Damage Mechanism of Road Foundation under Vehicle Dynamic Load in Mined-out Area
With the rapid development of traffic, as ill geology phenomenon, the problem of mined-out area become more and more outstanding. So the research of mined-out area is very important to highway engineering.
(1 )The author comprehensive analyzed the relative research literature, explained the form of mined-out area and the basic characters and rules of upper rock movement, and summarized the sink pattern theories.
Based on over ten years′ engineering experiences,the basic contents such as treating mechanism,treating standard,grouting design,grouting technics,inspections on qualities act about grouting the gob area of coal mine under highway are discussed carefully.
An approximate theory to predict the event of main and periodic roof falls in the goaf behind the long wall face is given.
It describes recently closed collieries and their make of water, and details the migration of these quantities through a variety of roadways and goaf areas to the new lodgement facilities to be installed at Bentinck Colliery.
Consequently, the results obtained by using the fuzzy influence function method can automatically give rise to a shift of the inflection point towards the goaf and asymmetry in shape.
On one approach to calculation of the stress-strain state of a rock mass in the vicinity of a goaf
The stress-strain state of the rock mass is evaluated, with increase in depth of the deposit mining and volume of the mine goaf.
Based on H.263+, by reversing part stream sequences of each Group Of Block (GOB), an error resilient scheme is presented to improve video robustness without additional bandwidth burden.
And applying the catastrophe theory, the influencing factors of induction caving roof are studied in the emptied areas, such as the mechanical property of the surrounding rock, the area of the gob, the scope and dimension of tensile stress.
The results show that the key factor is the area of the gob to the method of the induction caving roof.
In goblet (gob) mutants, the SAM terminates following cotyledon production, but occasionally partially recovers and produces simple leaves.
We examined the recharge sources of acid mine drainage (AMD) seeps that form at the toe of the coal refuse (gob) pile at a site in Indiana, using traditional geochemistry and oxygen isotopes.