悬挂式止水帷幕基坑降水开挖对临近高铁桥墩影响

doi:10.3976/j.issn.1002-4026.2022.06.015

Abstract

Abstract:

In the case of a deep aquifer, a suspended waterproof curtain is typically used in foundation pit engineering. The depth of the waterproof curtain exerts a crucial impact on the deformation of surrounding surface and buildings owing to dewatering and excavation of foundation pit. To study the impact of the dewatering and excavation of foundation pit on the deformation of adjacent high-speed railway piers under different depths of the waterproof curtain, a three-dimension finite element software was used to numerically simulate the dewatering and excavation of a subway station foundation pit in Suzhou. Results show that with increasing depth of the waterproof curtain, the settlement of piers adjacent to the foundation pits gradually decreases. When the depths of the waterproof curtain are 41 and 91 m, the pier settlements of the high-speed railway are 31.88 and 4.18 mm, respectively. Moreover, the settlement of the pier meets the control requirements (≤5 mm) only if the depth of the waterproof curtain exceeds 91 m.

Key words: foundation pit, suspended waterproof curtain, dewatering and excavation, settlement for high-speed railway piers, numerical simulation

CLC Number:

TV551.4

LI Peng-ju, QIAN Lin-gen, WU Qiang, HUANG Shan, CHEN Su. Impact of foundation pit dewatering and excavation with suspended waterproof curtain on adjacent high-speed railway piers[J].Shandong Science, 2022, 35(6): 116-122.

Figures/Tables 12

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References 18

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标号	土体名称	土层厚度/m	重度/(kN·m^-3)	压缩模量/MPa	黏聚力/kPa	内摩擦角/(°)	泊松比	渗透系数/(cm·s^-1)
①₁	杂填土	2.40	18.0	2.01	12.0	15.0	0.35	1×10^-6
②₁	粉质黏土	3.40	19.5	4.63	22.2	13.5	0.33	5×10^-6
③₁	黏土	4.80	20.1	6.99	53.6	14.5	0.28	2×10^-6
③₂	粉土	8.30	19.3	9.76	5.9	26.8	0.35	1.5×10^-3
④₂	粉砂夹粉土	22.10	19.2	10.98	6.5	31.7	0.31	3.5×10^-3
⑦₂	粉土夹粉砂	17.00	19.4	9.34	60.0	27.3	0.29	6×10^-3

名称	单元类型	重度/(kN·m^-3)	弹性模量/GPa	泊松比	截面面积/m²	惯性矩×10^-2/m⁴
混凝土支撑	1D梁单元	25	33.600	0.20	0.800	4.27
钢支撑	1D梁单元	70	210.000	0.24	0.049	0.37
冠梁	1D梁单元	25	34.400	0.21	1.600	34.13
格构柱	1D梁单元	70	210.000	0.24	0.064	0.41
立柱兼抗拔桩	1D梁单元	25	32.700	0.20	0.567	2.56
高铁桩基础	1D梁单元	25	32.700	0.20	0.785	0.05
高铁桥墩、桥台	3D实体单元	25	33.500	0.20	—	—
地下连续墙	2D板单元	25	35.500	0.21	—	—
全方位高压喷射法(MJS)隔水帷幕	3D实体单元	24	0.028	0.28	—	—

Impact of foundation pit dewatering and excavation with suspended waterproof curtain on adjacent high-speed railway piers

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