深厚冲积层井筒修复内层钢板高强钢纤维混凝土复合井壁研究及应用

发布时间：2018-08-11 19:07

【摘要】：针对板集煤矿副井井筒修复的复杂工程条件,提出采用内套内层钢板高强钢纤维混凝土复合井壁结构。首先,对该种新型井壁结构力学特性进行了模型试验研究,结果表明:在井壁结构中高强钢纤维混凝土的极限压应变可达(-3 710~-3 750)με,显著提高了井壁结构的延性特征;由于内层钢板的约束作用,井壁内缘钢纤维混凝土也处于三向受压状态,钢纤维混凝土抗压强度提高了1.822~1.974倍,从而显著提高了该种复合井壁的承载能力;在板集煤矿副井井筒修复工程中首次应用了内层钢板高强钢纤维混凝土复合井壁,并通过现场实测结果表明,2个监测水平钢纤维混凝土应变分别为-290με和-359με,远小于试验实测的极限压应变值,说明目前该种新型井壁结构混凝土变形小,井壁结构安全可靠。
[Abstract]:In view of the complex engineering condition of repairing auxiliary shaft in Banji Coal Mine, the composite shaft lining structure of inner casing steel plate and high strength steel fiber concrete is put forward. First of all, the mechanical properties of the new type of shaft wall structure are studied by model test. The results show that the ultimate compressive strain of high strength steel fiber reinforced concrete in the shaft lining structure can reach (-3 710 ~ 3 ~ 750) 渭蔚, which improves the ductility of the shaft lining structure. Due to the restraint of the inner steel plate, the steel fiber reinforced concrete in the inner edge of the shaft wall is also under three direction compression, and the compressive strength of the steel fiber reinforced concrete is increased by 1.822 ~ 1.974 times, thus the bearing capacity of the composite shaft lining is improved significantly. The inner steel plate high strength steel fiber reinforced concrete composite shaft lining has been used for the first time in the repairing project of auxiliary shaft in Banji Coal Mine. The results of field measurement show that the strain of two horizontal steel fiber reinforced concrete is -290 渭蔚 and -359 渭蔚 respectively, which is far less than the measured limit compressive strain, which indicates that the new type of shaft lining structure has little deformation and is safe and reliable.
【作者单位】：安徽理工大学土木建筑学院;国投新集能源股份有限公司总工程师办公室;
【基金】：国家自然科学基金面上资助项目(51674006) 国家重点研发计划资助项目(2016YFC0600902)
【分类号】：TD262.5

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