云南炼厂岩溶地基稳定性分析
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摘要
岩溶地区地基稳定性是工程建设中关键性问题,依托中石油云南1 000万t/a炼油项目,对场地岩溶分布特征和充填物特性进行了详细分析与总结。结合场地岩溶洞隙发育规律和特征,将岩溶洞隙按跨度和顶板厚度进行分类,从中选取15个具有代表性溶洞建立天然基础和桩基础2种工况的三维有限差分模型,分析不同级别荷载作用下岩溶地基稳定性。研究结论:拟建场地岩溶发育最大特征是层状或垂直串珠状分布,该岩溶发育特征是一种持久性潜伏岩溶地质灾害,对工程建设具有较大的潜在隐患;半定量公式计算揭示场地岩溶地基对工程建设存在较大危害,其中板梁模型与其他5种方法差异较大;岩溶地基三维数值模拟结果可为工程建设提供重要依据。结论以期为类似工程地质条件地基处理提供借鉴与参考。
Stability of karst foundation is a key problem for engineering construction. Based on the karst foundation treatment of PetroChina 10 million t/a oil processing project in Yunnan Province,distributing character of the karst and feature of filling materials are analyzed and summarized in detail. Combined with development rules and character of the karst caves,the karst caves are classified according to cave span and roof thickness. Fifteen typical karst caves are chosen and three-dimensional finite difference models of those caves under two conditions of natural foundation and pile foundation are built. Stability of the karst foundation under different load conditions is analyzed. Some conclusions are drawn. Firstly,the apparent character of karst development in this proposed site is layered or vertical beaded type. The karst development under that character is one type of persistently potential geological disaster and it is also one large potential risk for engineering construction. Secondly,semi-quantitative formula method reveals that the karst foundation is dangerous to engineering construction. And calculation results of slab-beam model are different from those of other five models.Finally, three-dimensional numerical calculation results of the karst foundation can provide an important basis for this project. The experience and results could be referred in foundation treatment under similar geotechnical condition.
Stability of karst foundation is a key problem for engineering construction. Based on the karst foundation treatment of PetroChina 10 million t/a oil processing project in Yunnan Province,distributing character of the karst and feature of filling materials are analyzed and summarized in detail. Combined with development rules and character of the karst caves,the karst caves are classified according to cave span and roof thickness. Fifteen typical karst caves are chosen and three-dimensional finite difference models of those caves under two conditions of natural foundation and pile foundation are built. Stability of the karst foundation under different load conditions is analyzed. Some conclusions are drawn. Firstly,the apparent character of karst development in this proposed site is layered or vertical beaded type. The karst development under that character is one type of persistently potential geological disaster and it is also one large potential risk for engineering construction. Secondly,semi-quantitative formula method reveals that the karst foundation is dangerous to engineering construction. And calculation results of slab-beam model are different from those of other five models.Finally, three-dimensional numerical calculation results of the karst foundation can provide an important basis for this project. The experience and results could be referred in foundation treatment under similar geotechnical condition.
引文
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[2]韩红艳,吴燕舞,黑亮,等.岩溶路基溶洞顶板稳定性分析[J].工程地质学报,2012,20(6):1 078-1 082.
[3]张俊萌,方从启,朱俊峰.桩基下岩溶顶板稳定性有限元阶段分析[J].工程地质学报,2014,22(1):78-85.
[4]戴自航,范夏玲,卢才金.岩溶区高速公路路堤及溶洞顶板稳定性数值分析[J].岩土力学,2014,35(S1):382-390.
[5]尚义敏,刘会武,罗林,等.黄石冶钢变电站岩溶地基稳定性分析[J].安全与环境工程,2014,21(4):34-37.
[6]王良川.岩溶区路基下伏溶洞顶板稳定性分析及加固处理[J].矿冶工程,2015,35(5):17-21.
[7]陈洪凯,梁丹,董平.岩溶洞穴土质盖层稳定性分析方法及应用[J].地下空间与工程学报,2016,12(2):546-552.
[8]周扬,张小军,韩明.灰关联分析法在岩溶稳定性分类中的应用[J].武汉理工大学学报,2012,34(5):117-121
[9]曹文贵,李媛,翟友成.基于Info-Gap理论的基桩下伏岩溶顶板稳定性的主动分析方法[J].岩石力学与工程学报,2013,32(2):393-400.
[10]宁树理,康虔,张新兵.基于未确知测度理论的岩溶路基稳定性分析[J].山东农业大学学报(自然科学版),2016,47(1):118-123.
[11]康虔,王新民,蒲浩,等.基于变权-未确知测度理论的岩溶路基稳定性分析[J].东北大学学报(自然科学版),2016,37(3):435-439.