大范围堆载下的电缆工井位移风险等级划分研究
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摘要
由于邻近施工和不良地质等的影响,高压电缆通道工井经常出现沉降、倾斜和开裂等现象。采用数值模拟方法对电缆工井在大范围堆载情况下的位移和应力进行了分析,并制定了电缆工井的位移风险等级划分标准。结果表明:随着荷载增大,工井指向堆载方向的水平位移和竖向位移也随之增大,当施加荷载达到1 400 kPa时,水平位移最大值为397 mm,竖向位移最大值为307 mm;工井最大拉应力出现在井壁角点处,应力集中现象明显;当施加荷载为300 kPa时,最大拉应力达到混凝土抗拉强度,混凝土可能开裂。基于计算结果并结合风险管理等级,提出了电缆工井水平位移、竖向位移、沉降差以及倾斜角等4个可观测指标的阈值。
Due to the influence of adjacent construction and unfavorable geology,high-pressure cable channel work wells often have settlement,inclination and cracking. The numerical simulation method is used to analyze the displacement and stress of cable wells under large range loading conditions,and the displacement risk classification standard of cable wells is established. The results show that as the load increases,the horizontal displacement and vertical displacement of the work well pointing to the stacking direction also increase. When the applied load reaches 1 400 kPa,the maximum horizontal displacement is 397 mm,and the maximum vertical displacement is 307 mm;the maximum tensile stress of the well appears at the corner of the wellbore,and the stress concentration is obvious. When the applied load is 300 kPa,the maximum tensile stress reaches the tensile strength of the concrete,and the concrete may crack. Based on the calculation results and the risk management level,the thresholds of four observable indicators such as horizontal displacement,vertical displacement,settlement difference and inclination angle of cable wells are proposed.
Due to the influence of adjacent construction and unfavorable geology,high-pressure cable channel work wells often have settlement,inclination and cracking. The numerical simulation method is used to analyze the displacement and stress of cable wells under large range loading conditions,and the displacement risk classification standard of cable wells is established. The results show that as the load increases,the horizontal displacement and vertical displacement of the work well pointing to the stacking direction also increase. When the applied load reaches 1 400 kPa,the maximum horizontal displacement is 397 mm,and the maximum vertical displacement is 307 mm;the maximum tensile stress of the well appears at the corner of the wellbore,and the stress concentration is obvious. When the applied load is 300 kPa,the maximum tensile stress reaches the tensile strength of the concrete,and the concrete may crack. Based on the calculation results and the risk management level,the thresholds of four observable indicators such as horizontal displacement,vertical displacement,settlement difference and inclination angle of cable wells are proposed.
引文
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[2]郑冠雨,王汉超.地铁车站连续墙水平位移预测及风险分析[J].河南理工大学学报(自然科学版),2014,33(3):377-381.
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