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Abstract As an important research method，geomechanical model test is used to analyze the deformation and stability state of rock engineering and underground engineering. Construction technologies of the model often determine the feasibility of the model test and the credibility of the result to large extent. The controlling technology for 3D geomechanical model has been researched，through introducing two three-dimensional geomechanical model tests；how the bulk density grows as the depth increases in the inner model was studied by taking samples on in-situ tests with different depths，which were constructed and controlled by the fixed volumes of the materials of the models. A design and construction method is suggested；the bulk density of model material reduces as the depth increases by the so called inverse controlling method，which was carried out in another three-dimensional model test of the subway station extended from shield tunnel. The results of sampling taken from in-situ of the model test show that constructing model by this design method is available；and the density and property of the model material are uniform and stable.
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Received: 14 February 2009
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