The Field Pull-out Tests And Computation Of Distribution Of Shearing Force Of Pressure-type Anchor

In civil engineering, geotechnical anchoring is applied more and more widely. For a long time, wholly grouted anchor is usually applied interiorly and the interrelated research and analysis have been mature and sufficient. However, along with the increasing of construction quantity of the infrastructure of irrigation works, traffic, communication etc., newer and higher requirement of geotechnical anchoring are made in slope, major dam, bridge, tunnel, deep foundation ditch engineering and the construction engineering such as anti-capsize, anti-float, anti-slippage engineering of the buildings. For example, self-intension of rock and soil is required to exploit better; carrying capacity of anchor increase according to anchoring length; anchor should be sufficiently lasting and should not influence the exploitation of adjoining stratum. And wholly grouted anchor used widely can not meet these demands.With a view to the new pressure (dispersive) anchor and according to the collected documentations, Chapter 3 dissertates the research actuality, expatiates the anchorage mechanism, and bring forward the computation module for calculating the distributing of shearing force of anchor. In the computation module, Mindlin formula is applied to calculable the displacement of the rock (soil). Based on the presumption that the rock (soil) and the anchor has the same displacement at the interface, the equation of displacement of rock (soil) and the anchor is made. The distribution of the shearing force along the rod can be obtained. In process of analysis, standard calculating software MATLAB is used to compute some examples and draw the shearing force distribution curve. Then the distribution character was obtained throughway the analysis of this picture. At the end of the chapter 3, the advantaged effect of radial dilatation of tail grout to friction intensity is simply analyzed according to the reciprocal theorem of work.In our country, no pull-out test of pressure-type anchor has ever been made in rock till now. In Chapter 4, consulting some pull-out tests of pressure-type anchor made by some civil researchers, contrast pull-out tests of pressure-type and tensile-type anchor in rock is designed in crag slope engineering in Chongqing University. The pressure-type anchor rods are designed by ourselves through study some reference documents. The P~s curves are gotten. Loading transmission characteristics of pressure-type anchor and tensile-type anchor are compared through the study of pull-out tests of those two typesof anchor. Factors influencing the bearing capacity of pressure-type anchor are described. The research results of this dissertation give some valuable reference for design and applying pressure-type anchor in practical engineering.