摘要
天津港南疆1号墩改造工程和北大防波堤西内堤一期围埝工程中,采用塑料排水板加固地基,成功的使用了水泥固化土模袋的施工工艺。把轴对称问题转换为平面应变问题进行分析,通过等效变换将排水板变换为连续的排水墙;同时考虑了模袋的加筋作用以及提高固化土凝聚力的作用,采用硬化模型模拟地基土体的固结过程。重点分析当地基中有排水板存在时,随上部逐级加荷,地基中心点沉降、加固区边缘的侧向变形以及中心点以下的孔隙水压力变化。分析结果与工程的实测数据吻合较好。
During constructing a dam in Tianjin Harbor, the geobag solidified soil technology was applied successfully. Because the soil strength underlying the dam was rather low, the PVC drains were adopted to accelerate the dissipation of pore water and to ensure the stability of the dam. The FEM technique with elastoplastic soil constitutive relations was used to simulate the consolidation process of foundation soil, In the analysis, the axial symmetric problem is transformed into an equivalent plane strain problem, which makes it much easier to carry out. The functions of the geotextile consisting of the geobag are considered by increasing the cohesion of the solidified soil and providing reinforcement to the structure. The load is applied step by step; the settlement and pore water pressure at the central settlement of the foundation and the lateral displacement at the edges of the foundation were calculated. The calculated results coincide well with the field investigation data.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第11期2409-2414,共6页
Rock and Soil Mechanics
关键词
模袋固化土
围埝
排水板
等效变换
准凝聚力
geobag solidified soil
dam
PVC
settlement, lateral displacement
pore water pressure
