锯齿结构面注浆剪切特性研究

Study on Shear Properties of Grouting in Sowtooth Structure Plane

为研究注浆对于结构面抗剪强度的影响,对注浆加固后的规则锯齿结构面进行剪切试验,研究不同锯齿个数时,结构面所受法向荷载与抗剪强度的定量关系。根据试验结果,阐述了规则注浆锯齿面破坏时的特征。结合莫尔库伦理论,分析影响结构面抗剪强度的相关因素以及锯齿个数对相关因素的影响。通过与普通规则锯齿结构面剪切试验进行对比,进一步说明注浆对结构面抗剪强度的影响。建立单锯齿剪切力学模型,分析顺逆剪面破坏特点,最终建立了规则注浆锯齿结构面的抗剪强度经验公式。研究结果表明:规则注浆锯齿结构面的抗剪强度随锯齿个数的增加而增加,在不同正应力下,注浆锯齿结构面会出现粘接失效,爬坡效应,剪断效应三种基本现象。单个锯齿顺逆剪面破坏与施加的荷载大小和位置有关。结构面进行注浆加固之后,其抗剪强度有明显的提高。

In order to study the effect of grouting on the shear strength of structural plane,shear test on the regular dentate structural plane of grouting reinforcement is carried out. The quantitative relation between normal load and shear strength of structural plane is studied with different number of sawtooth. According to the experimental phenomena,failure characteristic of sawtooth surface was described. Combined with Mohr- Coulomb theory,correlation factors of shear strength and the influence of sawtooth number on the relative factors were analyzed. By comparing with the shear test of the common regular sawtooth structure,effect of grouting on shear strength of structural plane is further explained. A single sawtooth shear mechanical model was established to analysis failure characteristics of shear surface and inverse shear surface. At last,a shear strength empirical formula of regular dentate structural plane of grouting reinforcement is established. The results show that shear strength increases with the increase of the number of sawtooth. Under different normal stress,the grouting saw tooth structure may appear three basic phenomena,including adhesion failure,climbing effect and snipped effect. The failure of a single sawtooth is mainly related to the load and position of the applied load. After grouting reinforcement,the shear strength of structure is improved obviously.