关键词: 岩土锚固, 基坑支护, 充气锚杆, 膨胀控制, 极限承载力

Abstract: The existing aerated anchor has some shortcomings, such as small bearing capacity, explosive air bag, and unapplication in engineering. By adding end baffle and side guard plate for air bag of aerated anchor, the aerated anchor with end baffle and the aerated anchor with side guard plate was invented respectively. The aerated inflation controlled anchor was then developed by adding the earth-squeezing steel plate in the structure of the anchor, which changes the way of transmission of the anchor. It has the advantages of large bearing capacity, stable performance and complete recovery, and the overall structure of this anchor is simpler and more practical. Full-scale indoor and outdoor tests of the three kinds of anchors were carried out respectively. The maximum aeration pressure of the aerated inflation controlled anchor in tube piece type can reach 0.6 MPa, which is 5 times the existing aerated anchor. The maximum ultimate bearing capacity of the anchor section per meter is 40 kN, which is 60 times the existing aerated anchor. At the same time, the formulas for calculating the bearing capacity of the aerated inflation controlled anchor in tube piece type are deduced and verified, and facilitates the practical application of the anchor.

Key words: geotechnical anchorage, foundation pit support, aerated anchor, expansion control, ultimate bearing capacity