广西防城港那勤滑坡稳定性评价及防治对策

那勤滑坡位于广西南部低山丘陵地貌区，由破碎花岗岩及其风化产物构成。对该滑坡壁、滑坡床、滑坡体的结构特征及滑坡的拉张裂缝、滑坡洼地、醉林与马刀树等变形特征进行研究，结合滑坡形成的地质构造、地层岩性、地形地虢、气象水文等因素分析认为，该滑坡的形成过程专裂隙构造破坏花岗岩体的稳定性，形成易于脱离基岩的滚石；斜坡地形使其在重力作用下堆积于沟谷中，形成大小滚石及砂土杂乱堆积的滚石堆；雨水及地下水带走了堆积体内的砂土和细小滚石，使其成为空洞发育、大滚石相互支撑的滚石堆。风化及暴雨的冲刷作用，使滚石失衡、崩塌。在滑坡区中后部、坡度较陡的南、北两侧，形成塌陷洼地，在重力作用下诱发整个滑坡体，沿斜坡下滑。滑坡体的展布面积约由1．03万m^2，总体积1．6万m^3。采用传递系数法对滑坡的稳定性进行了定量计算及稳定性评价。得出，在饱水状态下，滑坡稳定性差，地质灾害危险性大。论文提出了设置排水工程、支挡工程、坡面防护、在空洞处灌浆以及人工炸石等治理和防护措施。

Stability analysis and harnessing countermeasure of Naqin Landslide in Fangchenggang, Guangxi

Naqin Landslide is located in the low hilly land. It is made of broken and weathered granite. The article studied on the structural characters of landslide wall, landslide body and deformation characters such as pull lack, tow-lying land, drunk woods and sabre trees . It clarified form process of Naqin Landslide as follows: At first, crack structure destroyed stability of structure of rock mass, forming rolling stones. The rolling stones accumulated in gully by gravity and formed rolling stone pile. Secondly, raining water and underground water took out sand and little rolling stone which accumulated in stone pile. Thirdly, stone pile lost balance and collapsed by weather and raining. The area of Naqin landslide is about 1000m~2 and the whole volume is 16,000m~3.On the basis of analysis on Naqin Landslide geographic and geologic conditions, landslide stability is evaluated under all kinds of conditions by using quantitative stability calculation ,and a synthetic prevention scheme is made, including anti-sliding, anchoring and bailing.