安康地区膨胀土滑坡的成因机理分析

The study of causes and regularity on expansive soil slope of Ankang

膨胀土滑坡是一种常见的地质灾害。本文根据安康地区膨胀土滑坡地质灾害调查结果，结合膨胀土的特点，发现安康地区膨胀土滑坡多数属于牵引式滑动，大多数在6m以下，且具有明显的季节性和间歇性规律。分析认为，安康地区膨胀土滑坡滑动的根本原因就是坡体存在裂缝。裂缝的发展是一个长期过程，其发展受到干湿循环的影响，只有裂缝达到足够的深度膨胀土滑坡才会产生。

The expansive soil slope is a common geological disaster. It was found that the Ankang expansive soil landslide always represent traction sliding which mostly below 6m and have obvious seasonal and intermittent rule according to its characteristics and the geological disaster survey of expansive soil slope in Ankang. The basic reason of Ankang expansive soil landslide was the existence of fracture whose development was a long-term process influenced by drying and wetting cycles. The expansive soil landslide can take place only by the adequate depth of the crack.