Field study of the effect of jet grouting parameters on strength based on tensile and unconfined compressive strength

Abstract

The improvement of the mechanical soil characteristics of jet grouting technique is very attractive. The jet grouted soil cement columns in soft is a complicated issue because it depends on a number of factors such as, soil nature, mixture, influence among soil and grouting materials, jetting force of nozzle, jet grouting and water flow rate, rotation and lifting speed. This paper discusses the estimation of shear strength parameters of soil-cement column (soilcrete) in soft clayey soil based on the relationships between the unconfined compressive and split tensile strength for the soilcrete and the effect of the jet grouting and water pressure in the values of cohesion and internal friction. For this reason, theoretical and field work models have been developed. The relation between split tensile and unconfined compressive strength results were used to draw a Mohr’s circle and failure enveloped to define the shear strength parameters of soilcrete. According to that, the results indicate that the resistance of the jet grout columns increases by increasing the nominal resistance of the grouting material (cement), water and jet grouting pressure. The shear resistance variables are increased by increasing the unconfined compressive and tensile strength of the jetting column. The value of the unconfined compressive strength ranges from (2.78-5.52 MPa). While the internal friction angle varies from 38° to 44°. On the other hand, the tensile strength is increased by increasing the unconfined compressive strength and ranges from (0.66-1.02 MPa).

Characteristics of Pile Models Injected by Low-Pressure-Injection Laboratory Setup for Chemical Improving Loose Sandy Soil

“…However, current investigators have found that the square root correlation between splitting tensile strength and compressive strength is not the best fit for maturing concrete, and the power of compressive strength ranges from 0.6 to 0.8 [33]. [34], and AL-Kinani and Ahmed-2020 [35]).…”

“…Figure 10: Mohr-Coulomb Envelope for Mohr circles stress of T and UCS of the injected soil (after Kramadibrata et al-2008[34], and AL-Kinani and Ahmed-2020[35]). …”

Stiffness evolution of jet grouting columns performed under port caissons using PS suspension logging

“…There are numerous studies on the stiffness evolution of cement‐treated soils based on laboratory tests or numerical models (Kang et al, 2017; Subramaniam & Banerjee, 2020; Tinoco et al, 2014), but not on in situ tests. It is worth noting that the works based on field tests that study the strength at different times are carried out on test columns (Al Kinani et al, 2020) and allow checking the evolution of the strength after 28 days, so it is not possible to test during the early stages of setting.…”