Simulation and prediction of Yancheng ground subsidence based on Bio-consolidation theory
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摘要:
城市地面沉降可能会对建筑物和基础设施造成损坏，影响城市的整体稳定性和安全性。文章以江苏省盐城市区为研究对象，以比奥固结理论为基础，引入黏弹塑性土体本构模型，并考虑土体参数随应力状态的非线性变化，建立了盐城市建筑荷载和地下水开采与地面沉降三维变参数全耦合黏弹塑性模型。结果表明：在建筑荷载和地下水开采条件下，研究区地下水水位持续回升，整体出现回弹现象，但在建筑荷载较大的中心城区，地面回弹量较小，甚至出现轻微沉降，且2021—2023年产生的最大水平位移为15 mm。研究结果可为盐城市防治和减轻地面沉降危害提供科学依据。
Abstract:Ground subsidence occurred in urban area may cause damage to buildings and infrastructure, affecting the overall stability and safety of the city. This paper established a three-dimensional variable parameter fully-coupled viscoelastic-plastic model of building loads and groundwater mining with ground subsidence in Yancheng, Jiangsu Province based on the theory of Bio-consolidation, introduced the viscoelastic-plastic soil constitutive model, and meanwhile took the nonlinear change of soil parameters with the state of stress into account. The results show that the groundwater level in the study area continually rises under the conditions of construction loading and groundwater extracting, with an overall rebound phenomenon. However, in the centre of the city, where the building loads are high, the amount of ground rebound is small and even slight settlement occurs, and the maximum horizontal displacement produced over 10 years is 15 mm. The results of the study can provide scientific basis for the prevention and mitigation of ground subsidence hazards in Yancheng.
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Key words:
- Yancheng /
- groundwater extraction /
- ground subsidence /
- building load /
- Bio-consolidation theory
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表 1 盐城市含水层参数分区表
Table 1. Parameter partition of aquifer in Yancheng
分区 主轴方向渗透系数/（m/d） 变形模量/MPa 泊松比 粘聚力/KPa 摩擦角/° 膨胀角/° 重度/（KN/m3） 有效孔隙度 Kxx Kyy Kzz E ν c φ ψ Γ n 1 3.2 3.2 0.32 27 0.40 3.0 33.6 0 20.42 0.422 2 4.4 4.4 0.44 26 0.45 5.0 34.3 0 21.54 0.418 3 2.8 2.8 0.28 24 0.39 6.0 35.1 0 20.73 0.425 4 3.5 3.5 0.35 25 0.38 8.0 35.7 0 21.41 0.416 5 3.2 3.2 0.32 23 0.36 5.5 34.8 0 19.86 0.419 6 3.6 3.6 0.36 25 0.42 4.5 34.2 0 20.28 0.428 7 4.1 4.1 0.41 27 0.47 4.0 34.0 0 19.75 0.431 8 3.4 3.4 0.34 22 0.48 3.0 33.6 0 20.64 0.418 9 5.2×10−3 5.2×10−3 5.2×10−4 18 0.48 15.0 21.5 0 21.37 0.522 10 4.3×10−3 4.3×10−3 4.3×10−4 16 0.47 17.0 23.2 0 20.68 0.518 11 4.6×10−3 4.6×10−3 4.6×10−4 15 0.48 18.0 20.9 0 20.24 0.525 12 5.0×10−3 5.0×10−3 5.0×10−4 17 0.48 14.0 21.2 0 19.57 0.516 13 5.5×10−3 5.5×10−3 5.5×10−4 19 0.48 15.0 20.8 0 19.11 0.519 14 34 34 3.4 30 0.38 4.0 34.2 0 21.32 0.437 15 33 33 3.3 28 0.40 3.5 35.1 0 20.87 0.422 16 30 30 3.0 31 0.37 4.0 34.7 0 20.55 0.416 17 28 28 2.8 29 0.39 4.3 33.6 0 20.38 0.426 18 24 24 2.4 32 0.36 5.5 33.2 0 20.14 0.430 19 35 35 3.5 33 0.35 4.8 34.0 0 21.11 0.421 20 32 32 3.2 29 0.41 4.6 34.5 0 22.13 0.419 21 40 40 4.0 27 0.42 3.8 35.0 0 20.72 0.424 22 36 36 3.6 26 0.40 3.5 35.8 0 20.16 0.417 23 2.6×10−4 2.6×10−4 2.6×10−5 25 0.44 18.2 20.6 0 19.76 0.492 24 3.0×10−4 3.0×10−4 3.0×10−5 22 0.48 17.5 20.6 0 20.33 0.488 25 3.3×10−4 3.3×10−4 3.3×10−5 21 0.46 17.2 20.6 0 19.54 0.485 26 2.8×10−4 2.8×10−4 2.8×10−5 23 0.48 16.7 20.6 0 20.48 0.506 27 2.0×10−4 2.0×10−4 2.0×10−5 24 0.47 16.1 20.6 0 21.25 0.490 28 2.4×10−4 2.4×10−4 2.4×10−5 26 0.45 16.5 20.6 0 21.66 0.483 29 5.0 5.0 0.50 36 0.38 5.3 34.2 0 20.11 0.397 30 5.6 5.6 0.56 35 0.41 4.2 35.4 0 19.83 0.382 31 6.2 6.2 0.62 34 0.39 4.8 36.6 0 19.97 0.376 32 5.3 5.3 0.53 38 0.42 6.6 31.8 0 20.42 0.390 33 5.1 5.1 0.51 39 0.40 5.8 32.4 0 20.63 0.385 34 6.0 6.0 0.60 41 0.44 6.3 36.1 0 21.37 0.388 35 4.5 4.5 0.45 38 0.41 5.7 35.5 0 20.44 0.391 36 4.8 4.8 0.48 36 0.41 5.5 35.0 0 20.71 0.393 37 2.0×10−4 2.0×10−4 2.0×10−5 32 0.48 17.6 21.1 0 20.64 0.492 38 1.6×10−4 1.6×10−4 1.6×10−5 35 0.43 18.8 20.7 0 20.52 0.488 39 1.0×10−4 1.0×10−4 1.0×10−5 34 0.46 19.4 20.5 0 20.73 0.485 40 1.2×10−4 1.2×10−4 1.2×10−5 36 0.44 18.7 20.8 0 20.16 0.506 41 1.8×10−4 1.8×10−4 1.8×10−5 35 0.42 18.2 21.2 0 19.92 0.490 42 7.0×10−5 7.0×10−5 7.0×10−6 33 0.47 17.8 20.3 0 19.63 0.483 43 9.0×10−5 9.0×10−5 9.0×10−6 32 0.45 17.5 20.4 0 19.17 0.482 44 13 13 1.3 45 0.39 5.8 34.8 0 20.18 0.435 45 12 12 1.2 46 0.41 6.2 34.2 0 20.54 0.432 46 18 18 1.8 50 0.40 6.0 33.7 0 21.62 0.426 47 20 20 2.0 48 0.38 5.9 33.4 0 20.35 0.420 48 16 16 1.6 46 0.36 6.5 32.8 0 21.24 0.433 49 12 12 1.2 53 0.39 6.4 32.5 0 21.33 0.428 50 14 14 1.4 48 0.37 6.1 33.4 0 21.17 0.419 51 9 9 0.9 49 0.41 5.8 35.5 0 20.93 0.413 52 8.5 8.5 0.85 51 0.43 5.7 36.1 0 20.54 0.417 53 3 3 0.3 47 0.45 5.3 37.0 0 20.36 0.437 54 4.5 4.5 0.45 45 0.46 5.0 37.5 0 20.22 0.422 
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