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| Experimental Study of Super High Pressure Jet Grouting in Gravel Stratum |
| HU Qi-fan, ZHANG Ji-qing |
| (China Railway Design Corporation, Tianjin 300142, China) |
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Abstract Abstract：Research purposes： To solve the problem of water sealing and strengthening in ultra-deep and water-rich gravel stratum, the field test was carried out with the super high pressure jet grouting method, several sets of lock-joint or single high pressure jet grouting piles were constructed in the foundation pit which was under construction in Beijing, the diameter, strength and hydraulic conductivity of test piles and overlaps were measured in situ and by the experiments during the excavation of the foundation pit. Research conclusions： (1) Large diameter piles can be formed by super high pressure jet grouting in ultra- deep and water-rich dense gravel stratum, the diameter of which can be larger than 1.5 m, the largest diameter in the experiment is 2.6 m.（2）Overlap between super high pressure jet grouting piles can be formed in ultra-deep and water-rich gravel stratum, of which the mean strength is over 10 MPa and hydraulic conductivity can reach to the level of 10-8 cm/s, which can fully meet the requirements of reinforcement or water sealing.(3) Super high pressure jet grouting technology is feasible in technique and suitable for ultra-deep and water-rich gravel stratum, the method can be used as an auxiliary method for reinforcement and water sealing in similar stratum.
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Received: 15 November 2017
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2017, Vol. 34 
