以耦合數值模型探討岩坡塊體運移能量與被動式整治工程之力學反應

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題名:	以耦合數值模型探討岩坡塊體運移能量與被動式整治工程之力學反應
作者:	謝祥毓;Hsieh, Hsiang-Yu
貢獻者:	土木工程學系
關鍵詞:	數值模擬;楔形斜交坡;剛性塊體;崩落率;攔石柵;plunge angles;rockfallf energy
日期:	2026-01-29
上傳時間:	2026-03-06 18:15:55 (UTC+8)
出版者:	國立中央大學
摘要:	本研究以數值耦合模型以及能量觀點，探討逆向楔形岩坡受弱面性質影響引致破壞時，塊體運移過程與崩落撞擊攔石柵之受力情況。現地楔形岩坡常由多組弱面切割，因外在因素導致塊體運移崩落，而不同弱面參數會導致塊體崩落率與運移崩落各類能量比例不同，此外，本研究亦透過攔石柵之變形情況與應力分佈位置，討論最佳之工程整治策略。本研究以經離心模型驗證之數值模型探討楔形岩坡在不同弱面參數與重力場影響下，塊體崩落機制與能量變化之關係。由於各模型坡體體積有所差異，因此本研究亦以單位體積能量進行模型間之比較，就崩落機制而言，交線傾伏角為控制塊體崩落機制之主因，當交線傾伏角較小，塊體多以滑動的形式崩落，當交線傾伏角較大，塊體多以翻倒碰撞的形式崩落。就能量觀點而言，交線傾伏角對模型能量變化之影響較為顯著，位能會在短時間內降低。在節理間距減半的情境下，因塊體接觸頻繁，彈性接觸能佔比較多。在高重力場下，塊體總能量則明顯變大，且崩落事件多使動能在不同時間點皆有變化；塊體的破碎程度與交線傾伏角為影響塊體在攔石柵前堆積狀況之主因，同時也影響防護網之受力位置與立柱之拉壓應力分佈，在高重力場下攔石柵所受之應力明顯較大且分佈範圍也較廣。最後，本研究以台2線83K一處倒懸岩坡現地條件下進行模擬，觀察塊體運移堆積之能量變化與攔石柵所受之應力，並對其整治策略進行建議，研究結果指出，此處邊坡於極限狀況下，初始運動塊體以位能轉換為動能，但塊體開始堆積碰撞後，位能主要轉為碰撞之彈性能、摩擦能，而碰撞消耗之阻尼能則為最小。 ;In this study uses numerical modeling to investigate the impact forces acting on rockfall barriers caused by block failures from wedged rock slopes along weak planes. The analysis focuses on block barrier interactions, including block overtopping behavior and stress distribution within the barrier system, to evaluate effective mitigation strategies. In natural slopes, wedge failures are commonly induced by multiple discontinuity sets, and variations in weak plane characteristics significantly affect block release likelihood and rockfall energy. This study uses a numerical model validated by a centrifugal model to explore the relationship between the block collapse mechanism and energy change of a wedge slope under the influence of different weak planes parameters and gravity fields. In this study, energy values are normalized by volume energy density to enable comparisons among different models. Regarding the collapse mechanism, the plunge angle is the primary factor controlling the collapse mechanism. When the intersection line plunge angle is small, the blocks tend to collapse by sliding; when the plunge angle is large, the blocks tend to collapse by overturning and colliding. From the energy perspective, the plunge angle plays a crucial role in energy changes, leading to rapid loss of potential energy. Reduced joint spacing increases elastic contact energy due to frequent block collisions. The higher gravitational field significantly increases the total energy, and multiple landslide events cause kinetic energy to vary at different times. Finally, this study conducted a field simulation at the 83K section of Provincial Highway No. 2. The results show that, under extreme conditions, the potential energy of the initially moving blocks is first converted into kinetic energy. After block collisions and accumulation, potential energy is mainly converted into collision energy and frictional energy, while the damping energy dissipated during the collision is minimal.
顯示於類別:	[土木工程研究所] 博碩士論文

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