| The dilatational strain of swelling rock is one of the most difficult problems in the field of engineering geology and rock mechanics. At present, many tests on dilatational strain and research on swelling constitutive relationships have been carried out. However most of these tests and research are based on plenteous water supply. Because of the complex swelling mechanism and various factors which influence the dilatational strain, to find out the major factors and to establish an accurate and simple swelling constitutive relationship is the key to swelling rock research. Based on the laboratory swelling experiments, the influence of water content and the axial loading on the dilatational strain and the relationship between swelling pressure and water content of swelling rock in Hongshanyao project is systematically studied in this thesis. The main research work includes:1. By using the swelling-odometer we made ourselves, we have performed lateral restricted swelling test and swelling pressure test.2. By using the RMT-150B servo rock testing system, we have performed uniaxial compression test and analysed mechanical parameter of swelling pressure at different water contents.3. By analysing testing data, we do a study of relations between lateral swelling strain and water content, between lateral swelling strain and axial loading, and between swelling pressure and water content.4. A lateral restricted swelling constitutive relationship, in which the effect of water content and axial loading are considered, has been proposed.5. By using the testing data of laboratory test, field test, and tests of swelling rock of the Nanjing Meishan Ferrous Mine, the swelling constitutive relationship proposed in this thesis has been proved.6. By using the lateral swelling constitutive relationship, foundation deformation of buildings at Hongshanyao hydraulic engineering has been estimated and ground improvement methods have been suggested.
|
PDF Full Text Request