基于流固耦合原理的PFC2D颗粒流数值模拟程序,运用其内置FISHTANK函数库和FISH语言,分别定义流体域的流动方程和压力方程,对微生物灌浆过程中菌液在地层中的扩散过程和形态进行了数值模拟计算。通过调节PFC命令流中的注浆压力p、时步step、水力传导系数perm等参数对菌液的注浆过程进行了模拟计算。数值模拟计算表明,灌浆过程中菌液与地基土的作用形式与灌浆压力大小密切相关,过高的注浆压力会对地层结构造成一定的破坏。对钻孔周围土体的应力状态进行了理论推导和分析,理论推导结果与数值模拟结果相符。劈裂灌浆作用发生时,孔隙率和应变率均增加。 Based on the fluid-solid coupling theory, the PFC2D particle flow numerical simulation program is used to define the flow equation and pressure equation of the fluid field by using the built-in FISHTANK function library and FISH language. The diffusion process and morphology of the bacterial fluid in the formation during microbial filling are defined Numerical simulation. The grouting process of the bacterial liquid was simulated by adjusting the grouting pressure p, the step step, the hydraulic conductivity coefficient perm and other parameters in the PFC command flow. The numerical simulation shows that the interaction between the bacterial liquid and the foundation soil during grouting is closely related to the grouting pressure. Excessive grouting pressure will cause some damage to the strata structure. The stress state of the soil around the borehole is theoretically deduced and analyzed. The theoretical results are in good agreement with the numerical results. When splitting grouting occurs, the porosity and strain rate increase.