In tunnel design and construction, proper accurate classification of rock surrounding tunnels is needed to ensure construction safety, guarantee quality, reduce project costs. With rapid urbanization, numerous small clear-distance have been constructed in dense urban road networks. Compared with ordinarily separated tunnels, the scale difficulty are greater, requirements for accordingly higher....

Topographical material surface features are sensed by cells and provoke a large range of cellular responses. We recognized earlier, that at micropillar topographies in the range of 5 µm, the osteoblasts attempt to phagocytize the pillars resulted in increased energy requirements and reduced osteoblast marker expression, e.g., collagen type I and osteocalcin. However, the precise cellular signal...

The application of roof-cutting and pressure-relief gob-side entry retention plays a critical role in controlling the stability surrounding rock at entry, easing continuity tension improving resource recovery ratio. excavation 360,803 airway Xinji No. 1 Mine is affected by intense mining 360,805 working face. Hence, to address problem airway, mass blast weakening theory was used this study anal...