天津滨海新区吹填软土结构强度形成影响因素分析

Analysis on Factors Affecting Formation of Structural Strength of Soft Dredger Fill in Tianjin Binhai New Area

吹填软土结构强度形成的影响因素很多。通过试验,从围压、偏压、排水条件以及时间效应等方面,研究了吹填软土结构强度的形成。研究结果表明:吹填软土在排水条件下,其结构强度较不排水时有明显提高;当外荷载不超过土体结构屈服应力时,施加围压的同时施加偏压,比仅施加围压时结构强度增长效果要好,且偏压越大结构强度的增长越快;在有利于结构强度形成的条件下,沉积时间的长短对吹填软土结构强度影响较大,沉积时间越长,其结构强度越大。

There are many factors affecting formation of structural strength of soft dredge fill, which is studied at the aspect of confining pressure, unsymmetrical pressure, drainage conditions and time effect by testing. The results show that the structural strength thereof is improved to a greater extent with drainage conditions than without them and, where external load is less than the structural yield stress of soil mass, the application of both confining pressure and unsymmetrical pressure can obtain greater increment of the structural strength than the application of confining pressure only, furthermore, the greater unsymmetrical pressure is applied, the greater such increment is gained; where favorable conditions of structural strength formation is available, deposition time may influence the structural strength to such an extent that the longer the deposition is lasted, the greater structural strength is obtained.