Evaluation Of The Local Stability Of Rock Faultage Zones In Shenzhen Luohu Jiancheng District

Research on the engineering disaster caused by faultage fracture zones is of great economic significance and also a complicated subject. How to complete constructions safely, economically and effectively in such geological circumstance is always a challenge to many experts in rock mechanics and engineering geology. Ground tensile deformation and asymmetry settlement caused by the creep of fault zones will bring a tremendous damage to the buildings on the surface. The movement of the faultage fracture zones will also influence the local stability of a city and the ground deformation.After consulting a great amount of domestic and foreign related datum, mainly taking Shenzhen Luohu fracture zones for research object, some systemic research have been done by means of analysis on locale monitoring datum analysis, laboratory routine rheopectic testing and the finite element numerical method. Luohu Jiancheng district is compartmentalized based on evaluations of the stability of rock fault zones in it with the analysis results.The experimental and analytical results show that rocks do not lose the load-carrying capability completely after reaching the peak of strength under uniaxial compression, and can still work. Under triaxial compression, the peak and remained strength of rocks both increase with the confining pressure. After the stress peak the brittle deformation disappears and the plastic deformation occurs, in the meantime water can weaken the strength of rocks; the time-dependent behavior (creep) of rocks is distinct in the region of high stress and when the rock material is soft. The measure of fracture displacements and the numerical simulation of the FEM indicate the possibility of movement of Luohu fracture zones, however, the lever of the movement in the region is relatively low, and will not cause great geological disaster. Luohu district can be divided into stable, relatively stable and basically stable region which include four primary and three secondary ones. The stability lever of different regions can be distinguished easily from the geological division map, which is of great significance to the future construction design and city planning in Luohu district.