岩溶区桩基础沉降量计算分析及注浆加固措施研究

随着我国铁路建设的蓬勃发展，新建铁路客运专线为解决沉降难题，多采取“以桥代路”的设计理念。客运专线在向全国各地区推进的同时，桥址位于岩溶区的现象也变得日趋常见。由于铁路客运专线设计时速高，因此对线路沉降量的要求也变得更高，而位于岩溶区的桥梁基础沉降如何在设计阶段进行准确的计算，在施工阶段进行严格的控制也变得尤为重要。以某铁路客运专线上位于岩溶区的某桥梁桩基础为例，分别采用规范和基于规范的计算软件对桩基础的沉降进行分析计算，分析设计采用基底加固措施的效果，根据分析计算结果进行施工方案合理优化，采取更有效、更严格的控制桥梁基础沉降的措施，为同类工程提供参考。

Numerical Analysis of the Settlement of Pile Foundation and the Study of Grouting Reinforcing Measures

With the rapid development of the railway construction in our country, in the course of building the special passengers-oriented railways, the notion of solving the problem of settlement by means of replacing the road with bridges is often adopted. As special passengers-oriented railways are being developed throughout the country, it is not uncommon that many bridges are located in karst areas. Owing to the high design speed of the special passengers-oriented railways, the requirement in the settlement of the railway lines gets even higher,as a result of which the precise calculation of the settlement of the pile foundation of a bridge in the karst areas at the design stage and the strict control of the settlement at the construction stage get especially important. With the pile foundation of a certain bridge of a certain special passengers-oriented railway in the karst area as a practical example, the settlement of the pile foundation is calculated and analyzed in the light of the technical norm and the norm-based software, and the effect of adopting the bottom-reinforcing measures in design is also analyzed in the paper, according to the analytic and calculated results of which the construction scheme is rationally optimized, with more effective and stricter settlementcontrolling measures taken for the pile foundation of the bridge. It may serve as a useful reference for other similar projects.