隧道泥质断层多序注浆动态劈裂扩散规律

注浆方法是加固隧道泥质断层的有效手段，为解决多序注浆产生劈裂压力和劈裂路径宽度的计算问题，揭示多序注浆之间的动态影响规律，为注浆设计提供理论指导，采用理论推导和模型试验方法开展研究，旨在推动劈裂注浆工程设计向科学化和可控化发展。泥质断层劈裂注浆工程中，建立合理的土体应变ε-应力p曲线模型是进行注浆设计参数（压力、劈裂路径宽度）计算的基础，注浆具有多序次特点，先序注浆的加固作用使得土体ε-p曲线模型具有动态性，进而导致浆液劈裂扩散模型的动态性。在土体初始压缩的基础上，以先序固结压力p_c和再压缩土体特征压缩模量E'_s1-2为表征参数，提出了适用于后序注浆中被注土体再压缩变形的ε-p曲线模型及其参数求解方法，进而建立了再压缩土体浆液劈裂扩散模型，与采用初始压缩土体浆液劈裂扩散模型相比，所取工况下劈裂路径宽度计算值降低幅度最高可达26.59%，浆液驱动压力计算值提升幅度最高可达269%，证明了考虑先序注浆影响的必要性。开展了"三管四序次"可识别性劈裂注浆模型试验，分别对比第1，2序和第2，3序注浆，后序最大注浆压力提升96.4%和5.45%，平均注浆压力提升104.8%和20.16%。此外，后序注浆劈裂路径宽度相比先序降低了58.2%~69.3%，验证了理论推导结果的正确性，试验还监测了可反映浆液对于被注介质的"加固行为"的土压力变化规律以及浆液劈裂路径的三维分布形态。

Dynamic Fracturing Diffusion Law Considering the Influence of Multiple Sequence Grouting in Argillaceous Fault

The grouting method is an effective method to reinforce argillaceous fault in tunnel engineering. By using the theoretical derivation and model test methods, this study aims to realize the calculation of pressure and splitting path width of multiple sequence grouting in argillaceous fault, also to reveal the dynamic influence law among them. In this way, the development of scientific and controllable grouting can be promoted. In the engineering of fracturing grouting for argillaceous fault, establishing a reasonable ε-p curve model of soil was the basis of the calculation of grouting design parameters (pressure, splitting path width). The grouting process had the characteristic of multiple sequences and the pre-sequence grouting reinforcement effect could make the soil ε-p curve model with dynamic character, and then the slurry split diffusion model also had the dynamic performance. On the basis of initial soil compression, the pre-consolidation pressure p and the recompression soil characteristic compression modulus E'_s1-2 were regarded as the characterization parameter, and put forward the order sequence was applicable to the grouting in the soil recompression deformation ε-p curve model and its parameter solving method, and then the recompression soil slurry split diffusion model was established. Compared with the initial compression soil slurry split diffusion model, the calculated value of the split path width was reduced by up to 26.59% under the working condition, slurry drive pressure to enhance the value of the maximum increase of up to 269%, which proved that the necessity of the first sequence grouting was considered. The model test of identification of "three tube four order" fracturing grouting test was carried out. Comparison of the results of the first order and the second order test show that the maximum and average injection pressure can increase by 96.4% and 104.8%, respectively, while they become 5.45% and 20.16% in the second order and the third order test. Furthermore, the average width of the post grouting split path was reduced by 58.2%-69.3% compared to the first order, which fully proved that the correctness of the theoretical results. The changes of soil pressure and the three-dimensional distribution of the slurry splitting path also can be monitored by the experiment.