Experimental Study on the Strength Characteristics of Expansive Soils Improved by the MICP Method

Microbially induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties; however, there are few literatures about the application of MICP strength characteristics expansive soils with low permeability. In this paper, series CD triaxial tests were carried out investigate effect on soils. The results show that shear specimens increased increase in cementation solution and eventually reached stable value. can significantly index cohesion was from 29.52 kPa 39.41 kPa, internal friction angle 20.13° 29.58°. stress-strain curves soil samples improved by hyperbolic relationship, which is characterized strain hardening. model chosen describe relationship method, predicted good agreement measured results. Moreover, we performed scanning electron microscope (SEM) experiment revealed mechanism conclusions above provide theoretical basis further study method.