水泥浆液裂隙注浆扩散规律模型试验与数值模拟

普通硅酸盐水泥浆液作为岩土工程注浆中最为常用的浆材，其静水与动水条件下的注浆扩散运移规律是目前研究的重点。通过模型试验和数值模拟系统研究水泥浆液在静水和动水条件下平面裂隙中的扩散规律；基于流体动力学理论，分析和验证水泥浆液在地下水影响下的扩散形态及压力场分布特征；通过对比模型试验和数值模拟数据，分析水泥浆液在静水和动水条件下的运移和扩散机制。研究结果表明：动水条件下浆液扩散开度和逆水扩散距离存在极限；浆液压力场分布为自注浆孔沿扩散方向迅速衰减，注浆孔附近压力衰减速率最快，逆水方向压力衰减速率明显大于顺水方向。并据此对传统注浆工艺提出改善建议。

DIFFUSION LAW MODEL TEST AND NUMERICAL SIMULATION OF CEMENT FRACTURE GROUTING

Ordinary silicate cement grout is one of the most commonly used grouting materials，of which transport and diffusion laws have become one of focus of geotechnical engineering fields. Diffusion laws of cement grout in planar fracture were researched systematically by model experiment and numerical simulation. Based on the theory of fluid dynamics，action mechanism of the grout diffusion patterns and pressure distribution laws influenced by movement of groundwater were analyzed. Through comparing the experimental and numerical simulation data，the transport and diffusion mechanism of cement grout in the hydrodynamic and hydrostatic conditions were studied. According to the study results，under the hydrodynamic condition，pressure of cement grout decreases rapidly from the grouting hole；and the pressure decreases extremely at the direction opposite to water flowing. At the same time，there are limits of diffusion space and distance opposite to the water flowing direction. Some suggestions were put forward to improve traditional grouting techniques.