Influence of Slurry Diffusion on Drag Reduction During Pipe Jacking Cnstruction

doi:10.16183/j.cnki.jsjtu.2022.446

Abstract

Abstract:

Slurry diffusion is the key factor affecting the resistance reduction of pipe jacking grouting. Therefore, this paper establishes a three-dimensional numerical analysis model of pipe jacking, introduces a diffusion ring to simulate the slurry diffusion process during pipe jacking construction, modifies the friction coefficient according to the contact between the soil around the pipe and the segment, and studies the influence of the slurry diffusion process on the resistance reduction effect during pipe jacking construction. The calculated jacking friction is compared with the measured data to verify the reliability of the method proposed. The influence of the filtering effect on soil displacement and the influence of grouting diffusion-related parameters on soil displacement and jacking friction during pipe jacking construction are further studied. The results show that the surface subsidence is smaller when the filtration effect is considered; The stronger the attenuation of permeability coefficient caused by the filtration effect, the smaller the surface settlement and jacking friction resistance; The faster the slurry diffuses and the more complete the slurry jacket is, the better the resistance reduction effect of grouting during pipe jacking.

Key words: pipe jacking construction, resistance reduction by grouting, numerical simulation, slurry diffusion

CLC Number:

TU443

XU Haodong, YU Tongzhen, FAN Wei, LI Mingguang, LIU Nianwu. Influence of Slurry Diffusion on Drag Reduction During Pipe Jacking Cnstruction[J]. Journal of Shanghai Jiao Tong University, 2024, 58(7): 1067-1074.

Figures/Tables 13

Fig.1

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Tab.1

Values of parameters related to model

序号	H/ m	γ/ (kN·m^-3)	e	c'/ kPa	φ'/ (°)	$E o e d r e f$ / MPa	$E 50 r e f$ / MPa	$E u r r e f$ / MPa	R_f	$G 0 r e f$ / MPa	γ_0.7× 10⁴	k/ (cm·s^-1)
黏土②₁	12.5	18.4	0.95	10	27	7.16	8.80	50.14	0.9	200.5	2.7	5.21×10^-7
淤泥质黏土④	10	16.7	1.41	6	24	5.80	7.08	40.56	0.6	162.2	2.7	2.38×10^-7
粉质黏土⑤₁	2.5	18.0	1.01	5	28	4.52	5.43	31.66	0.9	126.6	2.7	3.37×10^-7
砂质黏土⑤₂	2.5	17.7	0.99	2	30	5.97	7.16	41.79	0.9	167.1	2.7	3.07×10^-4
粉质黏土	4	18.0	0.99	4	28	4.37	5.24	30.58	0.9	122.3	2.7	2.70×10^-6
粉质黏土	8	18.2	0.94	5	30	4.48	5.37	31.34	0.9	125.3	2.7	1.57×10^-7
砂质粉土	22.5	19.0	0.73	1	30	13.31	13.31	53.23	0.9	266.1	2.7	6.99×10^-4
粉细砂	22	19.2	0.71	0	30	14.25	14.25	57.00	0.9	285.0	2.7	8.76×10^-4

Tab.1

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