During the construction of tunnels in saturated water-bearing sand stratum, water and mud inrush disasters often occur. Grouting is most convenient effective method to improve mechanical properties soil prevent groundwater seepage. The reasonableness Discrete Element Method (DEM) contact parameters verified by comparing repose angle test with that obtained simulations. grouting model stratum wa...

This paper introduces a case study on the failure mechanism and support design of roadway tunnel in fault fracture zone 106 mining area Yuandian no.2 coal mine. Based on-site geological conditions (in-situ stress test, borehole television imaging, lithological analysis), was studied. The test results showed that high tectonic stress, fractured rock, poor lithology are primary reasons for instab...

Prefabricated concrete structure is an important aspect of the building development in China, while grouted sleeve connection represents a key tool for on prefabricated parts. Various grouting defects may arise during prefabrication and actual construction processes, thereby causing unsafe among components. Here, we report determination mechanical properties full-grouted with defects，using defe...

When the tunnel and underground engineering construction encounters water-rich soft broken surrounding rock, it is very easy to occur serious disasters such as mud inrush, water inrush collapse, threatening safety of construction. Taking ultracataclasite stratum exposed by 4th branch Xianglushan Tunnel in Central Yunnan Water Diversion Project an example, this has strong compactness, weak perme...