The tunnel portal earth pressure is divide into two parts at tunnel lining height, the earth pressure intensity-formula at upper part, below part, general earth pressure formula and earth pressure action point formula are derived.

• 以隧道衬砌的高度为界，将隧道洞门土压力计算分为上、下两部分，推导出上部上压力强度、下部土压力强度、总土压力及土压力作用点的计算公式。