With the development of urban city scale

more and more refuse soil land is used to conduct engineering construction. Since the refuse soil has the characteristics of high compressibility

biodegradability

and fiber reinforcement

geotechnical engineering such as the cone penetration test

pressure-meter tests

static pile

etc.

will meet new challenges in this kind of site. Based on the modified Cam-clay model with fibrous reinforce considered and large deformation theory

through introducing an auxiliary variable

the cavity expansion issue is transformed to solve a set of first-order differential equations with given boundary conditions. The modified Cam-clay model is used to verify the accuracy of this research. Then the effect of over consolidation ration and fiber content to the solution is studied systemically. The results show that the refuse soil has a larger plastic radius compared with clay soil. With the increase of over consolidation ratio and fiber content

the inter cavity pressure and plastic radius show an increasing and decreasing tendency

respectively. After elastic and plastic stage

the refuse soil element with different fiber content reaches nearby the critical state of the paste component.