滇池湖相泥炭土固结系数及次固结系数研究
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摘要
泥炭土通常被判定为高压缩性土,其主、次固结作用对该类地基上的建筑物沉降有着重要的影响。针对昆明滇池地区湖相泥炭土,通过一系列高压固结试验,开展了泥炭土主、次固结系数的研究。结果表明:滇池湖相泥炭土的固结系数C_v随着固结压力p的增加呈现逐渐减小的趋势,C_v与lgp具有幂函数关系,且随着压力的增加C_v-lgp曲线可分为快速减小、缓慢减小和趋于稳定3个阶段。次固结系数C_a随着固结压力的增大呈现先增大后减小、再次增大而后再次减小最后逐渐衰减稳定的规律,C_a与压力对数lgp符合三阶高斯函数关系。根据试验和分析结果,对滇池湖相泥炭土的固结机理进行了探讨,认为土体结构的破坏、重组、压实再造及结合水膜、矿物质变化、重结晶作用等过程导致了土体呈现出复杂而又规律变化的固结特性。
Peat soil is generally deemed as high compressible soil. The consolidation and secondary consolidation influences greatly on the building settlement. According to a series of high pressure consolidation tests of lacustrine peat soil in the Dian Lake area, the coefficients of consolidation and secondary consolidation are analyzed and studied. The results show that the coefficient of consolidation C_v declines gradually with the consolidation pressure p increases, and the C_v-lgp curve conforms to power function relationship, which can be divided into three stages, i.e. rapid decline, slow decline and stable stage. The secondary consolidation coefficient C_a increases and then decreases, then increases again and then decreases again, and then gradually decays and stabilizes with the increase of consolidation pressure, and the C_a-lgp curve conforms to third order Gaussian function relationship. Based on the test and analysis result, consolidation mechanism of lacustrine peat soil in the Dian Lake area is discussed. The damage, recombination, compaction and reconstruction of soil structure as well as the changes of bound water film, minerals and recrystallization will result in the complicated and regular consolidation of the soil.
Peat soil is generally deemed as high compressible soil. The consolidation and secondary consolidation influences greatly on the building settlement. According to a series of high pressure consolidation tests of lacustrine peat soil in the Dian Lake area, the coefficients of consolidation and secondary consolidation are analyzed and studied. The results show that the coefficient of consolidation C_v declines gradually with the consolidation pressure p increases, and the C_v-lgp curve conforms to power function relationship, which can be divided into three stages, i.e. rapid decline, slow decline and stable stage. The secondary consolidation coefficient C_a increases and then decreases, then increases again and then decreases again, and then gradually decays and stabilizes with the increase of consolidation pressure, and the C_a-lgp curve conforms to third order Gaussian function relationship. Based on the test and analysis result, consolidation mechanism of lacustrine peat soil in the Dian Lake area is discussed. The damage, recombination, compaction and reconstruction of soil structure as well as the changes of bound water film, minerals and recrystallization will result in the complicated and regular consolidation of the soil.
引文
[1] MacFarlan I.C.The Muskeg Subcommittee.Proc.,Tenth Muskeg Research Conf.,National Research Council of Canada[C].Ottawa:Assoc.Ctee.on Soil and Snow Mech.,Tech.Memo,1965,85:1～5.
[2] 孙晓娟.滇池泥炭土工程地质特性试验研究[D].昆明:昆明理工大学硕士学位论文,2006.Sun Xiaojuan.Experimental study on engineering geological property of lacustrine peat soil around the Dian Lake[D].Kunming:Kunming University of Science and Technology,2006.(in Chinese)
[3] 谭儒蛟,焦宇杰,徐文杰.天津滨海软土固结—蠕变特性及微观结构分析[J]工程勘察,2015,43(5):14～17.Tan Rujiao,Jiao Yujie,Xu Wenjie.Study on the consolidation-creep characteristics and microstructure of the soft soil in Tianjin Binhai Area[J].Geotechnical Investigation & Surveying,2015,43(5):14～17.(in Chinese)
[4] 吴雪婷.温州浅滩淤泥固结系数与固结应力关系研究[J].岩土力学,2013,34(6):1675～1679.Wu Xueting.Research on relation between consolidation coefficient and consolidation stress of silt in Wenzhou shoal[J].Rock and Soil Mechanics,2013,34(6):1675～1679.(in Chinese)
[5] 马驯.固结系数与固结压力关系的统计分析及研究[J].港口工程,1993(1):46～53.Ma Xun.Statistical analysis of the relationship between consolidation coefficient and consolidation pressure[J].Port Engineering,1993(1):46～53.(in Chinese)
[6] 林鹏,许镇鸿,徐鹏等.软土压缩过程中固结系数的研究[J].岩土力学,2003,24(1):106～112.Lin Peng,Xu Zhenhong,Xu Peng et al.Research on coefficient of consolidation of soft clay under compression[J].Rock and Soil Mechanics,2003,24(1):106～112.(in Chinese)
[7] Mesri G,Ajlouni M.Engineering properties of fibrous peats[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(7):850～866.
