摘要
为了研究改建后的大型渠道在首次加荷过程中产生的沉降位移量是否会对灌溉设计产生较大影响,笔者基于大型梯形渠道弧形底混凝土防渗渠加荷与卸荷过程中变形观测原位试验,分析了改建后的大型渠道在首次加荷与卸荷过程中渠床的变形特性。结果表明:改建后的大型渠道在首次加荷与卸荷过程中,会发生一个较大的弹性变形及塑性变形,渠道在垂向上的沉降量与回弹量的大小随外荷载不断变化具有一定特征;改建后的大型渠道在首次加荷过程中产生的沉降位移量与渠底以下非饱和土壤的厚度有较大关系;由于渠道在首次加荷与卸荷过程中在垂向上有较大的沉降量,则为满足灌溉条件,应在渠道的设计与施工中采取一定的必要措施。
In order to reconstruction of large observation situ test of unloading study if the settlement and displacement created by the first loading process of the channel will have great effect to irrigation requirements, based on the deformation large trapezoidal channels arc bottom concrete seepage-proofing channel loading and process, the author analyzed the deformation characteristics of the reconstruction large channel bed after the process of loading and unloading for the first time. The results showed that： in the process of loading and unloading for the first time of reconstruction large channel, would happen to a large elastic deformation and plastic deformation, the channel settlement and spring back amount in the vertical had certain characteristics with the external load changing; The subsidence displacement of the large reconstructed channel which created by the first loading process had larger relationship with the unsaturation soil thickness which below channel bottom; due to the channel in the process of loading and unloading for the first time had a larger settlement in vertical, to satisfy the irrigation conditions, should take some necessary measures in the channel design and construction.
出处
《中国农学通报》
CSCD
2014年第11期145-149,共5页
Chinese Agricultural Science Bulletin
基金
水利部大
中型灌区续建配套项目"大型梯形渠道弧形底混凝土防渗结构抗冻性能研究"(20081015)
关键词
大型渠道
弹性变形
塑性变形
设计水位
large channels
elastic deformation
plastic deformation
design level
