珠海软土工程特性空间异性规律研究
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摘要
软土的物理力学参数是软基处理设计的基本依据。以珠海市西部中心城区首期开发项目(A片区)大量资料分析为基础,通过实验测试数据统计来探讨珠海市西部中心城区软土的分布和参数的空间异性规律。研究结果如下:通过对勘探数据处理,得到珠海西部中心城区A片区软土厚度分布等值线图;先期固结压力,无侧限抗压强度随深度的增加而增加,灵敏度和有机质含量不受深度变化影响;含水率、液限、塑限和塑性指数随深度的变化规律为先增大后减小;直剪强度指标随深度变化规律与含水率、液限、塑限等指标相反,呈先减小后增大的规律;原位试验结果与室内实验所得的结果有一致性又有区别,在使用室内试验强度指标设计时应充分参考原位试验结果。
The physical and mechanical parameters of soft soils are the fundamental basis for the design of soft roadbeds. Based on the analysis of amounts of test data in the central area of western Zhuhai, the distribution of soft soils and the laws of spatial anisotropy of parameters are discussed. The distribution contour map of the soft soils is obtained. The pre-consolidation pressure and the unconfined compressive strength increase with depth. The sensitivity and organic matter content are not affected by the change of depth. The water content, liquid limit, plastic limit and plasticity index changing with depth increase first and then decrease. The laws of direct shear strength indexes changing with depth are opposite to those with the water content, liquid limit and plastic limit, and they decrease first and then increase. The results of the in-situ tests are consistent with those obtained by the laboratory experiments, and there are also differences. When using the intensity indexes of laboratory experiments in design, the in-situ test results should be referred to.
The physical and mechanical parameters of soft soils are the fundamental basis for the design of soft roadbeds. Based on the analysis of amounts of test data in the central area of western Zhuhai, the distribution of soft soils and the laws of spatial anisotropy of parameters are discussed. The distribution contour map of the soft soils is obtained. The pre-consolidation pressure and the unconfined compressive strength increase with depth. The sensitivity and organic matter content are not affected by the change of depth. The water content, liquid limit, plastic limit and plasticity index changing with depth increase first and then decrease. The laws of direct shear strength indexes changing with depth are opposite to those with the water content, liquid limit and plastic limit, and they decrease first and then increase. The results of the in-situ tests are consistent with those obtained by the laboratory experiments, and there are also differences. When using the intensity indexes of laboratory experiments in design, the in-situ test results should be referred to.
引文
[1]沈珠江.软土工程特性和软土地基设计[J].岩土工程学报,1998,20(1):100-111.(SHEN Zhu-jiang.Engineering properties of soft soils and design of soft ground[J].Chinese Journal of Geotechnical Engineering,1998,20(1):100-111.(in Chinese))
[2]XIA J,HUANG G L,YAN S B.Behaviour and engineering implications of recent floodplain soft soil along lower reaches of the Yangtze River in Western Nanjing,China[J].Engineering Geology,2006,87(1):48-59.
[3]龚晓南.软土地区建筑地基工程事故原因分析及对策[C]//中国土木工程学会年会.西安,2000.(GONG Xiao-nan.Analysis of cause and countermeasures for accidents of building foundation engineering in soft soil area[C]//China Civil Engineering Society Annual Meeting.Xi'an,2000.(in Chinese))
[4]孔令伟,吕海波,汪稔,等.某防波堤下卧层软土的工程特性状态分析[J].岩土工程学报,2004,26(4):454-458.(KONG Ling-wei,LüHai-bo,WANG Ren,et al.Analysis on engineering property of underlying soft soil stratum ofa breakwater[J].Chinese Journal of Geotechnical Engineering,2004,26(4):454-458.(in Chinese))
[5]雷华阳,贾亚芳,李肖.滨海软土非线性蠕变特性的试验研究[J].岩石力学与工程学报,2013,32(增刊1):2806-2816.(LEI Hua-yang,JIA Ya-fang,LI Xiao.Experimental study of nonlinear creep property of soft soil in littoral area[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(S1):2806-2816.(in Chinese))
[6]宋许根,王志勇,柏威伟,等.珠海西部中心城区大面积深厚软土工程特性研究[J].岩石力学与工程学报,2019,38(7):1434-1451.(SONG Xu-gen,WANG Zhi-yong,BAIWei-wei,et al.Study on engineering characteristics of large-scale deep soft soil in central area of western Zhuhai[J].Chinese Journal of Rock Mechanics and Engineering,2019,38(7):1434-1451.(in Chinese))
[7]蒋水华,李典庆,周创兵,等.考虑参数空间变异性的非饱和土坡可靠度分析[J].岩土力学,2014,35(9):2569-2578.(JIANG Shui-hua,LI Dian-qing,ZHOU Chuang-bing,et al.Reliability analysis of unsaturated slope considering spatial variability[J].Rock and Soil Mechanics,2014,35(9):2569-2578.(in Chinese))
[8]LUMB P.The variability of natural soils[J].Canadian Geotechnical Journal,1966,3(2):74-97.
[9]VANMARCKE Erik.Random fields:analysis and synthesis[M].Cambridge:MIT Press,1983.
[2]XIA J,HUANG G L,YAN S B.Behaviour and engineering implications of recent floodplain soft soil along lower reaches of the Yangtze River in Western Nanjing,China[J].Engineering Geology,2006,87(1):48-59.
[3]龚晓南.软土地区建筑地基工程事故原因分析及对策[C]//中国土木工程学会年会.西安,2000.(GONG Xiao-nan.Analysis of cause and countermeasures for accidents of building foundation engineering in soft soil area[C]//China Civil Engineering Society Annual Meeting.Xi'an,2000.(in Chinese))
[4]孔令伟,吕海波,汪稔,等.某防波堤下卧层软土的工程特性状态分析[J].岩土工程学报,2004,26(4):454-458.(KONG Ling-wei,LüHai-bo,WANG Ren,et al.Analysis on engineering property of underlying soft soil stratum ofa breakwater[J].Chinese Journal of Geotechnical Engineering,2004,26(4):454-458.(in Chinese))
[5]雷华阳,贾亚芳,李肖.滨海软土非线性蠕变特性的试验研究[J].岩石力学与工程学报,2013,32(增刊1):2806-2816.(LEI Hua-yang,JIA Ya-fang,LI Xiao.Experimental study of nonlinear creep property of soft soil in littoral area[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(S1):2806-2816.(in Chinese))
[6]宋许根,王志勇,柏威伟,等.珠海西部中心城区大面积深厚软土工程特性研究[J].岩石力学与工程学报,2019,38(7):1434-1451.(SONG Xu-gen,WANG Zhi-yong,BAIWei-wei,et al.Study on engineering characteristics of large-scale deep soft soil in central area of western Zhuhai[J].Chinese Journal of Rock Mechanics and Engineering,2019,38(7):1434-1451.(in Chinese))
[7]蒋水华,李典庆,周创兵,等.考虑参数空间变异性的非饱和土坡可靠度分析[J].岩土力学,2014,35(9):2569-2578.(JIANG Shui-hua,LI Dian-qing,ZHOU Chuang-bing,et al.Reliability analysis of unsaturated slope considering spatial variability[J].Rock and Soil Mechanics,2014,35(9):2569-2578.(in Chinese))
[8]LUMB P.The variability of natural soils[J].Canadian Geotechnical Journal,1966,3(2):74-97.
[9]VANMARCKE Erik.Random fields:analysis and synthesis[M].Cambridge:MIT Press,1983.
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