软土地基大型复杂基坑工程设计及施工.pdf

TU473.2 A 2006)S0162805 (1964 ) Design and construction of large scale and complex foundation pits under soft foundation conditions QIN Xia-qiang (Xi’an University of Architecture Technology, Xi’an 710055, China) Abstract: Due to the mucky soil’s high natural moisture content, large compressibility, low strength and other areal discrepancies, the risk of foundation excavation is high. The choice of its retaining method affects obviously the cost, schedule and quality of the project, and even may be the key to the successful achievement of the project’s objective. Through the analysis of the characteristics of littoral mucky soils, the common retaining and protection systems of foundation excavation in China were comprehensively compared and analyzed in combination with the engineering practices, and the engineering and construction principle of “adjusting measures to local conditions” was expounded for the retaining and protection of foundation excavation. Key words: soft foundation; retaining and protection of foundation excavation; engineering; construction Table 1 Some characteristic indexes of mucky soils % /(kN ·m3) e /% 58~79 15.5~16.5 1.66~ 5~10 0.88~ 2.05 1.23 39~47 17.1~18.1 1.07~ 5~10 0.65~ 1.31 0.97