發(fā)布時間：2019-06-28 09:11

【摘要】：以重慶市城鎮(zhèn)建設(shè)活動形成的典型工程堆積體為研究對象,對工程堆積體邊坡物理力學(xué)特性和入滲特征進(jìn)行了研究,同時確定了工程堆積體邊坡的危險滑動面及安全系數(shù)。在工程堆積體邊坡上、中、下設(shè)置采樣點(diǎn),采集土壤樣品進(jìn)行土壤物理力學(xué)性質(zhì)分析,采用野外雙環(huán)入滲法進(jìn)行入滲過程研究,運(yùn)用GEO-SLOPE軟件分析工程堆積體邊坡穩(wěn)定性。結(jié)果表明:(1)工程堆積體粒度分布不均勻,且2mm粒徑的含量隨著堆放時間的增加而增大;各工程堆積體分形維數(shù)在2.04~2.47之間變化,且表現(xiàn)為上坡位中坡位下坡位。(2)工程堆積體飽和含水量隨坡位下降呈逐漸增加趨勢;入滲率隨時間變化呈快速減小、緩慢減小、穩(wěn)定入滲3個階段,2m、2a和4a堆積體穩(wěn)定入滲率分別為4.53,3.17,7.02mm/min。(3)不同堆放時間的工程堆積體剪切力和剪切位移的關(guān)系呈硬化型曲線;粘聚力和內(nèi)摩擦角分別在16.43~31.88kPa和2.23°~41.69°之間;不同堆放時間的工程堆積體安全系數(shù)均大于1.5,其穩(wěn)定性大小依次為2a2m4a,最危險滑動面的安全系數(shù)分別為1.77,2.23,1.66。比較而言,堆放2a的工程堆積體穩(wěn)定性最好,堆放2m的次之,堆放4a的工程堆積體穩(wěn)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，

本文編號：2507179