JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2020, Vol. 37 ›› Issue (7): 109-114.DOI: 10.11988/ckyyb.20190234

• ROCKSOIL ENGINEERING • Previous Articles     Next Articles

A Method of Initializing FLAC3D Saturated-unsaturated Seepage Field

FENG Wen-kai, WU Zhuo-lin, LIN Bu-lei, ZHU Quan-wei, ZHOU Yu-long   

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
  • Received:2019-03-08 Online:2020-07-01 Published:2020-08-06

Abstract: The establishment of initial seepage field close to the real state is an important prerequisite for the correct analysis of slope rainfall infiltration. In view that methods of initializing saturated-unsaturated seepage field in FLAC3D are rarely reported, in this paper we put forward and introduce in detail the setup method of initializing saturated-unsaturated seepage field. According to the five distribution forms of matric suction, two initialization methods are proposed corresponding to the linear and non-linear distribution laws of matric suction. For the linear distribution of matric suction, MIDAS modeling and FLAC3D built-in FISH language are employed to initialize the seepage field. For non-linear distribution, since it is difficult to represent the complex geometry of groundwater level surface by using function, the groundwater level is simplified into a plane for the initial setting of seepage field by using FISH programming language. Comparison with conventional initialization method demonstrated that the initial seepage field has a great influence on the final calculation result of slope rainfall infiltration. When the initial seepage field is closer to the real state, the calculation accuracy is higher.

Key words: FLAC3D, seepage field, initialization, saturated-unsaturated, matric suction

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