Experimental research on lateral pressure of five-compartment cement silo wall with inverted cone-bottom

In the cement industry, five-compartment silos are employed to achieve the "a silo multi-storage" function, aiming to save costs and land area. However, when designing a five-compartment cement silo, fan-ring section and inverted cone-bottom shape make it difficult to accurately calculate the wall lateral pressure because heightto-diameter ratio and calculated storage height ill-defined. This paper designs two models of five-compartment silo with flat-bottom and inverted cone-bottom with 1000 mm outer diameter and 2000 mm high, completes experiments on static and dynamic lateral pressures for four tests. Calculated storage height is the clear height from the upper surface of the stored material to the point where the silo wall meets the inverted cone-bottom; The more elongated compartments cause 73 % of static average lateral pressure to exceed Janssen theoretical values; More than 80 % of maximum dynamic lateral pressure during discharge appear at the moment of initial cement outflow and mass flow stage, dynamic pressure fluctuation at inverted cone-bottom is more obvious; The concept of overpressure contrast coefficient is proposed and modified lateral pressure calculation formulas applicable to slender five - compartment reinforced concrete silos are given.