8. 有關深開挖工程對鄰產影響分析模式，本研究獲致以下結論：
(1) 利用壁體最大側向位移量估計之地表最大沉陷量其，準確 性較利用開挖深度估計為佳。
(2) 地表沉陷的型態包括三角槽型和凹槽型沉陷槽型態，其對 應之壁體側向位移之型態符合 Hsieh and Ou(1998)之研 究。
(3) 對三角槽型沉陷斷面，Peck 法、木島和阿部法及 Ou and Hsieh 法的曲線可得到不錯的沉陷分佈預測，Moh and Woo 法沉陷曲線則可得到良好的包絡線結果。
(4) 對凹槽型沉陷斷面，Clough and O'Rourke 法亦可得到不錯 的沉陷包絡結果。Ou and Hsieh 法則可得到不錯的沉陷分 佈預測。
四、主要建議事項
深開挖鄰產保護乃都市防災之重要課題，而深開挖工程對鄰產 之影響因素實為相當複雜，保護工法亦仍頗多。本研究計畫雖勉 力完成，然就工程應用層面而言，仍有諸多遺漏，值得後續之進
一步研究，此至少包含有：
1. 研究成果之定量化，例如鄰房狀況（包括建物重量、樓層數、
基礎深度等）、地層狀況（如敏感區域等）及施工狀況（如開 挖深度、工期等），對於工程應用將較為直接與實用。
2. 鄰產保護施工階段之應變計劃，動態因子掌控，監工機制及通 報體系等事宜之建立。
3. 部份保護工法成效，如地盤改良及擠壓灌漿等，受施工良窳影 響甚大，故如何找出並克服施工盲點，值得進一步探討。
另外，本研究進行期間，因淡水線及新店線已完工多年，許 多資料不復尋得，致憑添許多研究困難，故後續對於捷運工程其 他已完工之南港線、板橋線、中和線、以及即將完工之土城線等 相關研究，建議儘早進行為宜。
ABSTRACT
Keywords: Deep excavations, Building protections, Taipei rapid transit system
The objective of this research is to investigate the design and analysis for building protections in the deep excavations of the Taipei Rapid Transit System. The mechanism and effectiveness for the methods of building protection are deeply studied. Besides, an excavation case, Cathy Tien-Mu, which damaged many adjacent buildings during foundation construction, is also studied to investigate the causes of building damages.
Four building protection methods for the building protection during excavation, cross wall, compaction grouting, micro pile and preload, were used in the Hsien-Tien and Tan-sui lines. The effectiveness of the various building protection methods are evaluated through the criterion established by TRTS as well as monitoring data. Results show that cross wall methods, applied two train stations, and compaction grouting methods, used in three train stations, exhibited little improvement in reducing ground settlement.
Micro piles, only applied in the exit B of the Wan-Lung station, seems to have the function to reduce the settlement. 50% of the preloading on the struts, required by the specification of the TRTS bureau, applied to every TRTS station. However, the settlement at the northern part of the station where the site is mainly consisted of the Sungshan formation was commonly larger than that required by the specification. The settlement at the southern part of the station where the site was consisted of the Chinmei formation is smaller than that required by the specification. Finally, the various analysis methods for ground settlement are evaluated. With the case history of building damage induced by the Cathy Tien-Mu excavation, it is inferred that the building
settlement was mainly induced by the lowering the piezometric level of the aquifer layer, which caused the above clayey soil consolidated.