重庆市典型工程堆积体边坡物理力学变化及稳定性特征
发布时间：2019-06-28 09:11
【摘要】：以重庆市城镇建设活动形成的典型工程堆积体为研究对象,对工程堆积体边坡物理力学特性和入渗特征进行了研究,同时确定了工程堆积体边坡的危险滑动面及安全系数。在工程堆积体边坡上、中、下设置采样点,采集土壤样品进行土壤物理力学性质分析,采用野外双环入渗法进行入渗过程研究,运用GEO-SLOPE软件分析工程堆积体边坡稳定性。结果表明:(1)工程堆积体粒度分布不均匀,且2mm粒径的含量随着堆放时间的增加而增大;各工程堆积体分形维数在2.04~2.47之间变化,且表现为上坡位中坡位下坡位。(2)工程堆积体饱和含水量随坡位下降呈逐渐增加趋势;入渗率随时间变化呈快速减小、缓慢减小、稳定入渗3个阶段,2m、2a和4a堆积体稳定入渗率分别为4.53,3.17,7.02mm/min。(3)不同堆放时间的工程堆积体剪切力和剪切位移的关系呈硬化型曲线;粘聚力和内摩擦角分别在16.43~31.88kPa和2.23°~41.69°之间;不同堆放时间的工程堆积体安全系数均大于1.5,其稳定性大小依次为2a2m4a,最危险滑动面的安全系数分别为1.77,2.23,1.66。比较而言,堆放2a的工程堆积体稳定性最好,堆放2m的次之,堆放4a的工程堆积体稳定性最差。
[Abstract]:Taking the typical engineering accumulation formed by urban construction activities in Chongqing as the research object, the physical and mechanical characteristics and infiltration characteristics of the engineering accumulation slope are studied, and the dangerous sliding surface and safety factor of the engineering accumulation slope are determined at the same time. The sampling points were set up on the slope of the engineering accumulation body, and the soil samples were collected for the analysis of soil physical and mechanical properties. The infiltration process was studied by the field double ring infiltration method, and the stability of the engineering accumulation slope was analyzed by GEO-SLOPE software. The results show that: (1) the particle size distribution of engineering accumulation is uneven, and the content of 2mm particle size increases with the increase of stacking time, and the fractal dimension of each project deposit varies between 2.04 and 2.47, which shows that the saturated water content of engineering accumulation increases gradually with the decrease of slope position. The infiltration rate decreased rapidly and decreased slowly with time, and the stable infiltration rates of 2A and 4A deposits were 4.53, 3.17 and 7.02 mm 鈮，
本文编号：2507179
[Abstract]:Taking the typical engineering accumulation formed by urban construction activities in Chongqing as the research object, the physical and mechanical characteristics and infiltration characteristics of the engineering accumulation slope are studied, and the dangerous sliding surface and safety factor of the engineering accumulation slope are determined at the same time. The sampling points were set up on the slope of the engineering accumulation body, and the soil samples were collected for the analysis of soil physical and mechanical properties. The infiltration process was studied by the field double ring infiltration method, and the stability of the engineering accumulation slope was analyzed by GEO-SLOPE software. The results show that: (1) the particle size distribution of engineering accumulation is uneven, and the content of 2mm particle size increases with the increase of stacking time, and the fractal dimension of each project deposit varies between 2.04 and 2.47, which shows that the saturated water content of engineering accumulation increases gradually with the decrease of slope position. The infiltration rate decreased rapidly and decreased slowly with time, and the stable infiltration rates of 2A and 4A deposits were 4.53, 3.17 and 7.02 mm 鈮，
本文编号：2507179
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