本研究採用三種不同性質的水泥質營建材料，分別規劃應用在地下化防護結構工程中回填覆土層、避彈設施以及主結構等施工建材，期能建立一套符合耐衝擊與抗貫穿能力之地下防護結構工程規範標準的材料組合模式，達到建構最佳防護工程之設計。研究成果可提供在地下化整體性防護工程規劃設計階段時，做為提昇投射彈體撞擊之阻抗效應參考。
本研究透過試驗方式，以土壤質控制性低強度材料、高流動性混凝土以及活性粉混凝土等三種具有優異工程特性之水泥質材料為試驗樣本。藉由材料配比設計、混合物漿體新拌性質實驗、基本力學實驗以及一系列衝擊實驗等方式進行試驗；其中衝擊試驗採用高壓氣槍發射以卵弧型鋼彈為投射彈體，彈體重14.7g，直徑12.5mm，長40.0mm，彈頭徑弧比2.5，試驗撞擊速度設定於90 m/s至150m/s之間。本研究依其材料工作度、力學行為以及靶體承受投射彈體撞擊荷載之貫入行為、破壞模式與終端彈道效應等試驗結果，分別進行分析、比較與討論。
由試驗結果顯示，三種材料在新拌階段之工作度與基本力學行為均優於傳統水泥質材料之工程性質。在一系列的衝擊試驗結果顯示，材料中添加適量的纖維含量，可大幅增加韌性性質，提昇其抗貫穿效能。故本研究將整體防護工程原有材料配置模式進行調整，回填覆土層由土壤質CLSM取代，避彈用塊石混凝土由活性粉混凝土取代，主結構混凝土採用具自充填高流動性鋼纖維混凝土取代。由上述取代材料對投射彈體的阻抗效應驗證，應可有效地提昇地下化防護結構工程耐衝擊性與抗貫穿能力之設計參數要求。

This research used three kinds of cement-based materials of various properties, designed and applied respectively as materials for the backfill overburden, projectile preventing facilities, and the main structure in overall protective engineering, all aiming to establish a material mixture model which is impact-enduring and perforation-resistant in protective construction, in order to confirm the best design of the protective structure. The result of this research can provide the military with reference indexes for the resistance effect of overall protective structure enhancement against projectile penetration in the design of underground protective construction.
By means of experiments, three cement materials with outstanding construction properties were chosen as experiment samples, namely, soil-based controlled low-strength material, self-compacting concrete, and reactive powder concrete. In this impact experiment investigation, the high pressure gas guns launched with ogive-nose steel projectiles, it weight 17.4 g, 12.5 mm diameter, 2.5 caliber-radius-head projectiles when subjected to impact velocity ranges from 90 m/s to 150 m/s. Based on the material mix design and the results of freshly mixed grout experiments, basic mechanics experiments, as well as a series of impact experiments, workability and mechanical behaviour of the materials, penetration behaviour, failure model and the terminal phenomena of projectile and target under dynamic impact loading were analysed, compared, and discussed.
Test results show that the workability in the fresh concrete phase and basic mechanical behaviour for these three materials are all better than the construction properties of traditional materials. As a series of impact experiment results show, adding the right amount of fiber into the materials can increase their toughness and enhance their perforation resistance. This research has therefore made some changes to the original material mixture model for overall protective construction. Soil-based CLSM was used as the replacement material of backfill overburden, reactive powder concrete replaced projectile preventing stone concrete, and high-fluidity steel fiber concrete with self-filling capacity was applied in the main structure.
As proven by the materials superior projectile impact resistance, these above mentioned materials can better meet the design requirements, such as impact endurance and perforation resistance prevention for overall underground protective construction.

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