中文摘要：

光纤传感技术是滑坡监测领域较新的方法，通过在白水河滑坡前缘采用定点固定加直接埋设的方式并行布设应变式光纤和温度补偿式光纤，开展地表变形监测。根据PPP-BOTDA分布式光纤理论，对应变式光纤和温度补偿式光纤的应变数据进行温度补偿处理，得到光纤因变形而引起的实际应变。利用巴特沃斯低通滤波去噪方法，比较4组不同采样频率下的滤波效果及残差，确定滤波器阶数”和截止频率％。为表征2次监测数据之间的差异，选取光纤2次监测曲线与固定横轴的面积差作为评判指标，获取光纤沿线面积差，得到面积差与光纤应变筹异程度之间为正相关关系，同时与野外实测数据进行对比分析。结果表明，采用PPP-BOTDA技术进行滑坡地表变形监测时，利用巴特沃斯滤波器进行去噪处理，并采用应变面积差表征光纤应变差异程度的分析结果，与野外空间地理位置上吻合度较高，对光纤技术在滑坡监测中的应用具有一定的借鉴意义。

英文摘要：

The object of monitoring lies in the anterior part of Baishuihe landslide. In the deformation monitoring, the PPP-BOTDA distributed optical fiber sensor technology is adopted. The information captured by the device is the strain caused by sliding mass. Two optical fibers, the temperature fiber optic sensor and the strain optical fiber sensor, are buried under the surface of the landslide. For the oscillation of the three groups of monitoring data, the Butterworth low-pass filter is particularly designed to minimize the influence of the noise signals; and the comparison among the four groups of different sampling frequencies were conducted to reveal the most suitabJe value of the n and the Wn. Then the area difference between the curve and the horizontal axis along the optical fiber line is utilized to make quantitative evaluation of the strain. The findings show that the method of the Butterworth low-pass filter and the area difference value is helpful to indicate the difference of the strain. It is proved to be effective according to the in-site observation. The results present that it is of reference value for the fiber optic sensing technology applying in the landslide monitoring.