新型可回收锚杆不同布置间距的群锚效应

为了分析在岩土体中新型可回收锚杆的布置间距对锚固特性的影响规律,根据Kelvin解,推导了锚杆按不同间距布置时锚固段剪应力求解公式;采用一般岩土体参数对锚固段剪应力分布进行了计算;建立了按不同间距布置时该可回收锚杆的三维有限元加固模型,并进行了数值计算,验证了理论分析的正确性.结果表明:推导的锚杆按不同间距布置时锚固段剪应力求解公式的计算结果与数值模拟结果相符;在岩体中锚杆布置间距对锚固特性影响不大,而在土体中锚固特性受锚杆布置间距影响较大,锚杆布置间距越小,锚固段剪应力峰值越小,在实际工程施工中应特别注意.

Effects of the new type of recoverable anchor groups with different disposing spacings

In order to analyze the effects of disposing spacing of the new type of recoverable anchor groups on the anchoring properties, the formulas for the shear stress along the anchoring section with different disposing spacings were first deduced based on Kelvin' s solution. Then, the distribution of shear stress along the anchoring section was calculated using the general parameters of rock and soil. Finally, three-dimensional finite element consolidation models for the new type of recoverable anchor groups with different disposing spacings were established, numerical simulations were conducted, and the correctness of the theoretical analysis was validated. The results indicate that the results calculated with the proposed formulas are in agreement with those of the numerical simulation. The effect of different disposing spacings in rock on the anchoring properties is very small, but in soil it is very large. As the disposing spacing is reduced, so is the peak value of the shear stress along the anchoring section. This should receive special consideration in project construction.