近年國內外掩埋場之回填物有以固化體及一般事業廢棄物分區來置放，其回填後之力學行為是本研究之探討主題。由於固化體單元形如弱面，其回填堆置與連續體有異，故本研究採用能分析材料弱面之數值分析軟體UDEC進行應力與變形探討，依據掩埋場之規劃，就各掩埋體分層回填各階段之應力與變形行為進行分析。
本研究之掩埋場分五層回填，回填最大剖面長度(L)設定為535m，回填最大高度(H)設定為95m，將掩埋場分6個掩埋區塊並與土堤相隔，首先針對固化體與一般事業廢棄物於掩埋區交互出現之五層回填方式就應力與變形趨勢探討，在其他材料參數都相同之情況下，其次考慮掩埋區全為一般事業廢棄物之兩種情況進行分析。
分析結果顯示，掩埋場之力學行為會受回填物之堆疊方式及材料影響，在回填物交界處會有應力及變形再分配產生，另依變形分析結果可提出不同堆積厚度之沉陷預估曲線。

Domestic landfills all use municipal solid wastes and general industrial wastes as backfill substance recently, the behavior after backfilling is needed to be researched further. Because municipal solid wastes are like weak planes, their backfill stack form is different from continuous body. The research analyzes stress and deformation behavior by numerical analysis software UDEC. This research takes planning cases on landfills, to discuss stress and deformation behavior of layered backfill for all landfills.

The landfills in our research backfill by five layers. The backfill setup for length (L) is 535 meter and for highest height (H) is 95 meter. We divide landfill into six backfill zones, and each backfill zone is separated by soil dikes. At first, we analyze cases by stacking municipal solid wastes and general industrial wastes interactively in backfill zones. Next, on the assumption all other material parameters are the same, we will focus on comparison between previous samples and pure general industrial wastes instead.
The results show that behavior depends on stack form and materials for backfill substance, and stress and deformation redistribution occur on backfill substance boundaries. We could provide settlement prediction curves of different stack thickness on the basis of deformation results.

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