The optimization design of the section morphology of large-span tunnels plays an important role for saving cost and improving the engineering stability. The flat ratio of tunnel which is as an important control index, its rationality is the key problem in the design of tunnels. Program with Python to set up the dynamic calculation model of a large-span tunnel planned to be constructed which can...

The period of change from pithouse to pueblo as the prefen-ed dwelling in the American Southwest represents an architectural transition associated with greater complexity of community organization. Excavation of more than 70% of the principal residential area within a small) single component) late Mogollon pithouse village (A.C. 1150-1200) in New Mexico (but located near EI Paso) Texas) helpspr...

Two-dimensional and three-dimensional seismic surveys were conducted across the Oquirrh fault, Utah with the purpose of imaging the fault structure to a depth of about 15 m. Results show that the 3-D tomogram clearly delineates the fault zone and a colluvial wedge, both of which correlate extremely well with the geologic cross-section interpreted from an adjacent trench. The thickness of the co...

In view of the problems associated with poor stability coal walls, slide and leakage top-coal at tunnel excavation working face under a soft extra-thick roof, surrounding rock must be strengthened. The theoretical analysis pressure, numerical simulation other methods were comprehensively used to study coal-wall-slicing mechanism. Given characteristics combined supporting technology “coal wall w...

The article presents a method of selecting an arch yielding support for preparatory workings driven in hard coal seam. Particular attention was paid to discontinuous deformation the form fault, which significantly contributes change excavation protection schemes. On basis geometry machines and devices designed excavation, selected, then checked ventilation criterion. In next stage, analytical c...