Abstract Based on the principle of virtual power, equilibrium conditions are established for forces within a cross section tunnel top heading driven according New Austrian Tunneling Method (NATM). External forces, namely impost actions and ground pressure distributions following third-order polynomial, analytically linked with internal such as axial bending moments, arising integrals over shell...

In response to the severe floor heave problem of the+1100m track crosscut in Liuyuanzi Coal Mine, it was found that exists a hard top and soft bottom surrounding rock environment. FLAC3D simulation used study stress, plastic zone, displacement when is supported by bolt-mesh+Shotcrete+36U-type steel combined support circular shed support. The results show latter reduces 57%.