基于云模型的基坑工程地质条件复杂性评价研究
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摘要
针对基坑工程地质条件复杂性评价具有模糊性和随机性的问题,基于云模型理论处理地质指标的模糊性和随机性,提出一种定量指标为区间数的云模型确定方法。分析归纳福建地区的地质特点和基坑工程施工过程中可能存在风险,构建基坑工程地质条件复杂性评价体系及各指标的量化标准,将各评价等级划分为"简单"、"一般"、"较复杂"、"复杂",将其映射到区间[0,2. 5)、[2. 5,5. 0)、[5. 0,7. 5)、[7. 5,10. 0]上,并确定对应云模型的数字特征。将所提理论及方法应用于福州地铁2号线某车站基坑工程中,基于评价结果针对性地提出地下水、软土等的处理方案,工程实践验证了该评价方法的可行性和有效性。
The complexity evaluation for geological conditions of foundation pit is characterized by fuzzy and random.Hence,a method for determining the cloud model of complexity evaluation of geological conditions of foundation pit with quantitative index as interval number is established based on fuzziness and randomness of cloud model. The geological characteristics of Fujian area and possible risks during foundation pit construction are analyzed and summarized. The complexity evaluation system for geological conditions of foundation pit and quantitative standard of each index are established. The evaluation grades are divided into 4 kinds, i. e. simple, general, relatively complicated and complicated,which respectively correspond to intervals of [0,2. 5),[2. 5,5. 0),[5. 0,7. 5) and[7. 5,10. 0],and the numerical characteristics of corresponding cloud model is determined. The above-mentioned theory and method are applied to a foundation pit of Fuzhou Metro Line No. 2,the treatment measures for groundwater and soft soil are put forward based on evaluation results,and the feasibility and effectiveness of above-mentioned method are verified by engineering practice.
The complexity evaluation for geological conditions of foundation pit is characterized by fuzzy and random.Hence,a method for determining the cloud model of complexity evaluation of geological conditions of foundation pit with quantitative index as interval number is established based on fuzziness and randomness of cloud model. The geological characteristics of Fujian area and possible risks during foundation pit construction are analyzed and summarized. The complexity evaluation system for geological conditions of foundation pit and quantitative standard of each index are established. The evaluation grades are divided into 4 kinds, i. e. simple, general, relatively complicated and complicated,which respectively correspond to intervals of [0,2. 5),[2. 5,5. 0),[5. 0,7. 5) and[7. 5,10. 0],and the numerical characteristics of corresponding cloud model is determined. The above-mentioned theory and method are applied to a foundation pit of Fuzhou Metro Line No. 2,the treatment measures for groundwater and soft soil are put forward based on evaluation results,and the feasibility and effectiveness of above-mentioned method are verified by engineering practice.
引文
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[2]王法,张亚芹,王军辉,等.北京市中心城基坑工程地质条件适宜性评价方法研究[J].岩土工程学报,2012,34(增刊):739.WANG Fa,ZHANG Yaqin,WANG Junhui,et al.Suitability evaluation method for engineering geology of excavation engineering in Beijing[J].Chinese Journal of Geotechnical Engineering,2012,34(S):739.
[3]唐勇.闽江口地区地下空间开发利用适宜性评价[J].华侨大学学报(自然科学版),2015,36(5):569.TANG Yong.Suitability evaluation of underground space development in Minjiang Estuary Area[J].Journal of Huaqiao University(Natural Science),2015,36(5):569.
[4]李德毅,孟海军,史雪梅.隶属云和隶属云发生器[J].计算机研究与发展,1995(6):15.LI Deyi,MENG Haijun,SHI Xuemei.Membership clouds and membership cloud generators[J].Journal of Computer Research and Development,1995(6):15.
[5]李德毅,刘常昱.论正态云模型的普适性[J].中国工程科学,2004(8):28.LI Deyi,LIU Changyu.Study of the universality of the normal cloud model[J].Engineering Science,2004(8):28.
[6]LI Deyi,LIU Changyu,GAN Wenyan.A new cognitive model:Cloud model[J].International Journal of Intelligent Systems,2009,24(3):357.
[7]李健,汪明武,徐鹏,等.基于云模型的围岩稳定性分类[J].岩土工程学报,2014,36(1):83.LI Jian,WANG Mingwu,XU Peng,et al.Classification of stability of surrounding rock using cloud model[J].Chinese Journal of Geotechnical Engineering,2014,36(1):83.
[8]魏博文,黄海鹏,徐镇凯.基于云模型和组合赋权的岩体质量二维评价模型[J].岩石力学与工程学报,2016,35(增刊1):3092.WEI Bowen,HUANG Haipeng,XU Zhenkai.Twodimensional evaluation model of rock mass based on combination weighting and cloud model[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3092.
[9]王迎超,靖洪文,张强,等.基于正态云模型的深埋地下工程岩爆烈度分级预测研究[J].岩土力学,2015,36(4):1189.WANG Yingchao,JING Hongwen,ZHANG Qiang,et al.Anormal cloud model-based study of grading prediction of rockburst intensity in deep underground engineering[J].Rock and Soil Mechanics,2015,36(4):1189.
[10]YANG X J,YAN L L,ZENG L.How to handle uncertainties in AHP:The cloud Delphi hierarchical analysis[J].Information Sciences,2013(8):384.
[11]张方伟,姚炳学.区间数综合评判模型的改进与应用[J].系统工程与电子技术,2006(8):1185.ZHANG Fangwei,YAO Bingxue.Improvement and application of comprehensive evaluation model of intervalnumber[J].Systems Engineering and Electronics,2006(8):1185.
[12]简文彬,李润.福州轨道交通建设中的岩土工程问题[J].工程地质学报,2010,18(5):748.JIAN Wenbin,LI Run.Geotechnical engineering problems in Fuzhou rail transit construction[J].Journal of Engineering Geology,2010,18(5):748.
[13]谢季坚,刘承平.模糊数学方法及其应用[M].3版.武汉:华中科技大学出版社,2006.XIE Jijian,LIU Chengping.Fuzzy mathematics method and its application[M].3rd ed.Wuhan:Huazhong University of Science and Technology Press,2006.