岩体与锚固体间粘结强度的确定

在预应力锚索设计参数的确定中，岩体与锚固体间粘结强度的确定是其十分重要的环节。现有的确定方法大多基于经验与现场试验的结合，费时费工，故有必要根据已有的试验资料确定一种定量方法。通过对国内30余例工程的统计分析表明，岩体与锚固体的粘强度不仅与岩石单轴抗压强度有关，还与内锚固段裂隙的分布与性质有关。通过室内外试验进一步建立了适合国内岩体质量指标确定的粘结强度经验公式与内锚段长度设计系数的图系，同时，也可为岩锚加固数值仿真提供经验判据。实例计算表明，所提供的确定方法与岩锚试验结果较为吻合。

Determination of cohesive strength between rock mass and anchors

It is important to determine the cohesive strength between rock mass and anchors in prestressed cable designing.But the commonly used methods,such as empirical method and in-situ experimentation cause vast investment in engineering.So,it is necessary to set a simple and useful method.Based on statistics of30anchor projects in China,the relationships was built of anchorage cohesive strength to compressive strength and the distribution and the structural property of structural plane in rock mass.It also can be used as a criterion in simulating the anchorage effects.In order to simplify designing of the length of grouted part for designers,a graphical system of designing coefficient was provided too.Finally,an example showed that results of this method have a good agreement with those of the in-situ test.