珠海西部中心城区大面积深厚软土工程特性研究
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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,然而由于受沉积环境等多种因素影响,软土的参数表现出较强的地域特性。以珠海市西部中心城区首期开发项目(A片区)大量的室内试验、原位十字板剪切和静力触探资料分析为基础,对珠海西部中心城区大面积的深厚软土工程特性及参数的相关性进行分析,研究结果表明:珠海西部中心城区软土含水率高达68%,含水率对绝大部分指标有明显的影响,含水率较高使得珠海市西部中心城区软土抗剪强度低,压缩性高;软土的有机质含量与其他物理力学性质相关性不明显,当有机质含量在2.11%～5.90%范围变化时对软土的天然物理力学性质影响不大;三轴CU剪强度指标与含水率、孔隙比之间的相关性要大于快剪抗剪强度指标,且三轴剪切试验黏聚力和内摩擦角更接近正态分布;从参数随深度变化规律来看,软土室内实验抗剪强度指标随深度变化不明显,现场十字板剪切试验所得抗剪强度和静力触探锤头阻力、侧壁摩擦力随深度的变化规律为先减小,后增大,强度在距离软土层顶部2～4 m位置最低,在接近软土层底部6～9 m时随深度增加速率明显加快,原位试验更能反映出土体强度的真实情况。
The physical and mechanical parameters of soft soils are the fundamental basis for the design of soft roadbed. However,the parameters of soft soils show strong regional characteristics due to various factors such as depositional environment. Based on a large amount of data from laboratory tests,vane shear tests and static penetration tests in the western central urban area of Zhuhai city(part A),the engineering characteristics and parameters correlation of large-scale deep soft soil were analyzed. The results show that the water content of the soft soil in the central area of western Zhuhai is as high as 68%,which leads to a low shear strength and a high compressibility of the soft soil. The organic content ranging from 2.11% to 5.90% has little effect on the natural physical and mechanical properties of the soft soil. The strength indexes of CU-tests have a greater correlation with the water content than the strength indexes of direct shear tests,and the cohesion and the friction angle of triaxial shear tests are closer to the normal distribution. The shear strength indexes of the soft soil by laboratory experiments have no significant change with the depth. However,the shear strength of vane shear tests,and the hammer resistance and sidewall friction of static penetration tests firstly reduce and then increase with increasing the depth. The strength of the soft soil reaches the minimum at 2–4 m from the top of the soft soil layer and acceleratingly increases while the depth reaches about 6–9 m from the bottom of the soft soil layer. The in-situ tests can actually reflect the real situation of the soil strength than the laboratory experiments.
The physical and mechanical parameters of soft soils are the fundamental basis for the design of soft roadbed. However,the parameters of soft soils show strong regional characteristics due to various factors such as depositional environment. Based on a large amount of data from laboratory tests,vane shear tests and static penetration tests in the western central urban area of Zhuhai city(part A),the engineering characteristics and parameters correlation of large-scale deep soft soil were analyzed. The results show that the water content of the soft soil in the central area of western Zhuhai is as high as 68%,which leads to a low shear strength and a high compressibility of the soft soil. The organic content ranging from 2.11% to 5.90% has little effect on the natural physical and mechanical properties of the soft soil. The strength indexes of CU-tests have a greater correlation with the water content than the strength indexes of direct shear tests,and the cohesion and the friction angle of triaxial shear tests are closer to the normal distribution. The shear strength indexes of the soft soil by laboratory experiments have no significant change with the depth. However,the shear strength of vane shear tests,and the hammer resistance and sidewall friction of static penetration tests firstly reduce and then increase with increasing the depth. The strength of the soft soil reaches the minimum at 2–4 m from the top of the soft soil layer and acceleratingly increases while the depth reaches about 6–9 m from the bottom of the soft soil layer. The in-situ tests can actually reflect the real situation of the soil strength than the laboratory experiments.
引文
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[11]杨光华,李俊,贾恺,等.改进的地基沉降计算的工程方法[J].岩石力学与工程学报,2017,36(增2):4 229-4 234.(YANGGuanghua,LI Jun,JIA Kai,et al.Improved settlement calculation method for engineering practice[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(Supp.2):4 229-4 234.(in Chinese))
[12]杨光华,黄致兴,李志云,等.考虑侧向变形的软土地基非线性沉降计算的简化法[J].岩土工程学报,2017,39(9):1 697-1 704.(YANG Guanghua,HUANG Zhixing,LI Zhiyun,et al.Simplified method for nonlinear settlement calculation in soft soils considering lateral deformation[J].Chinese Journal of Geotechnical Engineering,2017,39(9):1 697-1 704.(in Chinese))
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[18]雷华阳,卢海滨,王学超,等.振动荷载作用下软土加速蠕变的微观机制研究[J].岩土力学,2017,38(2):309-316.(LEI Huayang,LU Haibin,WANG Xuechao,et al.Research on microscopic mechanism of accelerated creep of soft clay under vibration loads[J].Rock and Soil Mechanics,2017,38(2):309-316.(in Chinese))
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[20]杨晓杰,刘冬明,王孝存.深厚软弱土层沉降变形规律堆载试验研究[J].岩石力学与工程学报,2017,36(增2):4 259-4 266.(YANGXiaojie,LIU Dongming,WANG Xiaocun.Loading tests study on settlement deformation law of deep soft soil layer[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(Supp.2):4 259-4 266.(in Chinese))
[21]陈成,周正明,张先伟,等.循环荷载作用下泥炭质土动力累积特性试验研究[J].岩石力学与工程学报,2017,36(5):1 247-1 255.(CHEN Cheng,ZHOU Zhengming,ZHANG Xianwei,et al.Experimental study on accumulative behaviour of peaty soil under cyclic loading.[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(5):1 247-1 255.(in Chinese))
[22]QUIGLEY R M.Geology,mineralogy,and geochemistry of Canadian soft soils:a geotec[J].Canadian Geotechnical Journal,1980,17(2):261-285.
[23]ROY D,ROBINSON K E.Surface settlements at a soft soil site due to bedrock dewatering[J].Engineering Geology,2009,107(3):109-117.
[24]WHEELER S J,N??T?NEN A,KARSTUNEN M,et al.An anisotropic elastoplastic model for soft clays[J].Canadian Geotechnical Journal,2003,40(2):403-418.
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