Study On The Restructuring And Mechanical Properties Evolution Of Argillaceous Weakly Consolidated Rock

Argillaceous weakly consolidated rock mass as a special type of soft rock, its mechanical property is easily degradation affected by environmental factors, which affect the correlative engineering building and construction. However, the broken structure of argillaceous weakly consolidated rock could reorganize by itself in a certain both store environment and stress environment, and the restructuring rock has a certain mechanical strength.Taking the argillaceous weakly consolidated rock mass with three different clay mineral content as the research object, which were drilled from the cretaceous strata of a coal mine named Xiyi located in the west of Inner Mongolia, several experiments were carried out, such as both the water loss and water absorption experiment of argillaceous weakly consolidated rock, restructuring experiment, and mechanics experiment of restructuring rock, and combining the theory of damage mechanics and numerical simulation, systematic research, for instance, the stability of surrounding rock of roadway and the restructuring evolution mechanism of argillaceous weakly consolidated rock based on the impact of occurrence environment, were carried out as well. The main work and research results are shown as follows:(1) Based on the analysis of X-ray diffraction, scanning electron microscope, liquid and plastic limits, mechanical properties of the original rock sample, etc. the evolution law of the basic physical and mechanical properties of argillaceous weakly consolidated rock, changing along both the moisture content and the clay mineral content, are obtained which lay the foundation for the study of the restructuring evolution mechanism of argillaceous weakly consolidated rock.(2) Based on the self-developed high precision test system of the water loss and water absorption experiment of argillaceous weakly consolidated rock which integrating monitoring and recording as one, and to formulate the reasonable maintenance sample size and the experiment scheme, in addition, to introduce the quartz sand material as the comparison, the evolution law of water loss and water absorption of argillaceous weakly consolidated rock with different clay minerals content affected by store environment are obtained, and the regulating effect of clay mineral on the water loss of the argillaceous weakly consolidated rock effected by store environment are obtained as well.(3) Based on the improved restructuring test apparatus, to carry out the reorganizing experiment of the broken structure of argillaceous weakly consolidated rock in the condition of different constraints, clay mineral content and load respectively, the restructuring evolution mechanism of argillaceous weakly consolidated rock is obtained, and based on these restructured rock sample, to carry out uniaxial and triaxial mechanics experiment by the GDS triaxial experiment system, the evolution regularities of the mechanics characteristics of the restructured argillaceous weakly consolidated rock changing along the clay mineral content and moisture content are obtained as well.(4) Based on the experimental data, starting from the basic theory of damage mechanics, combined with statistical strength theory and the theory of yield criterion, etc. the hydration- mechanical coupling damage constitutive model of argillaceous weakly consolidated rock is established, and the extended definition of rock damage is stated.(5) Synthesizing the affect of these factors on the stability of surrounding rock of roadway, such as the moisture content of the rock stratum, moisture content influence radius and water quantity of surrounding rock affected by store environment, the depth of rock stratum, coefficient of lateral pressure, clay minerals content of rock mass, etc. and according to the numerical simulation respectively, the evolution rule of the stability of the surrounding rock of roadway are obtained, influenced by the above complex conditions in the rock stratum of the argillaceous weakly consolidated rock. And based on the self-developed secondary numerical calculation procedure, these deflection rules of the principal stress after excavation in the rock stratum of the argillaceous weakly consolidated rock were obtained.