以數值模型與離心模型試驗探討含二組正交節理之逆向坡變形及破壞行為

NCUIR > Engineering College > Graduate Institute of Civil Engineering > Electronic Thesis & Dissertation > Item 987654321/81850

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/81850

Title:	以數值模型與離心模型試驗探討含二組正交節理之逆向坡變形及破壞行為
Authors:	鄭皓文;Cheng, Hao-Wen
Contributors:	土木工程學系
Keywords:	逆向坡;傾覆破壞;PFC3D;離心模型;正交節理;岩塊傾覆破壞;Anti-dip slope;toppling failure;PFC3D;centrifuge model test;orthogonal joints;block toppling
Date:	2019-12-12
Issue Date:	2020-01-07 14:21:47 (UTC+8)
Publisher:	國立中央大學
Abstract:	台灣受到板塊擠壓的影響而形成山多平原少的地形，近年來極端氣候發生的頻率增加，岩石邊坡若受到豪雨、地震、河流沖刷等自然因素或是人為因素開發的影響，將會造成邊坡的不穩定甚至進而破壞，使附近居民或是用路人的生命財產受到威脅。胡家豪(2019)利用離心模型進行高角度逆向坡之物理試驗，並使用PFC3D來模擬更高重力場下之變形行為，考慮之變因為岩層厚度及解壓長度，研究結果指出，解壓長度愈長及岩層厚度愈薄，其岩層愈易變形，且為撓屈傾覆破壞形態。本研究則接續探討具第二組正交節理之逆向坡破壞型態，將以中央大學地工離心機進行物理試驗，並利用PFC3D進行相同試驗條件下之數值模擬，再與物理試驗進行參數校正，以此進行更高重力場下之數值模擬，用以探討第二組節理面對不同岩層厚度及解壓長度的逆向坡所造成之影響，並與不含第二組節理面逆向坡之比較。從試驗結果可得知，在有兩組相互垂直節理組的逆向坡中，岩片細長比高的岩柱仍以撓屈傾覆破壞為主，需有適當的寬度才會發生塊體傾覆破壞。 ;In recent years, the frequency of extreme climate has increased. If the rock slope is affected by natural factors such as heavy rain, earthquakes, river erosion or human activities, it will cause instability and even failure of the slope and threaten the lives and property of the people. Hu, (2019) used centrifuge tests and PFC3D to simulate the deformation behavior of the anti-dip slope under different gravity, different layer thicknesses, and release lengths. The results show that the longer release lengths and the thinner layer thickness, the more easily the layer is deformed. The failure mode will be flexural toppling. In this study, we used Centrifuge tests for physical model and PFC3D for numerical simulation to discussed the second jointed anti-dip slope failure. Then compare the two test results and perform numerical simulation under higher gravity field with the same parameters. It is used to investigates the effects of second joint set in anti-dip slopes of different layer thicknesses and release lengths under different gravity. It also discusses the difference between the deformation behavior of anti-dip slope. It can be known from the test results that the thinner layer still demonstrated the flexural toppling, and block toppling would occur with proper width.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	170	View/Open

社群 sharing

Loading...