Study On Faults With Expansion Soft Rock Tunnel Of Deformation Characteristics

Soft rock question has been met in the underground engineering of the thornyproblem. Although the soft rock problem is well known in engineering, so far, people tosoft rock concept also is vague. Soft rock with loose, broken, easy to deformationcharacteristics, especially in underground excavation, by engineering force influence ismore apparent, often happen roof caving, landslide, piece of help, etc. Further researchof soft rock engineering characteristic and surrounding rock mass deformation law, forengineering construction and theoretical research is of great significance.ChengDu to JianYang fast channel longquan mountain for imports, regional thrustfault-LongQuanYi fault-emergence, formation of vertical fault from10m, fracturezone and its influence bandwidth is about200meters [1].Tunnel in the excavation tothis section, been repeated landslides, roof caving accidents, for most of the way earlyhas different rate lining crack, serious impact on the progress of tunnel excavation andconstruction safety. Based on the actual construction problems inthis paper, have donedeformation law of faults zone with dilatability soft rock, supporting measuresresearched and so on.The main work as follows:(1) Dilatability faults with soft rock engineering characteristics analysis. In atunnel longquan mountain, geological exploration material as the foundation, combinedwith indoor rock mechanics experimental results, this paper analyzes the tunnelengineering geological conditions of the area, focus on the dilatability faults with softrock characteristics.(2) Faults with soft rock tunnel deformation law of expansion. Combined with fieldmonitoring data, the analysis of faults with the dilatability soft rock tunnel deformationchange rule, and BP neural network of surrounding rock deformation forecast.(3) Faults with soft rock tunnel dilatability of the deformation of the numericalsimulation. To optimize the inversion analysis, get the best parameters of surroundingrock of soft rock tunnel construction expansion process of2d,3d finite elementsimulation.(4) Faults with soft rock tunnel expansion deformation control measures. Throughnumerical simulation, the control measures to advance faults with soft rock tunneldilatability of the deformation of the effect analysis and evaluation.