Permeation grouting is widely applied for its low grouting pressure and minor
disturbance to the stratum in grouting engineering, especially in engineering
with strict requirements on ground settlement. However, permeation grouting
theory lags behind compared with other engineering disciplines, and the
theoretical formulas now available cannot accurately be used to guide grouting
engineering desig... hiện toàn bộ
The strata of Jurassic was divided into three tectonic sequences and eight
sequences of third rank, according to the developing feature of the tectonic
inconformity and the transforming feature of the depositional system tracts.
Also the identification and the division of the base-level cycle of different
period were carried through. Therefore three cycles of super period, eight
cycles of long per... hiện toàn bộ
To investigate the water-inrush process due to floor heave, simulation model was
made and factors of mining height, immediate roof strength, water pressure,
depth and strength of confiningbed, excavation step distance and bury depth were
analyzed by using UDEC software. Five zones theory (containing two maximum main
stress circles and three maximum main stress stratiform zones) along excavation
di... hiện toàn bộ