A Stability Analysis of the Slope under Overburden using Discontinuous Deformation Analysis Method

[[abstract]]石根華博士於西元1984年在美國的第25屆岩石力學研討會(The 25th U S Symposium on Rock Mechanics)上正式發表了之新的數值分析方法-不連續變形分析法(DDA) ，方法中之元素(或稱塊體)是可分離、可變形、可移動、可轉動，塊體與塊體間是完全非連續的。林志森博士於西元1995年初步完成了DDA模擬岩體破裂 DOS版本之程式，並且在2005年至2009年間進一步發展了VB版本之視窗化程式，最近更將前處理、主程式以及後處理全部結合成單一之視窗化程式，除了將可分析塊體的數目增至5000個以達到研究所需之外，最重要的也提供了次塊體的分析功能，使得塊體內之應力分布得以獲得，因此使得DDA具有模擬岩體內部之破裂傳遞之功能。 本研究利用新發展之視窗化程式探討邊坡頂部在承受結構基礎之荷重下，對於邊坡穩定性的影響程度，首先是針對仰角的變化，接著是針對坡頂上建物基礎不同的退縮距離。初步研究成果顯示，當退縮距離達到S達到1倍之受荷重之基礎寬度時，邊坡之仰角之大小與坡頂上建物條型基礎之荷重對土體內之應力分布之影響有限。[[abstract]]The Discontinuous Deformation Analysis (DDA) method a newly developed numerical method was originally announced by Dr Shi in 1984 All the elements (or called as blocks) in the method are discontinuous and can be separated deformed displaced and rotated A program was originally developed in DOS version by Dr Chihsen T Lin in 1995 for the fracture analysis in rock mass and further modified by him for VB version from 2005 to 2009 Recently the program was combined by pre-processor and post-processor with the main program Besides the newly developed program is capable of the analysis of 5000 elements (blocks) the sub-block analysis can also be conducted to obtain the stress distribution in rock masses and therefore the fracture propagation in rock mass can be simulated This research was to study the influence the slope stability to the foundation loading on the top of the slope using the newly developed visualized program The first study was to vary the slope angles and the recessional distances of the foundation in the second study The analytical results in this research indicate that the foundation loading with a recessional distance S equal to the foundation width may not give obvious influence to the stress distribution in soil mass of the slope with various slope angles and foundation loading