Abstract Grouting is an important method to reinforce soft coal roadway, and the presence of primary cracks in body has influence on grouting effect. With discrete element simulation method, process seam was simulated. The mechanism revealed, while fracture characteristics pressure effect analyzed. results demonstrated that involves stages seepage, rapid splitting, slow stability. Due cracks, d...

Penetration grouting technology is an important technical means to improve the mechanical properties of gravel soil layers, and time-varying characteristics Newtonian fluid viscosity have influence on morphology effect penetration grouting. However, these are not considered in current research mechanism In this paper, by studying basic rheological equation fluids its dynamic law, motion discuss...

A loess stratum was selected as the research object, assuming that slurry diffuses in a hemispherical shape during secondary grouting. Based on unified strength theory describing failure characteristics of and critical condition bolt shear failure, pressure value grouting strata determined theoretically. The reliability theoretical analysis verified by numerical modeling realizing large deforma...

Grouting reinforcement was used to improve rock strength and avoid seepage in engineering. A self-developed visualised test platform developed the influences of different fracture openness on grouting diffusion modes were revealed; Bingham rheological model imported simulate process a single plate fracture, spatiotemporal distribution velocity field under obstructions determined using finite el...

One type of seepage water that is difficult to plug by grouting the exuding through pores sandstone in deep underground engineering. Aiming at this problem, paper collected deep-mine samples from Southwest Shandong coalfield, studied pore structure and its influential factors casting thin slices, scanning electron microscopy, mercury intrusion physical property tests, selected five representati...

Mosul Dam is located on the River Tigris about 60 km north of city in Iraq. The dam a multipurpose earth fill with storage capacity 11.11 million cubic meters, which was operation since 1986. During first impounding its reservoir, seepage water underneath foundation noticed due to desolation gypsum beds. This raised concern stability and then grouting were carried out. ISIS occupied 8 - 16 Augu...

Grouting is a common method of reinforcing fractured rock mass. The mechanical property grouted major aspect the reinforcement effect, which depends on geometry crack, angle (β) between load direction and other factors. Few studies have focused with bi-directional crack can reflect well grouting in stratum developed fractures. To explore effect mass, uniaxial compression tests were carried out ...

INTRODUCTION China's largest cities like Beijing and Shanghai have seen a sharp increase in subway network development as a result of the rapid urbanization in the last decade. The cities are still expanding their subway networks now, and many shield tunnels are being or will be constructed in close proximity to the existing operational subway tunnels. The execution plans for the new nearby shi...

The penetration paths of grouts in sand layers are tortuous, and there is no reasonable grouting theory at present. By employing tortuous circular tubes as the internal pore channels layer, cylindrical diffusion model established for sand-layer grouting. First, permeability porous media average velocity Bingham slurry were deduced by considering tortuosity. Second, based on continuity equation,...

Increase in downhole mining prompts the need to develop effective methods for maintenance of shafts. Currently, grouting behind shaft wall is main approach used prevention water seepage into shaft. Several factors determine effect, and often fails during field applications due use ineffective parameters. In present study, numerical simulation was performed evaluate slurry diffusion regularity u...