论文部分内容阅读
通过中山造船基地真空预压软基加固工程的现场试验观测成果,从软土的微观固结机理角度定性分析了真空预压期间加固区内的出水量变化情况,以及地表沉降、地下水位与出水量之间的内在联系。研究结论如下:①真空加固期间的出水量分为两个阶段,加载初期主要为加固区内土体大、中孔隙中的自由水,恒载后以土体的中、微孔隙中能克服自身抗剪强度发生渗流的弱结合水为主。②由于自由水比弱结合水更容易发生渗流,因此抽真空初期的日出水量远大于恒载期的日出水量,但是受到场地地质条件影响,不同区域的出水量多少不均。③总出水量与地下水位降深、地表沉降的关系表现出相似的规律,即加固初期随着总出水量的增大,地下水位降深和地表沉降变化较快,后期变化较慢并逐步趋于稳定。
Through the field test and observation results of vacuum preloading and soft foundation consolidation in Zhongshan Shipbuilding Base, the change of water discharge in the reinforcement zone during vacuum preloading was qualitatively analyzed from the microscopic consolidation mechanism of soft soil, and the relationship between surface subsidence, The inner relationship between the amount of water. The conclusions are as follows: ① The amount of water discharged during vacuum reinforcement is divided into two stages. The initial loading is mainly the free water in the large and medium-sized soil in the reinforcement zone. After the dead load, the water in the soil can overcome its own Shear strength of the seepage of the weak combination of water-based. ② Since free water is more prone to percolation than weakly bound water, the amount of sunrise water in the initial stage of evacuation is much larger than the amount of sunrise water in the dead-load period. However, due to the geologic conditions of the site, the amount of water discharged in different regions is somewhat uneven. (3) The relationship between the total water discharge and groundwater table is deeper and the surface subsidence shows a similar pattern, that is to say, with the increase of the total water discharge in the initial stage of reinforcement, the groundwater table depth and surface subsidence change rapidly, the later changes slowly and gradually Stable.