高强高抗渗冻结井壁混凝土配制及其试验研究
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摘要
为解决特厚冲积层井筒支护难题及冻结壁解冻后井壁渗漏水严重的问题,采用原材料优选、提高胶凝材料用量、增大砂率和降低水胶比等方法,开展正交试验得到了最优配合比。再由物理力学性能试验结果得到了冻结井壁混凝土立方体标准抗压强度与棱柱体轴心抗压强度、弹性模量之间的换算关系,以及劈裂抗拉强度、泊松比等参数,为工程应用提供了设计依据。
In order to solve problem of wellbore support in special thick alluvium,and serious problem of seepage in shaft after thawing,using raw materials optimization,improve gelled material consumption,increase the methods of sand ratio and reduce the water cement ratio,orthogonal experiment was carried out to obtain the optimal mix proportion.Based on the results of physical and mechanical properties,conversion relationship between cube compressive strength and compressive strength and elastic modulus of frozen shaft lining concrete is obtained,and splitting tensile strength,Poisson′s ratio and other parameters,which provide the basis for engineering application.
In order to solve problem of wellbore support in special thick alluvium,and serious problem of seepage in shaft after thawing,using raw materials optimization,improve gelled material consumption,increase the methods of sand ratio and reduce the water cement ratio,orthogonal experiment was carried out to obtain the optimal mix proportion.Based on the results of physical and mechanical properties,conversion relationship between cube compressive strength and compressive strength and elastic modulus of frozen shaft lining concrete is obtained,and splitting tensile strength,Poisson′s ratio and other parameters,which provide the basis for engineering application.
引文
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[3]薛维培,姚直书,宋海清,等.厚黏土层冻结法施工的煤矿井筒安全监测分析[J].中国安全科学学报,2016,26(4):137-143.
[4]姚直书,王再举,程桦.冻结壁融化期间井壁受力变形分析与壁间注浆机理[J].煤炭学报,2015,40(6):1 383-1 389.
[5]金浏.细观混凝土分析模型与方法研究[D].北京:北京工业大学,2014.
[6]王月,安明喆,余自若,等.氯盐侵蚀与冻融循环耦合作用下C50高性能混凝土的耐久性研究[J].中国铁道科学,2014,35(3):41-46.
[7]曹辉.冻结井壁高性能混凝土细观结构研究[J].煤炭技术,2015,34(9):95-97.
[8]宋灿,陈爱玖.再生粗骨料对再生混凝土基本性能的影响[J].煤炭技术,2011,30(6):159-161.
[9]徐金俊,陈宗平,余兴国,等.长龄期再生混凝土弹性模量及泊松比试验研究[J].混凝土,2012(1):15-17,23.