抗滑桩内力的监测与计算

Monitoring and calculation of anti-slide piles internal force

抗滑桩已广泛应用于滑坡治理,但是对抗滑桩的监测研究还不够深入。通过测斜管监测抗滑桩的侧向位移,在文克勒弹性地基梁模型的基础上计算得到锚固段地层抗力,再运用力学平衡原理计算滑坡剩余下滑力值。对抗滑桩不同部位钢筋的受力进行监测,可求得各个截面处的弯矩。假设滑坡剩余下滑力的分布函数为一个二次多项式,由监测求得的滑坡剩余下滑力值和抗滑桩各截面弯矩,分析计算可得到该二次多项式。在求得抗滑桩所有作用力以后,就可以计算得到抗滑桩的弯矩和剪力分布图。与设计阶段采用的抗滑桩弯矩和剪力进行比较,就可以知道抗滑桩的抗滑效果,并为改进抗滑桩的设计提供依据。

The anti-slide pile has been widely used in the treatment of landslide, but research on the monitoring of the anti-slide pile is not intensive. Based on the model of Winkler elastic foundation beam, the reacting force of the rock can be educed from inclinometer reading, and then residual landslide thrust on anti-slide pile is estimated using mechanics equilibrium principle. Monitoring the stress of reinforcing steel bar, the moment of the section where setting the strain gauge can be obtained. Assumption that the distribution function of the residual landslide thrust is a quadratic polynomial function, we can obtain the function based on the calculation results. Once we ravel the loads of the anti-slide pile, we can deduce its moment and shear diagram. Compared with the designed value of internal force, we can infer the effect of the anti-slide pile, and this can supply evidence for the further treatment of landslide.