Behavior of Resisting Soil Behind a Circular Caisson Well with Large Jacking Force

doi:10.16183/j.cnki.jsjtu.2014.11.002

Abstract

Abstract:

Analysis of soil counterforce and displacement of circular caisson pipe jacking project was made under the effect of different top edge using the site monitoring method as well as the comparative validation of distribution pattern of resistance of different open caisson using finite element numerical simulation methods. The results show that the distribution pattern of resistance of open caisson is approximated by a straight line which mutates in the depth of the caisson bottom due to the stiffness of the floor at large and reaches the maximum at the foot. The displacement of soil occurs less but as a whole under the jacking force. Simultaneously, the rationality of less than the active state was verified in the case that the soil of open caisson produces a smaller displacement under the caisson sinking back below the front wall of the active state which gives the variation of inking back soil reactions with the different distance.

Key words: pipe jacking, working well, circular caisson, earth counterforce, displacement

CLC Number:

TU432

ZHU Long, XU Zhen, BAI Zhan-wei, CHEN Jin-jian, WANG Jian-hua. Behavior of Resisting Soil Behind a Circular Caisson Well with Large Jacking Force[J]. Journal of Shanghai Jiao Tong University, 2014, 48(11): 1510-1516.

Figures/Tables 11

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土层号	土层名称	h／m	γ／（kN·m^-3）	c／kPa	φ／（°）	e₀	w／％	S_r／％	E_s／MPa
②₃	砂质粉土	1.10	18.7	3	30.4	0.823	29.4	96	9.19
③	粉质黏土	1.15	17.5	12	14.1	1.183	42.6	98	3.32
③_T	砂质粉土	1.85	18.8	2	30.6	0.822	29.8	98	11.42
③	粉质黏土	1.80	17.5	12	14.1	1.183	42.6	98	3.32
④	淤泥质黏土	13.10	16.8	11	10.9	1.429	50.9	98	2.32
⑤₁	黏土	6.85	17.7	15	14.5	1.156	40.8	97	3.46
⑦₁	黄～灰黄色砂质粉土	7.20	18.8	3	30.5	0.822	29.8	98	11.42
⑦₂	灰黄～灰色粉砂	26.95	19.0	2	31.5	0.760	27.0	95	13.72

F／MN	f₁／MN	f_b／MN	F_p／MN	q_max／kPa
10	4.464	2.956	2.080	26.5
14	4.464	2.956	6.580	77.2

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