| Centrifugal model experiments and field tests are put forward in the paper to synthetically study the characters of soil similar slope and its reactivities to anchor cables.The geologic model, categories, failure modes and collapse mechanism of soil similar slope are brought forward. Centrifugal models of Reinforced slope by prestressing anchor calbes are studied and devised. The tensile force in anchor cables is measured for the first time in centrifugal during running of centrifuger, and on the base of the measuring, the diffuse of the tensile force in the slope is studied. The frame-characters and odditional internal stress under anchor force are studied and calculated basing centrifugal model experiments and field tests. The analysis of slope stability is divided up into two moments respectively named coupling moment and releasing moment from coupling. The research work involves several aspect as follows:l.The concept of soil similar slope has been sophisticated.According to the formation of the slope medium, soil similar slope are categorized into three kinds,that is completely weathered or strongly weathered soft rock slope, completely weathered or strongly weathered hard rock interphase with soft rock slope and completely weathered or strongly weathered hard rock slope. The failure modes and collapse mechanism of soil similar slope are brought forward.2.The mathematical model of reinforced slope by anchor cable frames in centrifugal test has been advanced, which will provide academic theory. The measuring of strain in cable, bending moment in spar, diffuse of tensile force in slope are accomplished. Basing above, by centrifugal model tests, the collapse oderliness of weathered granite slope is discovered that the obliquity and height of a slope are fit for Masilofu equation which can be used for the design of the kind of slope.3.A new anchor-soil interface model has been put forward in which the displacement of the soil near the interface plays a importantrole.basing the studying on the existed models. The displacement of the soil in anchored segment has different moments as follow: relative displacemen of particles, shearing strain and macroscopical displacement. And the decrease mechanism of tentile force in cables is analyzed.4. The diffuse area of anchorage force applied by anchor cable and anchor cable frame is respectively calculated.The results suggest reasonable intervals of cables. Centrifugal model tests were carried out, and the collected data almost agree with the calculated results.5. The mechanisms of reinforcing similar siil slopes by prestressed anchor cable sash(beam)are studied by the method of combination of field test and centrifugal modes test, theory analysis. As a result, the calculational pattern of internal ofrce of anchor cable beam is put forward. The new calculational pattern can optimized the design of anchor cable beam.6. The analysis of slope stability is divided up into two moments respectively named coupling moment and releasing moment from coupling.The formula about slope stability in coupling moment has been brought out considering that the action spot of anchorage force is on slope surface. And the stabilty in releasing moment, the displacements of soil along the slide surface are put great emphasis on. The calculation method of the sheraing force between the paste and soil is put forward.7.The example has make a conclusion that the existing calculation methods of slope stability gives a smaller stability factor, and then they will result in a larger investment.The paper involves several innovations as follow: The concept of soil similar slope has been sophisticated, and according to the formation of the slope medium, soil similar slope are categorized into three kinds. Centrifugal model test is used to synthetically study the slopes reinforced by anchor cable and cable beam for the first time. On the base of the data from field tests and centrifugal tests, the new calculation methods about slope stability and interval force of beam are...
|
PDF Full Text Request