- CSCD核心中文核心科技核心
- RCCSE(A+)公路运输高质量期刊T1
- Ei CompendexScopusWJCI
- EBSCOPж(AJ)JST
基于颗粒流原理的盾构切割GFRP筋混凝土围护桩机制
收稿日期: 2019-01-27
修回日期: 2019-06-03
网络出版日期: 2019-09-12
基金资助
北京市自然基金联合资助重点项目（KZ201810016021）
Mechanism of Shield Cutting GFRP Reinforced Concrete Pile Based on Particle Flow Principle
Received date: 2019-01-27
Revised date: 2019-06-03
Online published: 2019-09-12
在盾构无障碍接收过程中，盾构切割GFRP筋混凝土围护桩时桩体会朝向基坑临空侧发生变形，甚至发生整体倒塌，引起工程事故。为此，需要对盾构切割GFRP筋混凝土围护桩的机制进行研究。基于PFC3D建立盾构切桩的离散元颗粒流模型，得到盾构切刀切削力的变化规律与桩体应力的变化规律，揭示盾构无障碍接收切桩的机制： 前半切入行程为剪压破坏，后半切入行程为剪切破坏，并指出在切桩过程中应控制好盾构推力，避免GFRP筋混凝土围护桩整体倒塌。
关键词： 盾构接收; 颗粒流; 切割桩机制; GFRP筋混凝土围护桩
刘军 , 韩旭 , 金鑫 . 基于颗粒流原理的盾构切割GFRP筋混凝土围护桩机制[J]. 隧道建设, 2019 , 39(S1) : 32 -37 . DOI: 10.3973/j.issn.2096-4498.2019.S1.005
In the process of barrierfree shield receiving, when shield cutting GFRP reinforced concrete retaining pile, the pile body may deform towards the empty side of foundation pit, and even cause the whole collapse. Therefore, the mechanism of cutting GFRP reinforced concrete retaining pile by shield needs to be studied. Based on PFC3D, the discrete element particle flow model of shield cutting pile is established, and the variation laws of cutting force and pile stress are obtained. The shield mechanism of barrierfree receiving and pile cutting is revealed: the first half of the cutin stroke is shearcompression failure, and the second half of the cutin stroke is shear failure. The thrust of shield should be controlled well during cutting piles to avoid the overall collapse of retaining piles.
/
| 〈 |
|
〉 |