Argillaceous soft rock is a special rock; the design of anti-slide pile in argillaceous soft rock is difficult because some design parameters are unknown. Through the laboratory horizontal static load test for large undisturbed samples and the numerical simulation calculation

the proportional coefficient m of ground horizontal resistance coefficient needed in the design of anti-slide pile for argillaceous soft rock is studied. This paper gives reference values of the proportional coefficient m; and discusses the factors affecting m of argillaceous soft rock. It is concluded as follows. The m value scope of the tertiary mudstone (argillaceous soft rock)of Nanning basin in Guangxi region

to China is 17-35 MN/m4; if pile diameter is larger

then to take a small value of m; if the buried depth is greater

then to take a larger value of m. The m values obtained by laboratory horizontal static load test and the numerical simulation calculation are very close

so as to provide reference for m value calculation in future. The factors affecting m

such as pile diameter

depth

concrete pouring “concrete irrigation quality

rock and soil water contents

lateral displacement

the amount of the load and long-term load

are analyzed.