软土地区护塘河开挖稳定性分析及支护方案研究

Stability Analysis and Support Scheme Study for Hutang River Excavation in Soft Soil Areas

摘要:

针对浙南软土地段护塘河开挖时出现的淤泥隆起，规划路周边地块沉陷问题，对规划路与护塘河的路堤合一结构进行稳定性分析和支护方案研究。综合考虑地质条件、技术可行性、施工进度等因素，提出了钻孔灌注桩与水泥搅拌桩联合支护方案，并通过FLAC^3D建立三维支护加固方案的数值计算模型，分析了护塘河基坑开挖过程中的位移变化规律。结果表明：钻孔灌注桩与水泥搅拌桩的联合支护方案可在深厚软基路段起到良好的支护作用，保证护塘河开挖基坑和周边规划路的稳定性，对类似软土地质条件下护塘河开挖工程具有借鉴意义。

Abstract:

Aiming at the issues of silt uplift and subsidence in surrounding planned road areas during the excavation of Hutang River in a soft soil region of South Zhejiang, the stability analysis and support scheme research on the integrated structure of the planned road and the embankment of the Hutang River are conducted. By comprehensively considering the geological conditions, technical feasibility, construction progress and the other factors, a combined supporting scheme of bored cast-in-place piles and cement mixing piles is proposed. The numerical calculation model of 3D supporting reinforcement scheme is established through FLAC^3D to analyze the displacement variation rule during the excavation of foundation pit of Hutang River. The result shows that the combined supporting scheme of bored cast-in-place piles and cement mixing piles can play the good supporting role in the deep and thick soft foundation road sections, which ensures the stability of the foundation pit for the excavation of the Hutang River and the surrounding planned roads, and is of reference significance for the excavation project of such rivers under similar soft soil conditions.