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贵州省六盘水至威宁高速公路弃土场稳定性评估
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引用本文:沈明祥,罗红明,刘志鹏,穆日盛,彭坤杰.贵州省六盘水至威宁高速公路弃土场稳定性评估[J].中国岩溶,2019,(4):559-564. SHEN Mingxiang,LUO Hongming,LIU Zhipeng,MU Risheng,PENG Kunjie.Stability assessment of the spoil ground on the Liupanshui-Weining expressway in Guizhou Province[J].Carsologica Sinica,2019,(4):559-564.
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作者单位
沈明祥 中交二公局第六工程有限公司西安 710075 
罗红明 中国科学院武汉岩土力学研究所/岩土力学与工程国家重点实验室,武汉 430071 
刘志鹏 中交第二公路勘察设计研究院有限公司武汉 430056 
穆日盛 中交二公局第六工程有限公司西安 710075 
彭坤杰 中交第二公路勘察设计研究院有限公司武汉 430056 
基金项目:国家自然科学基金项目(41402318)
中文摘要:以贵州省六盘水至威宁高速公路K89+250右侧140 m弃土场为研究对象,通过现场调查和计算分析对弃土场的排水能力、拦渣墙和边坡的稳定性进行了复核和验算,综合评估了弃土场的稳定性。结果表明:弃土场的洪峰流量为0.874 m3· s-1,小于截排水沟的最大泄水能力1.95 m3· s-1;弃土边坡在正常运用条件下的局部稳定性系数为1.404,整体稳定性系数为1.360,在非常运用工况条件下局部稳定性系数为1.303,整体稳定性系数为1.172;拦渣墙的抗滑稳定性大于1.3、抗倾覆稳定性大于1.5,基底应力小于地基承载力250 kPa。因此,弃土场的截排水沟尺寸能够满足弃土场排水要求,不同工况条件下弃土场边坡是稳定的,拦渣墙的抗滑移、抗倾覆及地基承载力均能满足稳定安全要求,建议对覆土边坡进行植草绿化,完善弃土场截排水,以减小坡面水土流失。
中文关键词:高速公路  弃土场  排水系统  拦渣墙  稳定性评估
 
Stability assessment of the spoil ground on the Liupanshui-Weining expressway in Guizhou Province
Abstract:Taking the 140m spoil ground on the right side of K89+250 from Liupanshui to Weining expressway in Guizhou Province as research object, the drainage capacity, the stability of retaining wall and slope are evaluated by site investigation and calculation and the stability of the spoil ground is evaluated. The results show that the peak discharge of the spoil ground is 0.874 m3· s-1, which is less than the maximum discharge capacity of 1.95 m3· s-1of the drainage ditch. The local stability coefficient of the spoil ground slope is 1.404 and the overall stability coefficient is 1.360 under normal operating conditions. The local stability coefficient is 1.303 and the overall stability coefficient is 1.172 under abnormal operating conditions. Anti-sliding stability of the retaining wall is greater than 1.3, anti-overturning stability is greater than 1.5, and the base stress is less than 250 kPa of foundation bearing capacity. Consequently, dimensions of drainage ditches can meet the drainage requirements of the spoil ground. The overall and local stability of the spoil ground slope under different working conditions can meet the requirements of stability and safety, and the anti-sliding stability, anti-overturning stability and bearing capacity of retaining wall also can meet the requirements of stability and safety. It is recommended to plant grass on the slope to improve the interception and drainage of the spoil ground and reduce the soil erosion on the slope.
keywords:expressway, spoil ground, drainage system, retaining wall, stability assessment
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