Z.S. Chen, G. Hofstetter, H.A. Mang:
"3D-Boundary Element Analysis of the Lowered Groundwater Level for Tunnels Driven Under Compressed Air";
International Journal for Numerical and Analytical Methods in Geomechanics, 15 (1991), S. 735 - 752.

Kurzfassung englisch:
A direct boundary element method for the iterative analysis of the lowered groundwater level and the steady-state airflow in porous soil for tunnels driven under compressed air is presented. The soil may be zoned and anisotropic. It is shown that disregard of the compressibility of the air leads to results for the excess air pressure and the flow of air through the surface of the soil, which are on the unsafe side. The lowered groundwater level is determined by means of an iterative procedure. During the iteration large changes of the shapes of boundary elements may occur. In order to reduce the resulting danger of divergence of the iteration, the boundary element mesh is adapted suitably in the course of the iteration process.

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