铁道标准设计2017，Vol.61Issue(3)：28-32,5.DOI:10.13238/j.issn.1004-2954.2017.03.007
有改良层既有线过渡段承载特性及加固研究
Study on the Bearing Capacity and Reinforcement of an Existing Transition Section with Improved Layer
摘要
Abstract
The insufficient bearing capacity of the existing bridge transition section remains a widespread problem and Evd dynamic penetration test and adhesive strain gauge field test are employed to study the special bearing characteristics of an existing line bridge transition section with modified cement surface and underlying soft soil layer, and to evaluate the effect of cement compaction pile. Some conclusions can be drawn as the following: ( 1 ) the section of 0 ~5 m between the bridge transition section and the abutment is the weakest link and should be reinforced and protected;(2) the roadbed bearing capacity is significantly affected by the thickness of the bedding surface layer with modified cement layer, the Evd value under the rail is much larger than that of the shoulder Evd with the maximum difference up to 45. 79 MPa; ( 3 ) cement compaction pile plays an active role in improving the existing line bridge transition section subgrade bearing capability, and the stiffness values increases significantly after reinforcement, and the dynamic earth pressure decreases obviously.关键词
路桥过渡段/原位测试/水泥改良/承载特性Key words
Bridge transition section/Field test/Cement modification/Bearing capacity分类
交通工程引用本文复制引用
赵秀绍,庄锦彬,乔志帮,艾成刚..有改良层既有线过渡段承载特性及加固研究[J].铁道标准设计,2017,61(3):28-32,5.基金项目
国家自然科学基金(51208198) （51208198）
江西省岩土工程基础设施安全与控制重点实验室项目(20161BCD40010) （20161BCD40010）
