In-situ test was conducted for the prestressed anchor rope composite soil nailing of a deep foundation pit for the Shenzhen Holiday Plaza to study the characteristics,the mechanism of interaction between soil nailing,prestressed anchor rope and soil,and the response of retaining structure to changes in the external environment,such as foundation pit excavation,anchor rope tension and rainfall.

Under the condition of high water level and sand or silt as foundation soil,the typical experiences of multiple support technologies for underground projects of adjacent buildings are introduced,including high-pressure spiral pile waterproof curtain,precipitation,micro pile and prestressed soil-nailing support.