為充分了解土壤液化對地下維生管線之不利影響，利用大型雙軸向柔性邊界試驗箱製作實尺寸建築物地下維生管線之物理模型，以代表性實際地震紀錄做為輸入運動進行振動台試驗，實際觀察地震所激發之超額孔隙水壓、其所導致之管線上浮或沉陷、以及土壤液化引致地盤變位對掩埋於其中之管線所造成之作用。本研究針對該試驗中之建築物遠端管線，亦即連接用戶管之次要輸配幹管來進行探討，以兩端無束制之2 m長管線來近似長距離管線，並取三種不同用途與材質之管線，分別為常見之污水PVC-U管、自來水延性鑄鐵管(DIP)及天然氣HDPE管。試驗中，於管線上或周圍設置不同之量測儀器，以利充分瞭解管線於地盤內之運動行為、浮沉之位移量及超額孔隙水壓激發情形等；同時也於土體地盤內設置自由場量測儀器，藉此掌握地盤之受震液化狀態，以便與管線進行對照探討。另外，於試驗開始前與所有試驗結束後，利用透地雷達於地盤試體表面對地下管線試體施測，藉此掌握其受震前後之位置，並將探測結果與所量測之位移量相互比對。最後，採用Chian et al. (2014)建議之簡易檢核模式，對三種不同管線進行抗浮檢核，再利用管線上之水壓計實際量測值，積分估算超額孔隙水壓貢獻之上浮力，並與檢討簡易模式進行比較，檢討其可行性與適用性，以提供工程實務參考。

To investigate the influence of soil liquefaction on buried lifelines , a large biaxial shear box was used to prepare a prototype physical model of buried building lifelines, and representative actual seismic records were adopted as input motions to conduct shaking table tests. In this research, the focus was on the pipelines at the far side of buildings , namely, the distribution main pipelines that connected to the service ones. 2 m-long pipelines with both ends unconstrained were used to approximate long-distance pipelines. Three different types of pipelines were included the sewage PVC-U pipes, the potable water ductile cast iron pipes (DIP), and natural gas HDPE pipes. Different measuring instruments were installed on or arround them to observe the dynamic movement, as well as the floating or sinking of the pipelines, and also the generation of excess pore water pressure. Additionally, measuring instruments were also installed in the far field of the ground specimen to investigate the seismic response of the ground during soil liquefaction and to be compared with the pipelines. Before the beginning and after the completion of all the tests, the ground-penetrating radar (GPR) was also used to inspect the depth of the buried pipelines. Finally, the simplified method (Chian et al., 2014) was introduced for checking the anti-uplift stability on three different pipelines. The results were further compared with the uplift force estimated based on the actual measurement of the excess pore water pressure around the pipeline to examine the applicability of the simplified method for the reference of engineering practice. suggestions.

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