Analysis of Monitoring and Numerical Simulation on Anchor Force of Foundation Pit

Pile anchor supporting structure is a common method in deep foundation pit engineering. To a certain extent, anchor forces can reflect the earth pressure acting on the supporting structures. In the process of the deep foundation pit construction, the layers with different types of groundwater are often encountered. Improper control of groundwater may lead to engineering safety problems and many other cases which can cause bad effects on the surrounding environment. Therefore, it is of practical significance to conduct the optimal designs for supporting structures of deep foundation pit by monitoring the anchor forces in-situ. Through studying and analyzing the monitoring data, the earth pressure’s magnitude and distribution law can be further understood. In this paper, foundation pit engineering is taken as a base, a whole monitoring of the actual anchor forces is made in the process of tensioning, locking and working of anchors, and the monitoring data is analyzed. A numerical analysis based on the fluid-solid coupling theory of unsaturated soil is performed, and tests of the soil water characteristic curve (SWCC) for typical unsaturated soil are carried out. Finally, the test results are applied to numerical analysis. The results of anchor forces calculated by considering the coupled condition and ignoring the groundwater’s effect are compared with the monitoring results of engineering site. The comparison indicates that numerical results are inconsistent with measured results. The numerical results are close to the measured results only when the fluid-solid coupling theory of unsaturated soil is considered.

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W artykule przedstawiono wyniki badań dotyczących budowy głębokich fundamentów oraz ich utrzymania, w odniesieniu do ich odporności na pojawiające się czynniki (siły) zewnętrzne. Analizie poddano dane dotyczące sił kotwiczących fundamentów, zapewniających stabilność budowli, a w szczególności tzw. roztwór glebowy. Otrzymane wyniki zostały porównane z wynikami badań nie uwzględniającymi roztworu glebowego oraz wielkościami pomierzonymi. W ten sposób wykazano duży wpływ tego czynnika na wyniki analiz.