Rock Tunnel Excavation Three-Dimensional Model Numerical Implementation And Analysis Based On Digital Photography Technology

For the slope and underground excavation engineering, as the nature rock was cut by a series of faults, bedding surface, compressed zone and joint fissure, then form a complex discontinuous medium region. Once the block of tunnel is instability, the unstable rock will slip along the structure face or the slip plane that formed by the rock bridge and joint plane. Especially the structural plane, its strength parameter is directly related to the stability of underground engineering and the driving forces calculation, and even directly affect the support treatment, so it play a most basic role at engineering progress, engineering safety and engineering cost. Therefore, in the stability analysis of underground, it’s very important to identify the geological conditions and geological characteristics of geotechnical engineering. If we could accurately get the structure changes in the front working face, we could arrange the driving progress in time and reasonable, revise the construction plan, arrange protective measures and avoid the occurrence of many dangerous.The traditional measuring method is used the measuring tape and compass to get the information of structure plane by contact. This method is inefficient, laborious, time-consuming, difficult to meet the requirements for rapid construction. Some of stope and tunnel roof cannot fully contacted, measurement data always restricted by engineering. In this paper, base on the status of rock tunnel stability analysis, using the modern digital photography processing technology and3d image reconstruction to make analysis, based on the field geological data and image information collection, build the three-dimensional imaging of the tunnel face, make the discrete element method stability analysis at disturbed areas of the tunnel excavation. The main research content are as follows:The article analyzes in detail is that:Firstly, using digital photography measurement get the joint plane information of rock mass. Using high-pixel digital camera as the information collection tool. Using3gsm analysis software get the space coordinates of joint fissure points and the trace length, geological occurrence of joint fissure; Then make a research at the determining strength parameters of rock mass joint, obtain the joint strength parameters which suit this tunnel project rock mass; Choose the parameters of rock mechanics information, used the trace length, geological occurrence of joint fissure information that getting from digital photography measurement. Build the disturbed zone model that after the cut of joints by discrete element method; Base on ERDAOHEZI rock tunnel excavation engineering, Simulate the bench cut excavation method by discrete element method. The results show that the block was fall down at vault area, with a stress concentration.