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Typical time-history curves of cyclic shear strain and double-amplitude shear strain of specimens
Figures of the Article
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Sketch of cyclic direct simple shear test apparatus
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Geographical location of sampling site in Yangtze River Estuary (Base map data © 2023 Google)
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Positions of tested marine soils in plasticity chart
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Shear strain time-history curves and shear stress-shear strain curves of specimen Y8-3
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Typical time-history curves of cyclic shear strain and double-amplitude shear strain of specimens
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Typical time-history curves of normal stress and excess pore water pressure for specimen Y8-3
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Typical time-history curves of excess pore water pressure ratio of marine clay (CSR=0.18)
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Sketch of area calculation of hysteresis curve
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Relationship curves of energy dissipation per cycle versus number of cycles of marine clays
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Sketch of method for determining number of cycles to failure
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Relationship between CSR and Nf of specimen Y1
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Curves of cyclic strength of marine clay in Yangtze River Estuary
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Variation of CSRth with IP of marine clay in Yangtze River Estuary
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Variation of $ {\gamma _{{\text{DA}},{\text{f}}}} $ with CSR of marine clay in Yangtze River Estuary
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Variation of $ {\gamma _{{\text{DA}},{\text{f}}}} $/IP1.5 with CSR-CSRth of marine clay in Yangtze River Estuary
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Variation of CSR with Nf and comparison of predicted and measured values of $ {\gamma _{{\text{DA}},{\text{f}}}} $ of marine clay in Liaodong Bay
Tables of the Article
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Measuring ranges, errors and precisions of sensors for cyclic direct simple shear test apparatus
传感器 量程 误差 精度 法向荷重传感器 5 kN 0.1%FS 0.2 N 第一剪切荷重传感器 5 kN 0.1% FS 0.2 N 第二剪切荷重传感器 5 kN 0.1% FS 0.2 N LVDT法向位移传感器 ± 2.5 mm 0.1% FS 0.1 μm LVDT剪切位移传感器 ± 10 mm 0.1% FS 0.4 μm 加载频率 ≤5 Hz — — 位移传感器 ± 25 mm 0.1% FS 0.8 μm 注：FS =满量程。 -
Basic physical properties of marine clay
取样区域 土样编号 海床以下深度H/m 相对质量密度Gs 天然含水率w0/% 天然密度ρ0/(g·cm-3) 初始孔隙比e0 饱和度Sr/% 塑限wp/% 液限wL/% 塑性指数IP 土类 长江入海口 Y1 6.6 2.71 37.85 1.82 1.05 97.78 23.8 81.6 57.8 CH Y2 8.6 2.65 40.10 1.79 1.07 99.41 30.9 71.0 40.1 CH Y3 16.6 2.69 41.21 1.79 1.12 98.60 30.2 65.6 35.4 CH Y4 7.6 2.69 37.52 1.83 1.03 98.33 27.5 62.3 34.8 CH Y5 22.0 2.70 39.28 1.81 1.07 98.75 26.4 58.5 32.1 CH Y6 28.1 2.71 38.56 1.82 1.06 98.49 29.2 60.0 30.8 CH Y7 15.1 2.69 40.12 1.80 1.09 97.81 25.4 48.9 23.5 CL Y8 16.6 2.68 37.80 1.82 1.03 98.38 23.8 39.9 16.1 CL Y9 20.6 2.68 39.11 1.78 1.10 95.46 18.4 34.7 16.3 CL Y10 19.2 2.69 44.80 1.76 1.21 99.68 19.3 30.8 11.5 CL 辽东湾营口段近海域 L1 17.3 2.68 40.50 1.79 1.11 98.17 16.7 32.8 16.1 CL L2 35.6 2.65 34.60 1.85 0.93 98.17 23.7 37.5 13.8 CL L3 55.6 2.67 33.20 1.85 0.92 96.18 21.7 38.2 16.5 CL 注：辽东湾营口段近海域的试样仅作验证用。 -
