南沙深厚软土真空预压法的现场试验与应用研究

Test In-situ and Application of Vacumn Preloading in Deep Soft-soil of Nansha

真空预压法做为一种加固软土地基的有效方法,已经被广泛用于沿海地区公路软土地基加固当中.为了研究真空预压法在深厚软土中的加固效果,通过现场试验的方法,对采用真空预压加固公路软基的一个试验段进行了分层沉降、孔隙水压力、表面沉降和水平位移的现场观测,并对观测结果进行了分析.最后,通过现场取样和室内试验的方法,对加固前后的土体抗剪强度指标等物理力学性能指标进行对比,对比发现,加固后地基土的力学性能得到较大的提高,对真空预压法在南沙深厚软土中的应用提供了设计依据.图9,表2,参6.

The vacuum preloading as an effective technology for reinforcing the soft-clay ground was used widely in coastal area. For studying the effect of ground improvement.A test in-situ was proposed on a soft ground improvement project using the method of vacuum preloading. Settlements of layers, hole water pressure, surface settlement and vertical settlement were moinored during the test. Base on the comparement of physical mechanical properts which were achieved by in-situ and in-lab test, it revealed that physical mechanical properts are improved greatly by vacumn preloading, which provide the base for road foundation design of Nansha deep soft soil.