ABSTRACT
When building roads on soft soil foundations, problems such as embankment instability or excessive settlement are commonly seen. Therefore, soft foundation treatment should be carried out. This paper mainly introduces the treatment of the soft soil subgrade of Wanhuan East Road in the Pearl River Delta of China. Using the plastic drainage board stacking and preloading treatment technology, through the engineering site monitoring of two sections, the surface settlement value and level of the soft soil foundation after treatment were analyzed. The variation law of displacement value and pore water pressure value was analyzed and studied. The results showed that the subsidence after the soft soil foundation treatment was obviously different. The subsidence of the road was larger than that of the shoulder of the road, and the lateral displacement mainly occurred at the elevation of −4 to −7m. When the depth was greater than 7m, it began to decrease with the increase of the depth. Due to the effect of the plastic drainage board, the soil drainage speed was accelerated, the pore water pressure dissipation speed was accelerated, and the strength of the soft soil foundation was also rapidly increased, which was conducive to the construction safety of the foundation treatment. The plastic drainage board was used to treat the soft soil foundation. Most of the settlement of the soft soil foundation was basically completed during the filling period. The post-construction settlement calculated by the layered sum method was small, and the stability coefficient met the requirements and could meet the requirements of various indicators.
