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（1 北京波森特巖土工程有限公司，北京 102218；  2 滄州三環(huán)工程建設監(jiān)理公司，滄州 061001；  3 滄州筑美建筑設計有限公司，滄州 061001；  4 滄州水利勘測設計院，滄州 061000）

［摘要］對滄州某大型坑填地基的工程特點進行了分析，提出多個地基處理方案，經過技術與經濟比較，最終采用復合載體夯擴樁施工技術方案進行了加固處理，達到了預期效果。在

施工過程中，利用護筒中重錘的沖擊能，將夯實的建筑垃圾層一錘一錘地擊碎、擠向周圍，并及時將護筒跟進，有效地穿越夯實的建筑垃圾層，同時又對該層產生了進一步擠密的作用，達到對其下部實施加固處理的目的。針對場地地下承壓水對施工的影響，采取了打減壓孔、孔底封堵、局部降水等有效措施，成功地解決了場地地下承壓水的問題，確保了每根復合載體夯擴樁的施工質量。

［關鍵詞］地基處理；復合載體夯擴樁；大型坑填地基；剛性樁復合地基

Subsoil engineering properties and reinforcement of largescale pit filled in Cangzhou

Sun Yuwen 1, Duan Shusong 2, Zhao Wenge 3, Yi Haichang 4

（1 Beijing Puissant Geotechnical Engineering Co. Ltd., Beijing 102218, China; 2 Cangzhou Sanhuan Engineering Construction Supervision Company, Cangzhou 061001, China;  3 Cangzhou Zhumei Building Design Ltd. Co., Cangzhou 061001, China;

4 Cangzhou Water Conservancy Exploration & Surveying Design Institute, Cangzhou 061000, China）

Abstract:Engineering properties of large-scale pit filled in Cangzhou are analyzed, and several subsoil treatment methods are provided. Through technical and economical comparison, ram-compacted pile with bearing base was finally adopted for subsoil improvement and attained predicted effect. During construction, break and squeeze building debris around layer by layer through compact energy originating from heavy hammer with  protecting tube advancing simultaneously, going through building debris effectively and compact it at the same time, to stabilizing the underlying subsoil. Dropping pore-water pressure well, blocking up from borehole bottom, and dewatering locally methods were adopted for dealing with confined ground water successfully to ensure construction quality of ram-compacted pile with bearing base.

Keywords:subsoil treatment; composite ram pile; large-scale pit filled; composite foundation of rigid pile