Abstract：
In Shenzhen Software Park project, the foundation excavation soil is a mixture of miscellaneous fill, clay and silt, and the foundation pit slope has poor stability, so composite soil nail support combining soil nail and deep mixed pile waterstop curtain together is designed and adopted. Manual calculation process of soil nail wall is introduced in details. It is advanced that combined effect of all elements must be considered during design of composite soil nail support, because there may be different functional effects on different stratums.