[8] 邵光辉,刘松玉.海相结构软土的次固结研究[J].岩土力学,2008,29(8):2057～2062.Shao Guanghui,Liu Songyu.Research on secondary consolidation of structural marine clays [J].Rock and Soil Mechanics,2008,29(8):2057～2062.(in Chinese)
[9] 李硕,王常明,吴谦等.上海淤泥质黏土固结蠕变过程中结合水与微结构的变化[J].岩土力学,2017,38(10):2809～2816.Li Shuo,Wang Changming,Wu Qian et al.Variations of bound water and microstructure in consolidation-creep process of Shanghai mucky clay[J].Rock and Soil Mechanics,2017,38(10):2809～2816.(in Chinese)
[10] 胡建平,郑建朝.浙江近海软黏土次固结系数研究及应用[J].地下空间与工程学报,2016,16(4):1082～1088.Hu Jianping,Zheng Jianchao.Research and application of secondary consolidation coefficient of Zhejiang coastal soft clay[J].Chinese Journal of Underground Space and Engineering,2016,16(4):1082～1088.(in Chinese)
[11] 范建好,张延军,李录娟.三亚海相软土次固结特性研究[J].工程勘察,2010,38(10):1～4.Fan Jianhao,Zhang Yanjun,Li Lujuan.Study on secondary consolidation properties of marine soft soils in Sanya[J].Geotechnical Investigation & Surveying,2010,38(10):1～4.(in Chinese)
[12] Adams,J.I.The engineering behavior of a Canadian muskeg[A].Proc.6th Int.Conf.Soil Mech.Found.Eng.[C],1965,1,3～7.
[13] Laval Samson,Pierre La Rochelle.Design and performance of an expressway constructed over peat by preloading[J].Canada Geotechnical Journal,1972,9(4):447～466.
[14] 刘侃,杨敏.泥炭土的概念模型和一维固结理论分析[J].水利学报,2015,46(S1):225～230.Liu Kan,Yang Min.A conceptual model and one-dimensional consolidation theory for peat[J].Journal of Hydraulic Engineering,2015,46(S1):225～230.(in Chinese)
[15] 方坤斌,李卫超,杨敏.有机质相压缩变形对泥炭土固结特性影响[J].岩土工程学报,2017,39(S2):194～197.Fang Kunbin,Li Weichao,Yang Min.Effect of compression of organic matter on consolidation behavior of peaty soil[J].Chinese Journal of Geotechnical Engineering,2017,39(S2):194～197.(in Chinese)
[16] 吕岩,佴磊,徐燕等.有机质对草炭土物理力学性质影响的机理分析[J].岩土工程学报,2011,33(4):655～660.Lü Yan,Nie Lei,Xu Yan et al.The mechanism of organic matter effect on physical and mechanical properties of turfy soil[J].Chinese Journal of Geotechnical Engineering,2011,33(4):655～660.(in Chinese)
[17] 桂跃,余志华,刘海明等.高原湖相泥炭土固结系数变化规律试验研究[J].岩石力学与工程学报,2016,35(S1):3259～3267.Gui Yue,Yu Zhihua,Liu Haiming et al.Experimental study of the change law of consolidation coefficient of the plateau lacustrine peaty soil[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3259～3267.(in Chinese)
[18] 桂跃,余志华,刘海明等.高原湖相泥炭土次固结特性及机理分析[J].岩土工程学报,2015,37(8):1390～1398.Gui Yue,Yu Zhihua,Liu Haiming et al.Secondary consolidation properties and mechanism of plateau lacustrine peaty soil[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1390～1398.(in Chinese)
[19] Ajlouni MA.Geotechnical properties of peat and related engineering problems[D].University of Illinois at Urbana-Champaign,2000.
[20] Lea N,Brawner Co.Highway design and construction over peat deposits in the lower British Colombia[J].Highw.Res.Rec.,1963,7:1～32.
[21] Dhowian,A.w.and Edil,T.B..Consolidation behavior of peats[J].Geotechnical Testing Journal.GTJODJ,1980,3(3):105～114.
[22] Weber,W.G..Performance of embankments constructed over peat[J].J.Soil Mech.Found.Div.,ASCE,1969,95,(S1):53～76.
[2] 孙晓娟.滇池泥炭土工程地质特性试验研究[D].昆明:昆明理工大学硕士学位论文,2006.Sun Xiaojuan.Experimental study on engineering geological property of lacustrine peat soil around the Dian Lake[D].Kunming:Kunming University of Science and Technology,2006.(in Chinese)
[3] 谭儒蛟,焦宇杰,徐文杰.天津滨海软土固结—蠕变特性及微观结构分析[J]工程勘察,2015,43(5):14～17.Tan Rujiao,Jiao Yujie,Xu Wenjie.Study on the consolidation-creep characteristics and microstructure of the soft soil in Tianjin Binhai Area[J].Geotechnical Investigation & Surveying,2015,43(5):14～17.(in Chinese)
[4] 吴雪婷.温州浅滩淤泥固结系数与固结应力关系研究[J].岩土力学,2013,34(6):1675～1679.Wu Xueting.Research on relation between consolidation coefficient and consolidation stress of silt in Wenzhou shoal[J].Rock and Soil Mechanics,2013,34(6):1675～1679.(in Chinese)
[5] 马驯.固结系数与固结压力关系的统计分析及研究[J].港口工程,1993(1):46～53.Ma Xun.Statistical analysis of the relationship between consolidation coefficient and consolidation pressure[J].Port Engineering,1993(1):46～53.(in Chinese)
[6] 林鹏,许镇鸿,徐鹏等.软土压缩过程中固结系数的研究[J].岩土力学,2003,24(1):106～112.Lin Peng,Xu Zhenhong,Xu Peng et al.Research on coefficient of consolidation of soft clay under compression[J].Rock and Soil Mechanics,2003,24(1):106～112.(in Chinese)
[7] Mesri G,Ajlouni M.Engineering properties of fibrous peats[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(7):850～866.
