抗滑桩变形监测及位移确定研究

针对抗滑桩深部变形监测中存在的问题，提出应用布里渊光时域反射计(BOTDR)技术监测抗滑桩深部变形及根据监测数据确定抗滑桩的位移。通过分析抗滑桩位移与其他物理量之间的关系，结合BOTDR监测抗滑桩应变特征，建立抗滑桩位移与应变之间的二次积分函数关系，并在假设基础上，给出边界条件和解析过程。通过对浙江省诸永高速公路红岩村I号滑坡抗滑桩BOTDR监测的实施及监测结果的计算，并与抗滑桩测斜监测结果对比，对基于BOTDR的抗滑桩位移确定计算模型进行了验证。研究结果表明：通过BOTDR技术监测抗滑桩的深部变形是可行的，抗滑桩的位移确定计算模型一定程度上能够满足工程需要，并且将光纤沿抗滑桩竖向受力钢筋布置，由其监测结果对位移进行计算较为准确。最后，对基于BOTDR技术确定抗滑桩位移的光纤铺设位置选取给出建议。本研究对推动BOTDR监测技术在抗滑桩以及相关桩基工程监测中的应用及数据使用方面具有参考和借鉴价值。

RESEARCH ON DEFORMATION MONITORING AND DETERMINATION OF DISPLACEMENT OF ANTI-SLIDE PILES

Aiming at the problems in the deep deformation monitoring of anti-slide piles，the Brillouin optical time domain reflectometer(BOTDR) technology is proposed to monitor deep deformation of anti-slide piles. Based on the monitoring data，the displacement is determined. Through the analysis of relationships between displacement and other physical quantities of anti-slide pile and the strain characteristics by BOTDR technology，the quadratic integral function relation between displacement and strain is established；and the analytical process and boundary conditions are given based on the hypotheses. Taking the anti-slide pile project of the landslide No.1 at Hongyan Village of Zhu-Yong Expressway in Zhejiang Province as the background，the optical fiber sensor and inclinometer are installed at different locations and the displacements are calculated based on the monitoring data. Comparing the calculation displacements with inclinometer monitoring results，the rationality of model for determining anti-slide pile displacement based on BOTDR monitoring data is verified. The results show that：BOTDR technology applied to monitor deep deformation of anti-slide pile is feasible；the model for determining anti-slide pile displacement can meet the needs of engineering to some extent；through arranging optical fiber along the reinforcement，the calculation displacements based on the monitoring data are more accurate. Finally，the locations of installing optical fibers for determining displacement of anti-slide pile based on BOTDR technology are recommended. The study has reference value for the application of BOTDR monitoring technology in anti-slide pile and relational monitoring and data processing in pile foundation engineering.