[en] Through the surface of the patio or shaft construction in weathered rock layer and surface soil, it is one of the problems in the construction of roadway excavation. Introduced a mine shaft were used mining method from the top to down construction method (i. e. a general construction method) that is common through two main filling Patio, using the method from down to top of digging through the mountain tunneling of two main return air patio is successful practice of less investment and high speed, point out the conditions for its application. The latter method is neither a general construction method, nor is it a special construction method
Source
Chinese Nuclear Society, Beijing (China); 182 p; ISBN 978-7-5022-5604-3; 
; Oct 2012; p. 130-132; 2011 academic annual meeting of China Nuclear Society; Beijing (China); 11-14 Oct 2011; 3 refs.
; Oct 2012; p. 130-132; 2011 academic annual meeting of China Nuclear Society; Beijing (China); 11-14 Oct 2011; 3 refs.