EXPERIMENTAL STUDY ON THE COMPRESSIVE AND SHEAR STRENGTH OF SEASONAL FROZEN SOIL IN DONGNING AREA, HEILONGJIANG PROVINCE
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摘要:
以牡丹江市东宁地区土层(粉土、粉质黏土、黏土)为研究对象, 通过工程钻探等技术手段实地采取原状土样, 筛选不同含水率、不同土质的样品, 经过室内试验设置不同负温条件对原状土单轴抗压强度和三轴剪切强度等物理力学性质进行研究.结果显示, 原状土在不同负温条件下冻结后单轴抗压强度随着温度的降低而增大, 黏聚力随着含水率的增加呈指数型增大, 内摩擦角随含水率的增加先增加后趋于稳定; 在试验负温条件下, -20℃为变化界限, 小于-20℃时, 冻结土体的单轴抗压强度随含水率的增加呈现先增加后减小的变化规律, 黏聚力随着冻结温度降低而增大, -10℃、-20℃条件下冻土的内摩擦角有相似的规律, 未随含水率增减发生明显变化, 此时冻土抗剪强度随着冻结温度的降低而增加; 大于-20℃时, 冻结土体的单轴抗压强度随含水率的增加而增加, 黏聚力不随冻结温度降低而增加, 内摩擦角随着冻结温度的降低而增大, 冻土抗剪强度随着冻结温度的降低缓慢增大趋于冰的剪切强度.
Abstract:Taking the soil layers including silt, silty clay and clay in Dongning area of Mudanjiang City as the research object, collecting and selecting the undisturbed soil samples with different moisture content and soil texture, the paper studies the physical and mechanical properties of soil such as uniaxial compressive strength and triaxial shear strength under different negative temperature conditions. The results show that the uniaxial compressive strength of undisturbed soil increases with the decrease of temperature after freezing under different negative temperature conditions; the cohesion increases exponentially with the increase of moisture content; while the internal friction angle first increases and then tends to be stable with the increase of moisture content. Under the negative temperature conditions, -20℃ is the change point. When the temperature is below -20℃, the uniaxial compressive strength of frozen soil first increases and then decreases with the increase of moisture content, and the cohesion increases with the decrease of freezing temperature; At -10℃ or -20℃, the internal friction angle of frozen soil follows a similar rule, no obvious change with the fluctuation of water content, and the shear strength of frozen soil increases with the decrease of freezing temperature; When it is above -20℃, the uniaxial compressive strength of frozen soil increases with the increase of water content, and the cohesion does not increase with the decrease of freezing temperature, while the internal friction angle increases with the decrease of freezing temperature, and the shear strength of frozen soil gradually increases and tends to that of ice with the decrease of freezing temperature.
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表 1 土样的基本物理指标
Table 1. Basic physical indexes of soil samples
序号 土质 含水率/% 抗压强度/MPa 黏聚力/MPa 内摩擦角/（°） -10 ℃ -20 ℃ -30 ℃ -10 ℃ -16 ℃ -19 ℃ -20 ℃ -30 ℃ -10 ℃ -20 ℃ -22 ℃ -25 ℃ -30 ℃ 1 粉土 14.80 1.33 3.89 7.43 0.17 0.29 0.34 0.38 0.46 28.69 27.80 30.01 35.66 39.03 2 粉土 15.79 1.98 4.72 7.82 0.17 0.35 0.38 0.46 0.44 26.69 27.80 30.72 37.70 40.03 3 粉土 16.42 2.36 5.49 8.05 0.19 0.31 0.37 0.52 0.58 32.02 34.40 31.15 37.96 45.54 4 粉土 17.29 3.28 7.41 8.37 0.26 0.29 0.34 0.61 0.63 34.18 35.60 33.16 38.60 53.26 5 粉土 21.27 4.43 7.85 9.66 0.39 0.35 0.37 1.07 1.12 35.79 35.20 35.75 42.06 50.69 6 粉土 23.22 4.84 8.13 10.20 0.49 0.39 0.44 1.36 1.41 33.89 35.30 35.46 43.1 45.83 7 粉土 31.35 3.90 8.78 11.83 1.07 0.41 0.43 2.97 3.29 31.89 33.20 37.46 44.00 48.81 8 粉质黏土 15.19 1.28 4.87 7.59 0.25 0.39 0.45 0.41 0.45 28.78 27.90 37.95 43.26 42.18 9 粉质黏土 16.42 2.36 4.85 8.05 0.19 0.52 0.88 0.52 0.54 29.79 28.90 37.65 43.56 43.62 10 粉质黏土 16.81 2.58 5.83 8.20 0.28 0.59 1.00 0.56 0.58 32.16 33.50 38.82 46.21 48.24 11 粉质黏土 17.23 2.82 5.03 8.35 0.42 0.64 1.04 0.60 0.62 32.26 33.60 38.12 46.01 49.38 12 粉质黏土 24.48 4.97 8.64 10.53 0.57 0.69 0.98 1.56 1.52 35.23 36.70 38.94 45.12 52.85 13 粉质黏土 29.87 4.39 8.36 11.61 1.24 0.77 1.1 2.62 2.76 34.16 31.40 38.42 46.61 46.22 14 粉质黏土 34.62 3.20 7.27 12.19 1.38 0.76 1.19 3.83 3.48 35.32 37.50 39.58 46.73 54.00 15 粉质黏土 35.03 2.08 7.63 12.23 1.48 0.96 1.22 3.94 3.70 36.96 38.50 39.72 47.21 53.44 16 黏土 22.22 4.66 8.43 9.94 0.41 1.53 2.11 1.21 1.15 32.83 35.40 37.26 44.3 50.98 17 黏土 22.66 4.75 7.89 10.06 0.46 1.91 2.65 1.27 1.32 34.80 34.20 38.44 43.11 49.25 18 黏土 23.33 4.85 9.88 10.23 0.59 2.09 2.79 1.37 1.43 33.89 35.30 40.76 47.9 50.83 19 黏土 24.79 4.75 9.84 10.60 0.58 2.39 3.11 1.61 1.68 34.94 36.40 41.56 48.7 51.42 20 黏土 32.25 3.50 9.42 11.95 1.15 2.61 3.29 3.19 3.32 36.06 38.60 41.92 48.11 55.58 测试单位：黑龙江省水利科学研究院. 
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