一种新型综合注浆加固试验系统的研制及应用

Development and application of a new comprehensive grouting reinforcement test system

针对现有注浆加固试验装置难以平衡高压注浆所需密封效果和多功能试验所需空间结构的缺点,研制了一套新型多功能综合注浆加固试验系统.该试验系统的优点为:(1)尺寸适中、结构合理,既具有布设监测元件的试验空间又具有良好的密封效果;(2)适用范围广,可针对不同岩土体介质开展多类注浆加固试验;(3)具备多元物理信息并行采集功能;(4)可同时满足加固体宏观物理力学性质测试及浆-岩界面微观耦合机制的研究需求.该系统成功应用于断层角砾介质注浆加固室内模拟试验,分别从应力响应-传递特征、加固体强度增长规律及加固模式等方面探究了断层角砾介质的注浆加固机理,提出了角砾介质强度增长的经验公式,揭示了加固过程中注浆压力的传递分配机制.

Existing grouting test devices have difficulty providing sufficient sealing effect and experimental space in multifunctional tests. Due to the limitations of current devices,this paper developed a new comprehensive grouting reinforcement test system. The major advantages of this system include：（ 1） its moderate size and reasonable structure that offer a large experimental space and good sealing property;（ 2） its ability to simulate the different groundwater environments and grouting conditions of rock soil media;（ 3） its ability to obtain a variety of physical information for researching the space-time response law of reinforcement parameters; and（ 4） its ability to simultaneously test the compressive and shear strengths of the solid and microscopic grouting coupling mechanisms of the slurry-rock interface. An orthogonal grouting reinforcement test was designed for fault breccia using the new device. The study then investigated the grouting reinforcement mechanism of fault breccia with respect to the stress response-transfer characteristics,the growth law of solid strength,and the reinforcement mode. The test results show fault breccia to be mainly reinforced by permeation grouting and the grouting reinforcement model can be divided into three types—substrate,micro-splitting,and significant splitting. The study achieved an increase in the strength of grouting reinforcement bodies by changing the medium connection mode and fitted the empirical formula for the increased strength of solid grouting. It also determined the distribution and transfer mechanism of grouting pressure.