To judge about the performance of designed support system for tunnels, structural forces i.e. peak values of axial and shear forces and moments are critical parameters. So in this study, at first a complete database using finite element method was prepared. Then, a model of artificial neural network (ANN) using multi-layer perceptron was developed to estimate lining structural forces. Sensitivi...

The tunnel lining segments are assumed to be rigid, and the tensile, compression, shear, bending properties of joints considered. A simplified calculation method for dynamic response structure under ground shock is proposed, its correctness verified by comparing it with results from finite element method. Using this method, a subway calculated, change in joint force studied, influence angle bet...

assessment of tunnel face stability in unsaturated media based on limit analysis method mohammad amin nozari; mohammad maleki; behnam yousefi             analysis of the causes of contractor’s claims in the db contracts of underground projects in iran hadi talkhabi; majid parchami jalal; mahmood golabchi                         quality assessment of segmental lining installation in mechanized e...

The anatomical diffusing factors (ADFs), defined as the ratio of surface area to the thickness of the diffusion barrier, of possible respiratory surfaces of adult amphioxus (Branchiostoma lanceolatum) were evaluated using stereological methods. The ADF is greatest for the lining of the atrium and for the skin covering the segmental muscles. Calculation of the diffusing capacities for O(2) revea...

Abstract Segmental lining is subject to significant upward buoyancy forces when a grouting material (slurry), initially fluid, adopted fill the gap between its external profile and wall of tunnel excavated with TBM machine. The analysis effects these important in order correctly dimension segmental avoid damage subsequent costly maintenance restoration actions. Given complexity behavior consist...