地下工程三维地质力学模型制作逆向控制技术研究与应用

 地质力学模型试验是研究岩体工程和地下工程的一种重要手段，而模型的制作方法很大程度上决定试验的可行性和结果的可靠性。以2个地下工程三维模型试验为背景，对模型制作中压实密度控制问题进行研究。根据在已建实际模型不同深度取得的实测数据，对采用等容控制夯筑法制作模型时产生的同一种材料密度不能保持恒定，而是随深度的增加产生变化的现象进行分析；提出基于击实功复合作用系数、密度随填筑深度非线性逆向控制的模型制作方法，并应用于一个实际三维模型试验模型制作中。原位取样测试结果表明，按照这种方法设计制作的模型，最终能达到模型中同一类型材料所要求的密度整体相对一致的效果，从而提高了物理模型中材料力学性质的稳定性。

STUDY AND APPLICATION OF INVERSE CONTROLLING TECHNOLOGY FOR 3D GEOMECHANICAL MODEL CONSTRUCTION OF UNDERGROUND ENGINEERING

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.