核电站常规岛地下挡土墙土压力模型试验研究
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摘要
以广东台山核电站常规岛混凝土阶梯型挡土墙为原型,根据相似理论建立1∶10的试验模型,对比研究阶梯型直墙结构和阶梯型拱墙结构在不同边坡坡度及施工荷载组合工况下的土压力、位移和水压力分布特征。研究结果表明:(1)2种结构型式的挡土墙在各工况条件下,实测土压力均大致呈直线分布,埋深越大则其土压力值越大,且一般小于朗肯土压力理论值和静止土压力理论值。同时在施工吊装荷载作用下,在不同深度范围内会产生附加应力,大小为0.5～2.5 kPa。(2)实测位移随深度增加而减少,并可忽略施工吊装荷载的影响。在某一工况条件下,挡土墙墙顶处位移值最大。在不同工况条件下,无边坡限制条件下的位移最大,而对于有边坡限制的情况下,边坡坡度越大则位移值越小。(3)实测水压力与理论值的分布特征和大小基本一致,同样可忽略施工吊装荷载和结构型式的影响。(4)在各工况条件下,阶梯型拱墙结构挡土墙支墩和拱板处土压力均小于直墙结构挡土墙,差值为0～3 kPa,而2种型式挡土墙位移及水压力的分布特征和大小基本一致。该结论可为今后类似工程设计与施工提供一定的参考。
Taking the stepped concrete arch retaining wall of the conventional island in Guangdong Taishan Nuclear Power Station as the prototype,1∶10 experiment model is established according to the similarity theory.The distributions of earth pressure,displacement and water pressure of stepped vertical wall structure and stepped arch wall structure at different slope gradients and working conditions are comparatively studied.The results show that:(1) The earth pressure of retaining wall of the two structural forms satisfy nearly linear distribution under various work conditions.The bigger the buried-depth is,the greater the value of measured earth pressure becomes.And the earth pressure value is generally less than the theoretical values of the Rankine earth pressure and static earth pressure.At the same time,the additional stress is produced in different ranges of depth under loads,which is 0.5–2.5 kPa.(2) The measured displacement decreases as the depth increases,and is not affected by construction loads.Under certain work conditions,the displacement at the top of retaining wall reaches its maximum value.Under various work conditions,the displacement reaches the maximum value without slope limitation,otherwise,the displacement becomes less when the slope angle becomes greater.(3) The distribution and size of measured water pressure are basically identical to the theoretical ones,and the influence of construction loads can also be ignored.(4) Under various work conditions,the earth pressures at buttress and arched slab of stepped arch wall structure are less than those of stepped vertical wall structure,and the difference is 0–3 kPa.But the distribution and size of displacement and water pressure of the two structural forms are basically identical.The conclusions will have certain reference values for similar engineering design and construction in future.
Taking the stepped concrete arch retaining wall of the conventional island in Guangdong Taishan Nuclear Power Station as the prototype,1∶10 experiment model is established according to the similarity theory.The distributions of earth pressure,displacement and water pressure of stepped vertical wall structure and stepped arch wall structure at different slope gradients and working conditions are comparatively studied.The results show that:(1) The earth pressure of retaining wall of the two structural forms satisfy nearly linear distribution under various work conditions.The bigger the buried-depth is,the greater the value of measured earth pressure becomes.And the earth pressure value is generally less than the theoretical values of the Rankine earth pressure and static earth pressure.At the same time,the additional stress is produced in different ranges of depth under loads,which is 0.5–2.5 kPa.(2) The measured displacement decreases as the depth increases,and is not affected by construction loads.Under certain work conditions,the displacement at the top of retaining wall reaches its maximum value.Under various work conditions,the displacement reaches the maximum value without slope limitation,otherwise,the displacement becomes less when the slope angle becomes greater.(3) The distribution and size of measured water pressure are basically identical to the theoretical ones,and the influence of construction loads can also be ignored.(4) Under various work conditions,the earth pressures at buttress and arched slab of stepped arch wall structure are less than those of stepped vertical wall structure,and the difference is 0–3 kPa.But the distribution and size of displacement and water pressure of the two structural forms are basically identical.The conclusions will have certain reference values for similar engineering design and construction in future.
引文
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[8]应宏伟,黄东,谢新宇.考虑邻近地下室外墙侧压力影响的平动模式挡土墙主动土压力研究[J].岩石力学与工程学报,2011,30(增1):2 970–2 978.(YING Hongwei,HUANG Dong,XIE Xinyu.Study of active earth pressure on retaining wall subjected to translationmode considering lateral pressure on adjacent existing basementexterior wall[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(Supp.1):2 970–2 978.(in Chinese))
[2]周健,高冰,彭述权.不同位移模式下挡土墙的模型试验及数值模拟[J].岩石力学与工程学报,2011,30(增2):3721–3727.(ZHOU Jian,GAO Bing,PENG Shuquan.Model test and numericalsimulation of retaining wall under different displacement modes[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(Supp.2):3 721–3 727.(in Chinese))
[3]陈长冰,梁醒培,师旭超,等.挡土墙土压力公式在大型筒仓侧压力计算中的应用分析[J].岩石力学与工程学报,2007,26(2):421–426.(CHEN Changbing,LIANG Xingpei,SHI Xuchao,et al.Applicationanalysis of earth pressure computation formulae in large squat silos[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(2):421–426.(in Chinese))
[4]杨广庆.台阶式加筋土挡土墙设计方法的研究[J].岩石力学与工程学报,2004,23(4):695–698.(YANG Guangqing.Study on designmethod of tiered reinforced earth retaining wall[J].Chinese Journalof Rock Mechanics and Engineering,2004,23(4):695–698.(inChinese))
[5]文畅平,杨果林.地震作用下挡土墙位移模式的振动台试验研究[J].岩石力学与工程学报,2011,30(7):1502–1512.(WEN Changping,YANG Guolin.Large-scale shaking table tests study of seismicdisplacement mode of retaining structures under earthquake loading[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(7):1 502–1 512.(in Chinese))
[6]吴顺川,金爱兵,王金安.坡间路基挡土墙稳定性评价数值模拟及建设方案确定[J].岩石力学与工程学报,2005,24(增2):5382–5388.(WU Shunchuan,JIN Aibing,WANG Jin an.Numerical simulation ofstability assessment and design-making of a subgrade retaining wall onslope[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5 382–5 388.(in Chinese))
[7]杨广庆,蔡英,苏谦.高路堤加筋土挡土墙的变形和受力研究[J].岩石力学与工程学报,2003,22(2):321–326.(YANGGuangqing,CAI Ying,SU Qian.Testing study on deformation andstress of reinforced earth retaining wall for high embankment[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(2):321–326.(in Chinese))
[8]应宏伟,黄东,谢新宇.考虑邻近地下室外墙侧压力影响的平动模式挡土墙主动土压力研究[J].岩石力学与工程学报,2011,30(增1):2 970–2 978.(YING Hongwei,HUANG Dong,XIE Xinyu.Study of active earth pressure on retaining wall subjected to translationmode considering lateral pressure on adjacent existing basementexterior wall[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(Supp.1):2 970–2 978.(in Chinese))
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