以顶面回弹模量为目标的铁路货场地基换填方法研究  

Study on the method for ground replacement in railway freight yard aiming at resilient modulus of top surface

作　　者：田野 TIAN Ye(China Railway 19th Bureau Group Guangzhou Engineering Co.,Ltd.,Guangzhou 511466,China)

机构地区：[1]中铁十九局集团广州工程有限公司,广东广州511466

出　　处：《长沙理工大学学报（自然科学版）》2023年第1期58-64,共7页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金项目(51108049);中国国家铁路集团有限公司科技研究开发计划课题(K2020G036)。

摘　　要：【目的】提升软弱地基刚度,科学确定处置材料和厚度。【方法】依托广西百色东站货场堆场地基处置项目,基于弹性半空间和弹性双层体系理论,提出以顶面当量回弹模量为目标的刚度提升方法,对依托工程原地基处置方案进行评价和优化,并利用现场回弹模量测试结果验证刚度提升方法的有效性和合理性,同时对比优化方案和原方案的工程经济性。【结果】原地基处置方案地基顶面回弹模量无法满足设计要求,将原方案1.0 m厚的石灰掺量为30%的石灰改良土变更为0.8 m厚,并在其上部加铺0.2 m厚的级配碎石,可使地基顶面当量回弹模量由44.0 MPa提升至78.0 MPa,实测地基顶面回弹模量平均值约为79.0 MPa,优化方案在降低工程造价方面具有显著优势。【结论】研究成果可为地基处置和铺面结构设计提供参考。[Purposes]This work aims to improve the stiffness of soft ground and determine the materials and thickness for treatment scientifically.[Methods]Based on the ground treatment project of the freight yard of Baise East Railway Station in Guangxi,a stiffness enhancement method aiming at the equivalent resilient modulus at the top surface was proposed based on the theory of elastic half-space and elastic double-layer system.The stiffness enhancement method evaluated and optimized the original foundation treatment scheme,whose validity and rationality was verified by the in-situ test results of resilient modulus.Subsequently,the economic efficiency of the optimized and the original scheme was compared and analyzed.[Findings]The results showed that the resilient modulus at the top surface of the foundation in the original scheme could not meet the design requirements.Changing the thickness of 1.0 m lime-improved soil(lime content 30%)to 0.8 m and laying 0.2 m thick graded crushed stone above,the equivalent resilient modulus at the top surface of the foundation can increase from 44.0 MPa to 78.0 MPa.The average value of resilient modulus measured on the top surface of the foundation was about 79.0 MPa.The optimized scheme has significant advantages in terms of reducing engineering costs.[Conclusions]This study can provide foundation treatment and pavement structure design references.

关 键 词：软弱地基 回弹模量 刚度提升 设计理论 地基换填 

分 类 号：TU47[建筑科学—结构工程]