Biocement as an alternative to cement for soil improvement has been studied for the past decade. A comparative study on the cementation effect on the mechanical behavior of sand by biocement and Portland cement is presented. Drained triaxial tests were carried out on both cement- and biocement-treated sand. The yielding of cemented sand is largely associated with the breakage of bonding. Bonding ratio is defined in this paper to quantify the bonding effect. The bonding provided by biocement is stronger than that by cement, and as a result, the stress ratio at yielding for biocement-treated sand is higher than that for cement-treated sand given the other conditions the same. The shear resistance of cemented sand consists of bonding, dilation and friction. The stress–dilatancy relationship of biocement-treated sand is different from that of cement-treated sand or the Rowe’s stress–dilatancy equation. The increase in stress ratio with dilatancy ratio (1 − δε_v/δε₁) is higher for biocement-treated sand.

在过去的十年中，已经研究了生物水泥作为水泥改良土壤的替代品。提出了生物水泥与硅酸盐水泥胶结对砂土力学行为影响的对比研究。在水泥和生物水泥处理过的砂土上进行了排水三轴试验。胶结砂的屈服主要与粘结的破坏有关。本文定义了键合比，以量化键合效果。生物水泥提供的结合力强于水泥，因此，在其他条件相同的情况下，生物水泥处理过的砂的屈服应力比高于水泥处理过的砂的屈服应力比。胶结砂土的抗剪强度包括粘结力，膨胀力和摩擦力。生物水泥处理过的砂土的应力-剪胀关系不同于水泥处理过的砂石或Rowe的应力-剪胀方程。应力比随膨胀率的增加（1- δε _v / δε ₁）可以biocement处理砂更高。