[8] 邵光辉,刘松玉.海相结构软土的次固结研究[J].岩土力学,2008,29(8):2057～2062.Shao Guanghui,Liu Songyu.Research on secondary consolidation of structural marine clays [J].Rock and Soil Mechanics,2008,29(8):2057～2062.(in Chinese)
[9] 李硕,王常明,吴谦等.上海淤泥质黏土固结蠕变过程中结合水与微结构的变化[J].岩土力学,2017,38(10):2809～2816.Li Shuo,Wang Changming,Wu Qian et al.Variations of bound water and microstructure in consolidation-creep process of Shanghai mucky clay[J].Rock and Soil Mechanics,2017,38(10):2809～2816.(in Chinese)
[10] 胡建平,郑建朝.浙江近海软黏土次固结系数研究及应用[J].地下空间与工程学报,2016,16(4):1082～1088.Hu Jianping,Zheng Jianchao.Research and application of secondary consolidation coefficient of Zhejiang coastal soft clay[J].Chinese Journal of Underground Space and Engineering,2016,16(4):1082～1088.(in Chinese)
[11] 范建好,张延军,李录娟.三亚海相软土次固结特性研究[J].工程勘察,2010,38(10):1～4.Fan Jianhao,Zhang Yanjun,Li Lujuan.Study on secondary consolidation properties of marine soft soils in Sanya[J].Geotechnical Investigation & Surveying,2010,38(10):1～4.(in Chinese)
[12] Adams,J.I.The engineering behavior of a Canadian muskeg[A].Proc.6th Int.Conf.Soil Mech.Found.Eng.[C],1965,1,3～7.
[13] Laval Samson,Pierre La Rochelle.Design and performance of an expressway constructed over peat by preloading[J].Canada Geotechnical Journal,1972,9(4):447～466.
[14] 刘侃,杨敏.泥炭土的概念模型和一维固结理论分析[J].水利学报,2015,46(S1):225～230.Liu Kan,Yang Min.A conceptual model and one-dimensional consolidation theory for peat[J].Journal of Hydraulic Engineering,2015,46(S1):225～230.(in Chinese)
[15] 方坤斌,李卫超,杨敏.有机质相压缩变形对泥炭土固结特性影响[J].岩土工程学报,2017,39(S2):194～197.Fang Kunbin,Li Weichao,Yang Min.Effect of compression of organic matter on consolidation behavior of peaty soil[J].Chinese Journal of Geotechnical Engineering,2017,39(S2):194～197.(in Chinese)
[16] 吕岩,佴磊,徐燕等.有机质对草炭土物理力学性质影响的机理分析[J].岩土工程学报,2011,33(4):655～660.Lü Yan,Nie Lei,Xu Yan et al.The mechanism of organic matter effect on physical and mechanical properties of turfy soil[J].Chinese Journal of Geotechnical Engineering,2011,33(4):655～660.(in Chinese)
[17] 桂跃,余志华,刘海明等.高原湖相泥炭土固结系数变化规律试验研究[J].岩石力学与工程学报,2016,35(S1):3259～3267.Gui Yue,Yu Zhihua,Liu Haiming et al.Experimental study of the change law of consolidation coefficient of the plateau lacustrine peaty soil[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3259～3267.(in Chinese)
[18] 桂跃,余志华,刘海明等.高原湖相泥炭土次固结特性及机理分析[J].岩土工程学报,2015,37(8):1390～1398.Gui Yue,Yu Zhihua,Liu Haiming et al.Secondary consolidation properties and mechanism of plateau lacustrine peaty soil[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1390～1398.(in Chinese)
[19] Ajlouni MA.Geotechnical properties of peat and related engineering problems[D].University of Illinois at Urbana-Champaign,2000.
[20] Lea N,Brawner Co.Highway design and construction over peat deposits in the lower British Colombia[J].Highw.Res.Rec.,1963,7:1～32.
[21] Dhowian,A.w.and Edil,T.B..Consolidation behavior of peats[J].Geotechnical Testing Journal.GTJODJ,1980,3(3):105～114.
[22] Weber,W.G..Performance of embankments constructed over peat[J].J.Soil Mech.Found.Div.,ASCE,1969,95,(S1):53～76.
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