摘要
土工合成材料加筋土挡墙结构具备优越的力学性能,与此同时,该类支挡结构可大大降低水泥及钢筋用量,从而降低碳排放,对于“碳达峰”“碳中和”具有重要意义.相较于其他支挡结构,加筋土挡墙结构历史较短,现有设计规程中挡墙的设计以稳定校核为主,但加筋土挡墙为柔性结构,其运行期的服役性能非常关键.本文总结了本研究团队10多年来在加筋土挡墙筋材拉力分析方面的研究成果,建立了一套正常荷载作用下筋材拉力的塑性力学分析方法.该方法以加筋土潜在内部滑移面处的筋土协调变形为基础,充分考虑填土非线性应力应变关系、填土塑性变形、筋材长期刚度、主动区填土的力学平衡以及面层的力学平衡,可比较合理地估算直立及倾斜面板加筋土挡墙在运行期的筋材拉力.本文以文献中的加筋土挡墙筋材拉力实测结果和数值模拟分析的结果验证了筋材拉力塑性力学分析方法的有效性.
Geosynthetic-reinforced soil(GRS)retaining walls have exhibited good performance in extensive engineering applications.Compared with conventional earth-retaining structures,GRS retaining walls can considerably reduce the use of Portland cement and steel reinforcements,which in turn leads to a reduction in CO2 emissions.Currently,the design of GRS retaining walls primarily focuses on the strength design and consists of various stability checks.However,this type of soil structure is flexible by nature,and its serviceability design may be as important as its strength design.Because few methods are available for serviceability analyses,over the last decade,in-depth investigations into simplistic approaches have been carried out to analyze reinforcement loads under working stress conditions.The proposed approach is based on soil-reinforcement compatible deformations at the internal potential failure surface and incorporates the nonlinear stress-strain relationships between the backfill materials,their plastic deformation,the longterm stiffness of the geosynthetic reinforcement,the force equilibrium of the active soil mass,and the force equilibrium of the facing units.The proposed approach was validated against a series of measured reinforcement loads and the results from calibrated numerical analyses.It is shown that the proposed approach has the capacity to satisfactorily estimate the reinforcement loads of vertical and batter reinforced soil retaining walls with concrete block facings.
作者
刘华北
王春海
汪磊
LIU HuaBei;WANG ChunHai;WANG Lei(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Software Engineering,Jiangxi University of Science and Technology,Nanchang 330031,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2022年第7期1083-1095,共13页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:51778259)资助项目。
关键词
土工合成材料
加筋土挡墙
服役性能
筋材拉力
塑性理论
geosynthetics
reinforced soil retaining walls
serviceability
reinforcement loads
theory of plasticity
