Field Test of Mechanical Properties of Large Diameter Concrete Jacking Pipe in Soft Soil

doi:10.16183/j.cnki.jsjtu.2014.11.001

Abstract

Abstract:

Annular reinforcing steel bar stress and pipe-soil contact pressure during pipe-jacking were monitored on the spot. The differences of the active contact pressure from the related research results were analyzed. The results show that when the pipe is pulled in the stable slurry interface which has been already formed, and since the test pipe was pulled into the tunnel bore, the distribution of contact pressure tends to be uniform and remain stable. But the contact pressure will increase suddenly when grouting, and return to normal gradually after stopping pulling. The lateral force of the pipe is also stable, though not big, mainly showing compressive stress, whose changing is controlled by pipeline axial deviation and grouting. Therefore, the pipe is in a state of eccentric compression in the test. Compared with the results of the field test, the specification is rather conservative. Besides, the active distribution of contact pressure is close to the load model developed by Lei Han, which can be used to optimize pipeline structure design.

Key words: large diameter jacking-pipe, soil-pipe contact pressure, site monitoring

CLC Number:

TU432

LIU Xiang, BAI Hai-mei, CHEN Xiao-chen, CHEN Jin-jian, WANG Jian-hua. Field Test of Mechanical Properties of Large Diameter Concrete Jacking Pipe in Soft Soil[J]. Journal of Shanghai Jiao Tong University, 2014, 48(11): 1503-1509.

Figures/Tables 18

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土层名称	w／％	γ／（kN·m^-3）	e₀	c／kPa	i／（°）	E_s／MPa
①素填土	29.8	18.8	0.85	22	15.3	5.58
②₃砂质黏土	30.4	18.6	0.85	3	30.4	9.22
③粉质黏土	42.6	17.5	1.18	12	13.4	3.32
③_T砂质粉土	29.8	18.8	0.82	2	30.3	11.42
④淤泥质黏土	50.9	16.8	1.43	11	10.8	2.32
⑤₁黏土	40.8	17.6	1.16	15	14.0	3.46

编号	顶进期间				顶通后			规程^[9]	文献[8]
编号	最小	最大	均值	顶通日	3月	4月	7月	规程^[9]	建议模式1	建议模式2
T1-1	162	318	234	260	174	163	163	302.93	253.97	172.66
T1-2	-	-	-	-	-	-	-	185.50	221.31	163.84
T1-3	165	254	191	190	200	193	187	136.86	152.36	146.20
T1-4	142	277	177	200	151	147	145	199.29	196.84	145.59
T1-5	111	218	161	187	157	157	160	144.98	144.98	144.98
T1-6	124	198	168	184	145	143	146	199.29	196.84	145.59
T1-7	157	220	185	208	162	157	153	136.86	152.36	146.20
T1-8	186	240	215	234	198	188	177	185.50	221.31	163.84

点位	本文大直径顶管（H／D＝2.15）				文献[5]中小直径顶管（H／D＝2.28）
点位	静止土压力／kPa	实测理论应力比	实测应力／kPa	无量纲应力比	静止土压力／kPa	实测理论应力比	实测应力／kPa	无量纲应力比
T1-5	178	1.10	161	1.00	64	0.97	66	1.00
T1-7	149	0.81	185	1.15	52	0.35	150	2.72
T1-1	261	1.12	234	1.45	92	?	?	?
T1-3	149	0.78	191	1.19	52	0.39	135	2.05