Pile foundations may experience scour due to the combined action of waves and currents during service,and protection measures are usually needed to prevent further scour.Cement-improved soil is a new type of scour protection method.Firstly,a large number of incipient motion tests was conducted to explore the anti-scour performance of cement-improved soil under different cement mixing ratios,curing times,and other conditions.Subsequently,a series of flume tests were conducted on cement-improved soil protection monopiles,obtaining the time history development curves of local scour depth around piles with different protection ranges under the combined action of waves and currents.The scour protection performance of cement-improved soil with different protection thicknesses was compared and analyzed through the scour hole pits before and after the test.Finally,the scour protection efficiency parameter was proposed to more intuitively evaluate the scour protection performance of cement-improved soil with different protection ranges.
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