Study on influence of parallel foundation pit construction on adjacent bridge and protection measures

doi:10.16265/j.cnki.issn1003-3033.2023.03.0685

Abstract

Abstract:

Taking the parallel foundation pit of pedestrian passage and bus passage attached to Qinghe railway station of high-speed railway passing through G7 high-speed Qinghe bridge as an example, the influence of parallel foundation pit excavation on adjacent bridges and the protection measures were studied. Firstly, considering the spatial effect of parallel foundation pit excavation, a finite element numerical model was established to analyze the superimposition effect of foundation pit excavation on adjacent bridge pile foundation. The calculation results show that the absolute settlement, differential settlement and inclination of the bridge piers all exceed the control values due to the superposition effect of the bridge pile disturbance caused by the excavation of the foundation pit. Combined with numerical simulation results and the similar engineering construction experience, a protective measure of using bored piles as isolation piles for adjacent bridges is proposed, and the layout of isolation piles is given according to the difference of influence of parallel foundation pit construction on different parts of adjacent bridges. The measured deformation results of adjacent bridge piers show that the isolation piles effectively constrain the superposition effect of foundation pit excavation and ensure the safe operation of G7 high-speed Qinghe bridge.

Key words: parallel foundation pit, adjacent bridge, protective measures, isolation pile, numerical simulation

ZHANG Zhongyu, LI Zhaoping, YANG Hang, LONG Qifeng, FENG Chao. Study on influence of parallel foundation pit construction on adjacent bridge and protection measures[J]. China Safety Science Journal, 2023, 33(3): 68-74.

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土层	厚度/ m	重度/ (kN·m^-3)	黏聚力/ kPa	内摩擦角/ (°)	泊松比 υ	压缩模量/ MPa
杂填土①	3.0	16.5	0	10	0.20	3.0
粉土②	4.2	19.3	18	30.6	0.25	9.8
黏土③	3.8	18.5	13	8.1	0.35	5.0
粉质黏土③	3.0	19.4	19	10.9	0.30	6.0
细砂中砂④	4.8	20.0	0	30	0.25	35.0
粉土⑤₁	8.2	20.3	10	30.1	0.25	21.3
细砂⑤₁	53	20.0	0	30	0.20	45

结构形式	材料	重度/ (kN·m^-3)	弹性模量/GPa	泊松比υ
混凝土横撑钻孔灌注桩冠梁	C30混凝土 C30混凝土 C30混凝土	24.5 24.5 24.5	30 30 30	0.25 0.25 0.25
钢支撑	Q235B	87	206	0.25
隔离桩	C30混凝土	24.5	30	0.25
喷混凝土	C25混凝土	24	28	0.2
墩柱	C50混凝土	25	32.5	0.3
承台	C40混凝土	25	32.5	0.25
桥桩	C30混凝土	24.5	30	0.25

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