隧道施工期間之動態鑽炸開挖行為；與營運階段火害對噴凝襯砌與圍岩之破壞對永續工程之災防安全攸關。另於施工或營運階段，遇既存地熱或人為熱源(如輻射廢儲或瀝青灌漿)等地質狀況與其地下空間之遇火災變之防杜研析，均應對其地下結構物與岩盤等擬脆性固材之熱力驅動引致破壞之機制加以瞭解，俾於全生命週期之各工程階段提供適確之學理參佐，加強地下結構物與岩盤之永續防護，進而提升進度效率、降低人員傷亡與維護施工及營運成本。
本研究乃針對上述工程問題與兩個研究議題(地熱地質與隧道工程與火害)，以擬脆性固材(人造類岩與天然岩材)於「熱力-固力」耦合驅動破壞，分別如下三項子題簡化模擬研探之：
隧道火害之研究議題：
1. 連續式單向度熱驅破壞後之準靜態力學機制；
2. 軸對稱中空圓孔熱源之熱驅破壞演化特徵；
動態鑽炸與地熱堪虞地質之研究議題：
3. 離散式熱驅破壞後之動態力學行為。
於子題1與2整合同步化非破壞聲射訊號擷取技術(面內)與電子斑紋干涉術(面外)，同步化研析固材由內而外之破壞演化，且於子題1以微觀非破壞聲-光技術計算破裂韌度可”同步但獨立”於傳統巨觀破壞力學實驗結果作相互比對；子題3則以不同加載速率研析岩材於熱驅破壞後之拉力強度與破裂韌度之影響，且以雷射間距量測法觀察平均裂縫擴展速度。
研究結果顯示，於單向度連續熱驅破壞後之準靜態力學行為方面，巨觀觀察得到連續性之力學參數(動態彈性模數與包生比、拉力強度與破裂韌度)預測方程式，以及水泥砂漿之臨界破壞溫度約為500~600℃間，低於此臨界值者，拉力強度與破裂韌度漸次折減約14~14.5%/100℃；反之，高於此臨界值者，拉力強度與破裂韌度則約以29~37%/100℃之降幅急遽折減乃至破壞。由微觀檢測之比對亦知，常溫下試體於固力加載比(Load Level, LL)約為80%之前，微裂縫多聚集於半圓盤試體上方加載端附近，LL超過80%後，微裂縫才大量增生聚集於下方預裂縫前沿，由拉力裂縫尖端應力狀態主控其破壞裂衍，當持續加載歷程達峰後狀態，微裂縫則相互串聯演化成可視之巨觀裂縫。惟固材於高溫狀態(約大於450℃)，「熱力-固力」耦合驅動破壞特徵顯現，即加載比約在80%時，微裂縫分布只少量聚於半圓盤試體上方加載端，卻已大量增聚於預裂縫前沿尖端。此外，以非破壞聲光技術以逆運算方式求驗固材破裂韌度，可得合理一致之成果；於離散式熱驅破壞後之動態力學行為上，加載率則與動態拉力強度與破裂韌度成正相關。而其受測花崗岩固材可能之臨界破壞溫度落位於450~600℃之區間，亦即溫度於25~450℃之力學參數影響不大，但450至600℃之間，其力學參數產生了較大之變化，研判可能與花崗岩材中之礦物相變有關，此外，溫度越高，則平均裂縫擴展速度就越快。
中空圓孔熱驅破壞行為方面，本研究以熱傳理論推導線性熱驅之彈-塑性力學理論解與數值解析；再與中空圓孔熱驅破壞試驗耦合聲光非破壞同步化檢測相互比對，其數值分析之溫度與應力分布與彈性理論應力分布相似；於實驗部分，熱電偶量測固材之熱傳溫度，以及由聲學訊號空間位置觀察微裂縫「叢聚」現象與光學研析「初裂」發生，比對彈性理論解得知破壞時溫度分布和破壞之空間位置與實驗結果相近；發生叢聚時，裂縫大量聚集於正規化半徑()約為4.5~6.5之間，再由同步化光學影像得知初裂出現於約為5.0處；此外，透過理論解研析不同升溫速率與孔徑比得知，升溫速率越快或孔徑比越大時，破壞時間(tf)與量綱化半徑(f)越小，但破壞溫度會越高；由中空圓孔線性熱驅條件因子(M)得知，M越大，tf與f越小，M<5時，則破壞時機與半徑變化較大。

The early development of Taiwan transportation infrastructure was mostly located on the side of mountain region forming a circumferential turnpike and railway network. The rapid densification of this network continues. At present, National highway design considers environmental and economical impacts. To reduce damage to sensitive ecosystems brought on by construction, bridges and tunnels are considered to be the environmentally sustainable options. Previously, a lot of emphasis has been given to safety and economy of excavation of rock mass without particular attention to excavation in heated rock and to effects of tunnel fires.
