膨胀土开挖边坡裂隙面产状数字量测方法研究

Research on digital measurement method for fissure structural plane occurrence of excavated expansive soil slope

由于南水北调中线膨胀土开挖边坡裂隙结构面具有不易分辨且纹理模糊的特殊性,采用现有的数字地质编录技术费时费力,且增加人工选点误差,导致量测不准确。提出通过在膨胀土开挖边坡裂隙结构面上摆放L形标定板,结合基于SIFT的图像匹配技术与椭圆拟合的标志点检测技术自动获取同名点,最后利用空间垂直关系得到裂隙结构面的产状。南水北调中线的两段工程实验表明,该方法能够快速准确地量测裂隙结构面产状。

Due to the particularity of difficult identification and indistinct texture of the excavated expansive soil slope fissure structural plane in Middle Route Project of South to North Water Diversion, the present digital logging method requires time-consuming effort and increases the errors of manual point selection, resulting in inaccuracy measurement. We put forward a oc-currence analysis method, i. e, setting a L-type calibration plate on the fissure structural plane of the excavated expansive soil slope, automatically determining corresponding points by SIFT-based image matching technology and ellipse fitting-based mark point finding technology, and obtaining the fissure structural plane occurrence by spatial perpendicular relation. The engineering practices in 2 sections of Middle Route Project of South to North Water Diversion show that this method is feasible and can measure the fissure structural plane occurrence quickly and accurately.