本研究經由集中質量系統之動力反應方程式推導，建立一種以現有道路結構之動力特性為基準的管線及回填材料設計方法。該理論方法以既有道路結構之動力特性為標準，必需根據現有之道路結構才能進行管線及回填材料之設計。設計參數為材料彈性模數及單位重。設計條件為維持原有道路系統之基本振動頻率與振動形態。可根據不同的設計需求，如埋管深度、管徑、鋪面沉陷量、回填材料種類或施工成本等進行評估，以達到需求目標。本研究透過該理論方法，建立一種簡化評估分析程序，應用於分析管線設計施工對鋪面沉陷量造成之影響，並由材料應力-應變關係估算鋪面強度之衰減程度。經由有限元素法分析結果之比對，評估該理論方法具有足夠之計算精度，可以提供工程界快速設計及分析使用。 A novel lumped mass system of dynamic analysis procedure is presented to evaluate the pavement strength decay on buried pipeline. According to the vibration frequency of original road structure, we can design the pipeline and backfill materials in trench by choosing specific gravity and modulus of elasticity. Based on the natural frequency and mode shape of the buried pipeline system, we could calculate the accumulative settlement to evaluate the strength decay of pavement by checking stress-strain relationship. With increasing the accumulative settlement, the worser the pavement strength decays. It would be shown that the precision of lumped mass system operation is as well as to the finite element analysis results. The design procedure of lumped mass system can be satisfied with the requirement of designing for burial depth, radius of pipe, settlement, backfills and the cost evaluation of construction. It would be provided the advantage of design procedure to the road-engineering and pipeline burial construction projects in this research.