However, thermo-induced damage affects the structural and material integrity of civil engineering structures; the damage can induce direct or indirect extensive structural collapse. This study aims to give engineers and tunnel designers a reference for protecting the tunnel structure and surrounding rock, increasing construction efficiency as well as decreasing casualties and cost in the project life cycle.
In this study, the complicated engineering problem was simplified into two issues; geo-thermal rock and tunnel fire studied under three topics: 1. Pseudo-static mechanics test after one-dimensional heat-driven Fracture(HdF), 2. Dynamic mechanics test after individual heat-driven damage, and 3. Heat-driven damage test with linear transient thermal loading (LTTL) on inner hollow surface (HIS) for investigating the failure mechanism.
The intended purpose of the method was to predict the effects of heat treatment on the static and dynamic mechanical properties and characteristic width of process zones, as well as the establishment of theoretical model is to predict fracture occurring time and position on the topic of HdD with LTTL on HIS. The numerical and experimental methods were used to verify the theoretical model. In addition, using the theoretical model discusses the fracture influence of increasing temperature rate and the radius ratio of outer and inner hole.
The results of the 1st topic showed that in the macroscopic, all of the results can be regressed by a continuous equation; therefore, the regression equations obtained from the results of continued heat-damaged specimen pieces represented more accurate prediction equations. Moreover, a critical damage temperature is approximately 500-600°C. For a temperature range between room temperature and approximately 500-600°C; the variation of all of the mechanical properties decreased by approximately 7.6-14.5% per 100°C, but they decreased by approximately 29-37% per 100°C between 500-600°C and the highest temperature used in the tests. On investigating the microscopic results, for specimen at room temperature, micro-cracks cluster around the top of SCB sample (near the loading position) before approximate loading level of 80%, then micro-cracks will cluster around the tip of pre-existing crack during loading level of 80% and 100%. The micro-cracks around the tip of pre-existing crack dominate the SCB fracture behavior. However, for the higher temperature specimen (approximately 450°C), before loading level of 80%, micro-cracks do not cluster at the top of Semi-circular Bend (SCB) sample, because the thermal-induced defects existed within the SCB sample, the stress field near top of SCB sample is a compressive situation, the micro-cracks will be closing, hence the acoustic emission sensors will receive new signals from the top of SCB sample during this stage. Moreover, the study attempted to calculate fracture toughness of quasi-brittle material using synchronized nondestructive techniques. Currently, only some sample results were obtained.
The results on 2nd topic showed that the dynamic mechanical parameters increase with the loading rate and decrease with the heat treatment in general. The parameters are hardly affected between room temperature and 450°C. the parameters decrease sharply between 450 and 600°C, it is probably related with the phase change of Quartz from the  to  phase, in which volume increases by 0.4% at approximately 573°C. In addition, the average velocity of crack propagation increases with the temperature.
On investigation of the results of the 3rd topic, comparison of the temperature and stresses between simulation analysis and theoretical results obtained the similar patterns; for experimental results, the temperature of heat conduction, the micro-crack localization position by AE, as well as the macro-crack initiation location from ESPI are the similar as the theoretical results. The localization position clusters between approximately nondimensional radius () of 4.5 and 6.5 using acoustical technique and the initiation location emerges at approximately  of 5. Then, using the theoretical model to understand the fracture behavior with varying increasing temperature rate (M) and the radius ratio of outer- and inner-hole (b); the f decreases and failure temperature increases with the M and b increases. To investigate the coefficient M, the f decreases with M increases, when the M<5, the failure time and the f increase.

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