Numerical Simulation Of Complex Seepage Field Of Underground Engineering And Its Application

In the underground engineering,rock seepage can not only intenerate rock, reduce the physical mechanics parameters of rock.Further more,it is the main seepage load of the underground cavity structure,and plays a rather important effect on the stability of the underground cavity structure.In actual project, if the underground water is rich,it's very necessary to carry out seepage analyse.It is quite meaningful in project to simulate the seepage field rationally.In this paper,the method of the numerical simulation of complex seepage field of underground engineering is mainly studiedThe main content and the character of the paper lay on the following aspects:1. Abandoning Element Method for analysis of seepage with free surface is improvedElements crossing the free surface are treated as material-complexed elements.A concept named Empty Element is sugguested for dealing with Abondoned Element. The case studies show that the method is optimized.2. The simulation of faultage is actively discussed.Based on the equivalent continnum model,the character of FEM fully utilized, this paper firstly introduces the method of latent complex-material element to simulate the faultage.3. Combined with the reality of 3D FEM analyze of complicated seepage field of underground engineering,penetrability tensor is utilized to simulate the non-isotropy medium,the model of interlayer is utilized to simulate the waterproof,plane element instead of well curtain is utilized to simulate the drainage.Based on the above theory,3D FEM calculation program for seepage analyse is compiledThen this program is applied on actual projects,the surrounding rock seepage fields of several projects' underground plants are solved successfully. Based on the results,the factors which effect seepage flow area are analyzed,and the recent seepage-control schemes are analyzed.4. According to the theory of saturated-unsaturated seepage analyse,the 3D FEM program for saturated-unsaturated seepage analyse is compiledBy the program,Saturated-unsaturated seepage filed due to rain infiltration of underground engineering is numerically simulated,and it is applied on actual projects.