地下硐室锚注围岩的变形分析

地下硐室工程加固后围岩存在着继续位移。通过对工程实例的现场实测和大量测定结果进行统计分析，初步掌握了地下硐室工程破碎围岩加固后的岩体位移存在着方向变异性、破坏周期性和速度差异性。变形过程可分为急剧变形、调整变形和缓慢变形3个阶段。在一定的地压条件下，岩性和构造弱面决定着岩体位移的方向、速度和破坏周期。围岩加固后的位移在调整变形阶段可能改变位移方向，注浆加固岩层比未加固岩层的累计位移量小、但每次破裂的位移量大，破坏周期要短。及时锚注，滞后补注，分步加固是充分利用围岩自稳性，加强破碎围岩长期强度的最佳动态支护技术。

Analysis of reinforcing effect and distortion of subsurface-excavation with grouted rockbolts

This paper puts forward that the displacement of the reinforced cracked wall rock has variability in direction, periodicity of destroy and otherness of velocity variety, according to the whole process observation of convergence of the analysis of rock hole poly-point displacement. The process of distortion can be divided into three phases of the sharp distortion, regulative distortion and slow distortion. The paper indicates that the displacement of rock mass may change direction in regulative distortion phase; the displacement presents periodicity according to the storing and the destroy of the energy of rock distortion; the quantity of displacement of the top is more than that of the bottom; the quantity of displacement and the destroy periodicity of the terrain reinforced with cement injection are less than that of the unreinforced terrain, the convergence of boardrooms is the displacement of certain thickness wall rock of surface layer. The key technique is to consider fully the effect of faultage construct and to design the thickness of reinforced terrain and the form of closed shells according to the stress field.