We have acquired with our engineering very effectively on the research of integral optimization of formwork of strut system by using the method of the second strut that the top of pillars can be taken apart beforehand multifunctionally.

Using the coefficient determinant and translation transformations,we discuss the positional relationship between a quadratic cylinder and a plane,which is involved the invariant of the quadratic surface and the invariants of the section of the quadratic surface,starting with discussing the positional relationship between a conic and a line.

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;