Abstract:

The data of earth pressure, pore water pressure, and deep soil displacement during metro jet system (MJS) method and highpressure jet grouting pile construction are collected in real-time via field pile to study the differences between the influences of the MJS method and high-pressure jet grouting pile (double-tube) on the surrounding environment in soft soil area, and reflect the difference of the compaction effect between them. The results show the following: (1) Both the MJS method and highpressure jet grouting pile show different degrees of compaction effect during construction; however, the compaction effect of the MJS method can be ignored. (2) The maximum earth pressure and pore water pressure induced by highpressure jet grouting pile construction are greater than those induced by the MJS method; the ratios of maximum pressure value and maximum pore water pressure between the highpressure jet grouting pile and MJS method are greater than 2.00 and 1.33, respectively. (3) The soil horizontal displacement due to MJS construction is smaller than that caused by ordinary high-pressure jet grouting pile construction; the horizontal displacement of the surface layer is larger in the MJS construction method and high-pressure jet grouting pile, whereas the soil horizontal displacement gradually decreases with an increase in depth. (4) The soil and pore water pressures at the same depth due to MJS construction and highpressure jet grouting pile construction gradually decrease with an increase in horizontal distance.

Key words:  , high-pressure jet grouting pile, metro jet system method, compaction effect, earth pressure, pore water pressure, deep soil displacement