覆盖层上胶凝砂砾石坝应力应变特征及影响因素
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摘要
为了研究在覆盖层上的胶凝砂砾石坝的应力应变特征及影响因素,为未来在覆盖层上建造胶凝砂砾石坝做准备,使用三维有限元模拟,基于一种考虑了围压的修正邓肯—张模型模拟胶凝砂砾石料,对正常工况下的覆盖层上的胶凝砂砾石坝进行了模拟,并分别考虑了覆盖层厚度、弹性模量以及坝体胶凝材料掺量对覆盖层上胶凝砂砾石坝坝体内部的应力应变的影响。结果表明:覆盖层厚度、弹性模量以及坝体胶凝材料掺量与坝体位移呈现明显的线性关系,坝体位移随着覆盖层厚度的增加与弹性模量的降低而增大,但对坝体大、小主应力的影响不明显。即使在较软、较厚的覆盖层上,胶凝砂砾石坝仍然可以承受较大的变形而坝体内部应力变化不剧烈。该研究成果可以为胶凝砂砾石坝的选址提供一定的参考作用,可拓宽胶凝砂砾石坝的选址范围。
In order to study the stress-strain characteristics and influence factors of cemented sand and gravel(CSG) dam upon overburden for preparing the construction of CSG dam upon overburden in the days to come, the CSG dam upon overburden under normal working condition is simulated with 3-D finite element simulation on the basis of a CSG material simulated by modified Duncan-Chang model with the consideration of confining pressure; in which the influences from the thickness and elastic modulus of overburden and the cement mixing proportion of dam body on the stress-strain inside the body of CSG dam upon overburden are respectively considered. The result shows that the thickness and elastic modulus of overburden and the cement mixing proportion of dam body exhibit obvious linear relationships with the displacement of dam body, while the displacement of dam body increases along with the increase of the thickness of overburden and the decrease of the elastic modulus, but no significant influences are there on both the maximum and the minimum principal stresses of the dam body. Even if upon the softer and thicker overburden, CSG dam can still bear larger deformation without dramatical changeof the stress inside the dam body. The study result can provide a certain reference for the site selection for the construction of CSG dam and enlarge the range of the site selection as well.
In order to study the stress-strain characteristics and influence factors of cemented sand and gravel(CSG) dam upon overburden for preparing the construction of CSG dam upon overburden in the days to come, the CSG dam upon overburden under normal working condition is simulated with 3-D finite element simulation on the basis of a CSG material simulated by modified Duncan-Chang model with the consideration of confining pressure; in which the influences from the thickness and elastic modulus of overburden and the cement mixing proportion of dam body on the stress-strain inside the body of CSG dam upon overburden are respectively considered. The result shows that the thickness and elastic modulus of overburden and the cement mixing proportion of dam body exhibit obvious linear relationships with the displacement of dam body, while the displacement of dam body increases along with the increase of the thickness of overburden and the decrease of the elastic modulus, but no significant influences are there on both the maximum and the minimum principal stresses of the dam body. Even if upon the softer and thicker overburden, CSG dam can still bear larger deformation without dramatical changeof the stress inside the dam body. The study result can provide a certain reference for the site selection for the construction of CSG dam and enlarge the range of the site selection as well.
引文
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[2] 孙明权,杨世锋,田青青.胶凝砂砾石材料力学特性、耐久性及坝型综述[J].人民黄河,2016,38(7):83- 85+99.
[3] 杨会臣.胶凝砂砾石坝结构设计研究与工程应用[D].北京:中国水利水电科学研究院,2013.
[4] 张华,王学武.胶凝砂砾石坝的地质适应性试验研究[J].水电与新能源,2016(6):7- 10.
[5] 王超,胥淑美.基于材料特性的胶凝砂砾石坝地基条件适应性研究[J].水利科技与经济,2018,24(2):43- 46.
[6] 郭兴文,明宇,杨杰,等.基于新型本构模型的胶凝砂砾石坝抗震工作性态研究[J].水电能源科学,2013,31(12):90- 93+129.
[7] 蔡新,杨杰,郭兴文.一种新的胶凝砂砾石坝坝料应变预测模型[J].中南大学学报(自然科学版),2017,48(6):1594- 1599.
[8] 罗刚,张建民.邓肯-张模型和沈珠江双屈服面模型的改进[J].岩土力学,2004,25(6):887- 890.
[9] 傅华,陈生水,韩华强,等.胶凝砂砾石料静、动力三轴剪切试验研究[J].岩土工程学报,2015,37(2):357- 362.
[10] 范书立,陈健云,林皋.渗透压力对重力坝有限元分析的影响研究[J].岩土力学,2007,28(S1):575- 580.