第二次灌浆。此次灌浆为压力灌浆,所用压力视具体情况采用0.8～2.0MPa,即所谓劈裂灌浆。三
In the slope reinforcement, high-rise building foundation pit wall protection, urban subway, highway, railway, mine roadway and other projects, the application of anchor (cable) is extremely common. Such projects are often built in silt, silty clay, sand and other non-consolidated soil. In this non-consolidated soil using the general anchor (cable) anchoring technology will encounter very difficult problems, hole collapse hole drilling, anchoring force is very small, long anchoring length. In response to this problem, Beijing Institute of Coal Science Research Institute to carry out a “secondary pressure grouting soil stress anchoring technology.” The technical key to the outcome is three. First, to prevent cave-in with the tube drilling technology and technology. The second is divided grouting. The first grouting with natural paste technology, simple and practical. Then at the right time for the second filling. The grouting for the pressure grouting, the pressure used by the specific circumstances of 0.8 ~ 2.0MPa, the so-called split grouting. three