软土地基桥头处理稳定性分析与应用

Stability Analysis and Application of Bridgehead Treatment in Soft Soil Foundation

泡沫轻质土、土工格栅在软土路基中的应用是一项重要的技术革新,对于提高边坡稳定系数、降低工后沉降、节约用地资源、保护生态环境意义重大。以洞头县某桥梁桥头软基处理为研究对象,采用正版理正岩土计算软件6.5PB3版进行边坡稳定计算,并选择极限抗拉强度为90kN/m的单项HDPE土工格栅作为加筋材料,对填方边坡进行加筋计算。根据设计方案计算边坡最小安全系数,通过比选最终确定路基边坡方案。在复杂地形条件下,可以采用土工格栅加筋与泡沫轻质土材料的选取来改善填方路基的稳定性,同时通过合理的调整筋材提高填方路基边坡稳定性。

The application of foam light soil and geogrid in the soft soil foundation is an important technical improvement, and is of great significance to improve the slope stability coefficient, reduce the post-construction settlement, save the land resource and protect the ecological environment. Taking the soft foundation treatment of a bridgehead in Tongtou County as the study object, this paper calculates the slope stability by the legal copy of Lizheng geotechnical calculation software 6.5PB3, and selects the single HDPE geogird with the ultimate tensile strength of 90 kN/m as the reinforcement material to carry out the reinforcement calculation of fill slope. Based on the design scheme, the minimum safety coefficient of slope is calculated. The slope scheme of the foundation is finally determined after the comparison and selection. The use of geogrid reinforcement and the selection of foam light soil material can improve the stability of fill foundation under the complex topographic condition. At the same time, the reasonable adjustment of reinforcement material can improve the stability of fill foundation slope.