Experimental study on construction parameters of collapsible loess foundation treated by vibrating rod compaction method

In order to determine the construction parameters of the vibrating rod compaction method to treat the collapsible loess foundation, the self-developed vibrating rod compaction method equipment is used to carry out field tests on the collapsible loess foundation site to analyze the vibration frequency, drill bit form, jet pressure and influences of vibration point spacing on construction efficiency and treatment effect. The test results indicate that under the conditions of the site, when the vibration frequency is 16 Hz, the use of A-type combined drill bits can reduce the adhesion of the fin soil, and the construction rate and compaction effect are the best. The high-pressure jet of 0.8 MPa can assist the sinking of the vibrating rod. Under this pressure, the bearing capacity of the foundation soil increases significantly. Using the above parameters, the cone tip resistance and sidewall resistance of the collapsible loess foundation after treatment with different vibration point spacings are controlled to increase by about 200%~300%. The smaller the vibration point spacing, the more significant the reinforcement effect, but the smaller the vibration point spacing is easy cause bonding, 1.2~1.4 m is appropriate. The research results can provide technical reference for the further application of the vibrating rod compaction method in collapsible loess foundation.