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由于软土地基具有低强度、高压缩性等特征,规范规定在软土地基上建造高速公路时必须进行沉降变形监测。通过对某段路基填筑过程与预压期沉降情况分析,路基填筑期和预压期的沉降监测数据表明该段路基沉降量和沉降速率均大,且沉降速率收敛慢,这与地质资料中显示有较厚的软弱土层基本相应;在填筑期,路基快速填筑,产生沉降变形大,已经基本体现了路基后期沉降变形情况;设计方案中采用了超载预压基本合理,路基在预压期表现为沉降量大,虽然说明预压效果很好,但本段沉降速率过大,收敛速度慢,需要较长时间才能达到最终预压效果,这与地质勘察发现的淤泥质粉质黏土为中高压缩性土并不吻合,因此需要根据实际沉降观测数据进行具体分析。
Due to the characteristics of soft ground with low strength and high compressibility, the code stipulates that settlement monitoring should be carried out when constructing expressways on soft ground. Through the analysis of subgrade filling process and preloading period settlement, the subsidence monitoring data of subgrade filling period and preloading period show that the subgrade settlement and settlement rate are both large and the settlement rate converges slowly, which is in agreement with the geological data In the filling period, the subgrade quickly fill, resulting in large deformation and settlement, has basically reflected the subsidence deformation of the roadbed; design used in the basic preload overload is reasonable, roadbed in the The pre-compression period shows a large amount of sedimentation, although the preloading effect is very good, but the subsidence rate is too large, the convergence rate is slow, takes a long time to reach the final preloading effect, which is consistent with the geological survey of silty silty Clay is not consistent with medium and high compressive soils, so the specific analysis based on actual subsidence observation data is needed.