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为解决600 m以上巨厚表土冲积层中冻结法凿井所面临的井壁结构安全性问题,根据前期井壁受力监测与分析结果,提出高强高性能钢筋混凝土复合井壁技术。设计并完成9组正交模型试验,采用横向均布油压逐级加载的方式模拟水平地压作用,研究响应条件下井壁应力特性、强度特征及破坏机理,给出井壁极限承载力经验公式和强度准则。结果表明,复合井壁结构的安全系数高,横向均布荷载作用下承载力大,混凝土强度等级每提高10 MPa,井壁承载力响应提高20.19%。同时计算表明,井壁强度准则比同类准则更精确,误差范围不超过6.5%。
In order to solve the safety of borehole structure facing freezing shaft sinking in alluvium above 600 m, according to the results of borehole wall force monitoring and analysis in the early stage, the high-strength and high-performance reinforced concrete composite borehole wall technology is proposed. 9 sets of orthogonal model tests were designed and completed. Horizontal horizontal pressure was simulated by horizontal uniform hydraulic loading step by step. The stress and strength characteristics and failure mechanism of the wellbore under the response conditions were studied. The empirical formula of wellbore ultimate bearing capacity and Strength criteria. The results show that the safety factor of composite shaft lining structure is high and the bearing capacity under transverse uniform load is large. When the strength level of concrete increases by 10 MPa, the bearing capacity of shaft lining increases by 20.19%. Simultaneous calculations show that the wellbore strength criterion is more accurate than similar criteria and the error range does not exceed 6.5%.