深開挖工程中側向土壓力變化

Lateral Earth Pressures during Deep Excavation

黃南輝(R. N. Hwang) ； 廖健智(Chien-Chih Liao) ； 范陳柏(Chen-Bou Fan)

《地工技術》 53期 (1996/02) Pp. 25-34

https://doi.org/10.30140/SG.199602.0003

摘要

本文根據台北捷運系統新店線CH219標中正紀念堂站於開挖施工期間，藉由擋土壁兩側之土、水壓計監測資料回饋推論深開挖過程中，當忽略土壤與擋土壁間摩擦效應時，垂直向壓力將不等於覆士壓，否則垂直向壓力於主動側將被高估、而於被動側將被低估。因此在擋土壁設計中必須考量土壤與壁面間之摩擦效應，且針對軟弱至中等堅實土壤時，可假設擋土壁與土壤間之摩擦角等於土壤的內摩擦角。

關鍵字

互制行為 ； 土水壓 ； 深開挖

並列摘要

This paper evaluates earth pressures recorded during the excavation of C.K.S Memorial Station of Hsintien Line of the Taipei Rapid Transit Systems. The main theme is on wall friction and vertical earth pressures. It can be demonstrated that the assumption normally adopted in the design of retaining structures for braced excavations that the vertical earth pressures equal to the overburden pressures could be erroneous if wall friction is considered. As a result, the vertical pressures on the active side are often over-estimated and those on the passive side under-estimated. Based on field measurements, it is appropriate for soft to medium stiff sites to assume that the angles of wall friction equal to the angles of internal friction of soils in computing the limiting active and passive earth pressures in designing retaining structures of braced excavations.

並列關鍵字

interaction ； earth pressures ； deep excavation