It also can t avoid dual payment in advance and could t decrease storage space.

Study on laneway excavation monitoring and best secondary support time with new austrian tunnelling method;

In order to determine the secondary support time and intensity,the changing rules of the stress and deformation speed of surrounding rocks with time,the effects of the secondary supporting time and intensity of surrounding rocks on deformation were analyzed using exponential creep model of FLAC2D at west tunnel in the Guhanshan Mine of Jiaozuo Coal Industry Group.

Ground reinforcement of the connecting aisle is finished successfully through strictly controlling key construction measures such as freezing holes construction,freezing station installation and secondary support.

Practice of second support theory applied to deep mine soft rock section chamber support;

The author introduces the second supporting technology,which is worth popularizing in roadway construction instead of previous supporting methods to solve the problem of large ground pressure in deep collieries.

After the incipient supporting,second supporting should be carried out through technical monitoring,which offers comparatively correct temporal foundation,in order to decrease the quantity of deformation and technical.

States the technique experience that the influnce of dynamical pressure on secondary supporting of gob entry is avoided in a haulage center gate when double unit faces are adopted in soft rock mines.