摘要
南方某大型生活垃圾填埋场为了扩容,需要对已有垃圾挡坝进行加高垂直扩建。由于扩容受建设场地限制,致使工程中设计为一个高陡的加筋级配碎石与黏土混合的挡坝。本文依托该具有典型意义的实际工程,首先针对渗滤液对土工布强度的潜在影响进行室内试验研究;然后通过离心机试验分析正常工况下的垃圾挡坝的稳定性;最后利用数值仿真考虑有渗滤液渗漏和无渗漏、水位变化以及土工布强度发挥程度等各种潜在工况时对陡峭垃圾填埋场稳定性进行数值仿真分析,评估其稳定性。结果分析表明,渗滤液对土工布极限抗拉强度影响较小,坝体在加筋土工布的加固作用下能使得坝体满足相关规范要求,土工布强度发挥程度以及垃圾堆体内水位变化都会对坝体的稳定性产生显著影响,其中:土工布强度发挥程度起着决定性的作用,本文计算工况表明,当土工布抗拉强度发挥程度为0时,坝体安全系数不能满足规范要求,当土工布强度发挥度在50%及以上时,坝体安全系数均能满足规范要求。
In order to increase the capacity of a large municipal waste landfill in south China,increasing the height of the dam is required.With the restricting from the existing building around the old dam,the extended part of the dam is designed as a steep gravel dam reinforced with geotextiles.Based on this special engineering,experimental tests were carried out to examine the effect of the erosion of leachate on the limiting tensional stiffness of geotextiles.The centrifuge test was carried out to examine the stability of the dam considering the special design.Subsequently numerical simulations were conducted to examine the stability analysis with considering several potential operating conditions,in which the influence of strength of geotextiles and water levels were quantified by the numerical analysis.Furthermore,the influence of the slope safety factor by varying the specific parameters of those influencing factors,were conducted.The results show that the strength of the geotextiles and the water level in the landfill have significant influence on the stability of the geotextile-reinforced earth dam.The strength of geotextiles plays a significant role for the stability of the dam,compared to that induced by the variation of water level.The calculation results show that the safety factor of the dam cannot meet the design demand when the strength of geotextile reduced to 0 percent of the design strength.However,the factor of safety of the dam can meet that requirements with at least 50%of the design strength for geotextiles.
作者
郑超
周卫东
周小文
薛娈鸾
ZHENG Chao;ZHOU Weidong;ZHOU Xiaowen;XUE Luanluan(Guangzhou Grantop Environment Service Co.,Ltd.,Guangzhou 510540,China;School of Civil and Transportation,South China University of Technology,Guangzhou 510640,China)
出处
《工程地质学报》
CSCD
北大核心
2023年第1期309-317,共9页
Journal of Engineering Geology
关键词
垃圾填埋场
碎石与黏土混合料
土工布腐蚀
稳定性
Municipal waste landfill
Gravel combined with clay
Erosion of geotextile
Slope stability
