板缝结构对U形衬砌渠道冻胀响应的原位监测
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摘要
为探索季冻区防渗衬砌渠道混凝土板缝对冻胀变形的影响,选取宁夏引黄灌区青铜峡市沙湖村高标准农田建设项目区混凝土衬砌渠道作为试验点,在同一条渠道相近渠段上对传统多拼式U形混凝土衬砌渠道的板缝结构和经过加固处理消除板缝影响的无板缝结构进行原位监测试验,并分析处理一个完整冻融周期内两种结构的冻胀量、法向冻胀力的监测数据。结果表明:在土壤温度和土壤含水率相近情况下,消除板缝影响的无板缝U形混凝土衬砌结构冻胀量均小于传统多拼式U形混凝土衬砌结构的,且前者的法向冻胀力分布更均匀。
In order to explore the influence of concrete slabs to the frost heave deformation of concrete lining channel in seasonal frozen area, we selected the concrete lining channel in high standard farmland construction project area of Shahu Village in Qingtongxia City in Ningxia Yellow River irrigation area as a test point. In-situ monitoring test were carried out on the slab structure of traditional multi arc-plates U-shaped concrete lining channel and the slab-free structure which had been affected by the reinforcement. Finally, the frost heaving volume and the frost heaving force of the two structures in a complete freezing and thawing cycle was analyzed. The results show that in the similar circumstance of soil temperature and soil moisture content, the frost heaving volume of the U-shaped concrete lining with slab-free structure is less than that of the traditional multi arc-plates U-shaped concrete lining. And the lining with slab-free structure has a more uniform distribution of frost heaving force.
In order to explore the influence of concrete slabs to the frost heave deformation of concrete lining channel in seasonal frozen area, we selected the concrete lining channel in high standard farmland construction project area of Shahu Village in Qingtongxia City in Ningxia Yellow River irrigation area as a test point. In-situ monitoring test were carried out on the slab structure of traditional multi arc-plates U-shaped concrete lining channel and the slab-free structure which had been affected by the reinforcement. Finally, the frost heaving volume and the frost heaving force of the two structures in a complete freezing and thawing cycle was analyzed. The results show that in the similar circumstance of soil temperature and soil moisture content, the frost heaving volume of the U-shaped concrete lining with slab-free structure is less than that of the traditional multi arc-plates U-shaped concrete lining. And the lining with slab-free structure has a more uniform distribution of frost heaving force.
引文
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[11] 李文阳,潘春娟,刘洪佳.土压力盒在混凝土结构模型试验中的应用[J].山西建筑,2007,32(11):83-84.
[12] 陈继,程国栋,张喜发.分层冻胀量观测方法研究 [J]. 冰川冻土,2004,8(4):466-473.
[2] YE Min, YANFANG Hufangfu, MAO Xuesong. Freeze Depth Predicting of Permafrost Subgrade Based on Moisture and Thermal Coupling Model[J]. KSCE Journal of Civil Engineering, 2015, 19(6): 1707-1715.
[3] 银俊梅.弧底梯形的冻胀试验研究[J].中国农村水利水电,2011(12):135-138.
[4] 王正中,李甲林,陈涛,等.弧底梯形渠道混凝土衬砌冻胀破坏的力学模型研究[J]. 农业工程学报,2008,24(1):18-23.
[5] 李翠玲,王红雨.两拼式U形渠道混凝土衬砌结构冻胀破坏力学模型[J].中国农村水利水电,2004(5):86-93.
[6] 唐少容,王红雨.三板拼接式小型U形混凝土衬砌渠道冻胀破坏力学模型[J].农业工程学报,2016,32(11):159-166.
[7] 李翠玲,唐少容,王红雨.整体式U形渠道混凝土衬砌结构冻胀破坏力学模型[J].水利水电技术,2015,46(4):148-155.
[8] 李爽,王正中,高兰兰,等.考虑混凝土衬砌板与冻土接触非线性的渠道冻胀数值模拟[J].水利学报,2014,45(4):497-503.
[9] 陈振坤,施明恒.太阳辐照条件下土壤内温湿度场的动态模拟[J].太阳能学报,1998,19(1):13-19.
[10] 李子忠,郑茹梅,龚元石,等.时域反射仪对水分非均匀分布土壤含水率的测定[J].农业工程学报,2010,26(11):19-23.
[11] 李文阳,潘春娟,刘洪佳.土压力盒在混凝土结构模型试验中的应用[J].山西建筑,2007,32(11):83-84.
[12] 陈继,程国栋,张喜发.分层冻胀量观测方法研究 [J]. 冰川冻土,2004,8(4):466-473.