Schemes for cyclic direct simple shear tests
试样编号 σv/kPa CSR wc/% ec Δe/e0 质量等级 Nf/次 γDA, f/% 试样编号 σv/kPa CSR wc/% ec Δe/e0 质量等级 Nf/次 γDA, f/% Y1-1 50 0.202 36.55 1.013 0.034 1 664 6.61 Y6-1 190 0.152 35.94 0.989 0.068 2 > 1000 — Y1-2 0.221 36.62 1.015 0.032 1 237 7.83 Y6-2 0.178 36.09 0.993 0.064 2 330 6.26 Y1-3 0.248 36.62 1.015 0.032 1 81 8.53 Y6-3 0.202 36.02 0.991 0.066 2 60 7.08 Y1-4 0.271 36.73 1.018 0.029 1 47 9.61 Y6-4 0.221 35.87 0.987 0.070 2 20 8.11 Y2-1 60 0.170 36.94 1.007 0.058 2 > 1000 — Y7-1 100 0.139 37.61 1.042 0.043 2 > 1000 — Y2-2 0.201 36.68 1.000 0.065 2 223 6.94 Y7-2 0.158 37.50 1.039 0.046 2 657 5.08 Y2-3 0.221 36.79 1.003 0.062 2 42 7.85 Y7-3 0.181 36.56 1.013 0.070 2 67 6.50 Y2-4 0.249 36.57 0.997 0.068 2 20 8.94 Y7-4 0.221 36.85 1.021 0.062 2 16 8.18 Y3-1 110 0.164 37.55 1.032 0.082 3 > 1000 — Y8-1 120 0.124 36.30 1.000 0.029 1 > 1000 — Y3-2 0.182 37.88 1.041 0.074 3 654 6.38 Y8-2 0.148 36.12 0.995 0.034 1 621 5.27 Y3-3 0.199 38.31 1.053 0.063 2 188 6.80 Y8-3 0.179 36.05 0.993 0.035 1 51 6.83 Y3-4 0.219 38.09 1.047 0.069 2 70 7.46 Y8-4 0.221 35.94 0.990 0.038 1 5 8.23 Y4-1 50 0.162 35.99 0.992 0.033 1 > 1000 — Y9-1 140 0.124 35.72 1.014 0.076 3 > 1000 — Y4-2 0.181 35.27 0.972 0.052 2 486 6.18 Y9-2 0.150 35.89 1.019 0.072 3 638 5.16 Y4-3 0.203 35.38 0.975 0.049 1 103 7.84 Y9-3 0.180 36.00 1.022 0.069 2 51 6.74 Y4-4 0.222 34.83 0.960 0.064 2 30 8.92 Y9-4 0.221 36.39 1.033 0.059 2 8 8.13 Y5-1 145 0.153 36.48 1.001 0.068 2 > 1000 — Y10-1 130 0.105 42.24 1.140 0.058 2 > 1000 — Y5-2 0.182 36.69 1.007 0.063 2 304 6.10 Y10-2 0.117 42.37 1.152 0.048 2 596 4.41 Y5-3 0.205 37.17 1.020 0.050 2 86 7.60 Y10-3 0.148 41.82 1.137 0.059 2 159 5.89 Y5-4 0.225 36.84 1.011 0.059 2 25 9.09 Y10-4 0.179 42.23 1.148 0.050 2 19 6.99 L1-1 120 0.151 34.52 0.953 0.138 4 382 5.06 L3-1 370 0.163 27.08 0.763 0.149 4 173 5.22 L1-2 0.181 33.69 0.930 0.159 4 46 6.39 L3-2 0.180 26.90 0.758 0.177 4 40 6.31 L1-3 0.202 33.83 0.934 0.155 4 13 7.43 L3-3 0.201 26.97 0.760 0.152 4 5 7.28 L2-1 240 0.180 31.66 0.874 0.057 2 429 5.58 Y1-5 50 0.195 36.37 1.008 0.039 1 1342 4.88 L2-2 0.200 31.23 0.862 0.062 2 64 6.46 Y1-6 0.185 36.19 1.003 0.044 2 > 2000 — L2-3 0.222 31.52 0.870 0.054 2 33 7.46 Y1-7 0.175 36.01 0.998 0.049 2 > 1000 — 注：Y1 ~ Y10为长江入海口海洋黏土，L1 ~ L3为辽东湾营口段近海域海洋黏土，其中Y1-5 ~ Y1-7和L1 ~ L3仅作验证使用，试样质量等级评价详见表 4。wc为固结后试样的含水率；Δe为固结前后试样孔隙比的变化量；Nf为达到循环破坏标准所需的循环振次；γDA, f为达到循环破坏标准所需的循环破坏双幅剪应变。σv和CSR为试验的控制变量，wc，ec和Δe/e0为固结完成后的计算结果，Nf和γDA, f为测试结果。 -
Criteria for evaluation of specimen quality[41]
OCR Δe/e0 1 ~ 2 < 0.04 0.04 ~ 0.07 0.07 ~ 0.14 > 0.14 2 ~ 4 < 0.03 0.03 ~ 0.05 0.05 ~ 0.10 > 0.10 质量等级 1 2 3 4 试样质量 好~极好 好~差 差 极差 扰动程度 不扰动 轻微扰动 显著扰动 完全扰动 -
Fitting parameters for marine clay in different seas
试样编号 a b CSRth 可决系数R2 Y1 1.088 -0.675 0.191 0.982 Y2 0.313 -0.479 0.173 0.927 Y3 0.844 -0.671 0.172 0.957 Y4 0.280 -0.502 0.170 0.964 Y5 0.214 -0.396 0.160 0.966 Y6 0.186 -0.366 0.158 0.999 Y7 0.336 -0.547 0.148 0.991 Y8 0.143 -0.315 0.135 0.984 Y9 0.182 -0.346 0.132 0.994 Y10 0.221 -0.402 0.112 0.804 L1 0.201 -0.494 0.135 0.920 L2 0.284 -0.454 0.160 0.958 L3 0.146 -0.428 0.137 0.981
