【摘要】 张家口伸缩仅受降雨干扰，不但与降雨量有关，而且与季节和降雨的方式等也有密切的关系。夏、秋季节持续或突降大雨后，两天左右引起应变量明显的变化，可用2．5倍毫米应变均方差，识别干扰和异常，有较大的使用价值。更多还原

【Abstract】 Zhangjiakou tensometer is disturbed by precipitation and seasons. In summer and autumn, the strain magnitude obviously varies in two days of raining, and the authors identificate the disturbance and anomaly by using 2. 5 multiple millimeter strain meansquare deviation.更多还原