岸坡双排悬挂式钢板桩结构安全稳定性研究

Study on Safety and Stability of Suspended Double-Row Steel Sheet Pile Structure on Bank Slope

边坡开挖施工过程中,为保证岸坡的稳定性,验算支护结构的稳定性就显得尤为重要。本文依托华容煤炭铁水联运储配基地工程码头一期工程,将悬挂式双排钢板桩结构等效为重力式挡土墙,通过数学公式理论推导的方法分别从整体抗滑移稳定、整体抗倾覆稳定及基底应力等方面进行了验算,并结合计算结果对安全稳定性提出了评价。得出以下结论:该结构的抗滑移稳定性系数为1.49,大于规范要求的1.3下限;该结构的抗倾覆稳定性系数为1.63,大于规范要求的1.6下限,在结构上是安全的;该结构的基底最大压应力小于地基容许承载力,符合规范要求,但合力偏心距偏大,应及时调整防止墙身过分倾斜。

In the process of side slope excavation,it is particularly important to calculate the stability of the supporting structure,which will ensure a stable bank slope.Based on the ancillary wharf phase 1 project of Huarong coal rail-water intermodal transportation,storage and distribution base,the suspended double-row steel sheet pile structure was defined to be equivalent to a gravity retaining wall,and then the structure was calculated and derived by using mathematical formulas from the aspects of overall anti-slip stability,overall anti-overturning stability and base stress,which produced the the evaluation of structure safety and stability.The research results show the anti-slip stability coefficient at 1.49,which is greater than the lower limit at 1.3 in the specification;the anti-overturning stability coefficient at 1.63,which is greater than the lower limit at 1.6 in the specification and ensures a safe structure;the maximum compressive stress at the bottom of the structure being less than the allowable bearing capacity of the foundation,which meets the requirements in the specification.However,the eccentric distance of the resultant force shall be lowered in time to prevent the wall from tilting too much.