基于离散-连续耦合方法的土工格室加筋碎石承载能力数值模拟  

Numerical Simulation of the Bearing Capacity for Geocell Reinforced Gravel Based on Discrete-Continuous Coupling Calculation

作　　者：汪海年[1,2] 张然[1] 周俊[1] 刘玉[1] 尤占平[1,3] 

机构地区：[1]长安大学道路结构与材料交通行业重点实验室,陕西西安710064 [2]中交通力建设股份有限公司,陕西西安710075 [3]密歇根理工大学土木工程与环境学院,美国霍顿49931

出　　处：《郑州大学学报（工学版）》2016年第1期49-53,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：交通运输部科技资助项目(201231879210);国家科技支撑计划课题资助项目(2014BAG05B04);中央高校基本科研业务费专项资金资助项目(CHD2012ZD013)

摘　　要：土工格室加筋碎石基层材料具有较强的适应路基变形能力，然而其承栽能力与变形机理并不明确．通过采用离散-连续耦合的算法分别对格室高度为100、150、200mm；格室焊炬为400、600、800mm的9种土工格室加筋碎石基层复合结构与无格室碎石基层复合结构在加栽过程中的力学性能进行数值计算。并对土工格室结构弹性模量进行对比分析．研究结果表明：对碎石采用土工格室加筋处理后，路基承载能力得到了较大的提高，土工格室结构层弹性模量提高比例最大为38．61％；格室高度一定的情况下，土工格室结构层的承栽能力随着格室焊距的减小而增强；在格室焊距一定的情况下，土工格室结构层的承栽能力随着格室高度的增大相应提高；型号为400—200mm的土工格室结构层，竖向变形大的区域占整个下承层顶面面积的17．36％，且分布较均匀，加筋效果最好。The base material of geocell reinforced gravel has strong ability to adapt to the deformation of the subgrade, but its bearing capacity and deformation mechanism not clear. The discrete-continuous coupling calculation was used to calculate the mechanical properties of different geocell reinforced gravel composite struc- ture and the composite structure in which the geocell was not set up in the process of loading. The geocells in- clude 9 kinds whose height is 100ram, 150ram and 200mm,whose welding torch is 400 mm, 600 mm and 800 mm. Then the elasticity modulus of the bearing layer is analyzed. The results indicated that the bearing capacity of the subgrade got an obvious improvement after gravel was enforced by the geocell. Elasticity modulus of structure layer increased by 38.61%. When the height of the geocell is fixed, with the decreasing of the geo- cell welding torch, the loading capacity of geocell structural layer is increasing. When the geocell welding torch is fixed, with the increasing of the geocell height, the loading capacity of geocell structural layer is accordingly increasing. The geocell model of 400 -200ram, which big vertical displacement accounted for 17.36% of whole bearing layer area, evenly distributed, and the best reinforced.

关 键 词：道路工程 土工格室 加筋结构 承载能力 数值模拟 

分 类 号：U416[交通运输工程—道路与铁道工程]