骆建文　李茜

【摘要】根据现场调查访问，滇西某滑坡在每年雨季和耕种期间，坡体上的田坎有不同程度的垮塌，滑坡前缘出现滑塌，特别是在地势较陡峭的地段。为更深入认识滑体变形破坏机理，进一步评价和预测滑坡在天然工况以及暴雨工况下的稳定性，利用FLAC3D进行数值模拟，分析滑坡的应力场、剪应变增量以及塑性变形区。结果表明：在暴雨工况下，滑坡剪应变增量相比天然工况下出现明显的贯通，贯通基本沿着滑坡体上的含碎石粉质粘土底部由上向下贯通，塑性区相比天然工况下分布范围扩大，塑性区主要分布于含碎石粉质粘土层底部，模拟结果的剪应变增量贯通区以及塑性分布区与钻探揭露推测的滑动面相一致。由于剪应变增量基本贯通整个坡体，塑性区分布范围也比较大。（不要可以吗）。

【关键词】裂缝；水文地质；数值模拟分析；FLAC—3D模型お

Application Of The FLAC3D In Landslide In The western Yunnan

Luo Jian—wen1， Li Qian2

（1 Xi''an Changqing Technology Engineering limited liability CompanyXi''anShaanxi710021；

2 Shaanxi Engineering Research Center of RiverXi''anShaanxi710018）

【Abstract】According to the field investigation， in the rainy season every year and the period of farming， the ridge of the landslide has a different degree collapse， The landslide front appears slumping， especially in the steep section. For the more thorough understanding of landslide deformation mechanism and further evaluation and prediction the stability of landslide under natural condition and the rainstorm condition，it analysed the stress field、the shear strain increment and the plastic deformation zone of landslide by using FLAC3D numerical simulation， The result showed： in storm conditions， landslide shear strain increment， compared with the natural conditions， appeared obvious connection which substantially along the pebbly silty clay bottom by penetrating； plastic zone distribution scope was larger than that of the natural conditions， the plastic zone was mainly distributed in the pebbly silty clay layer bottom.， the connection zone of the shear strain increment and the plastic zone distribution area by the simulation results were consistent with the sliding surface of the drilling hypothesized. Due to shear strain increment running through the whole slope， plastic zone distribution range was relatively large.

【Key words】Crack；Hydrogeololgy；Numerical simulation analysis；FLAC3D modelお

1. 工程概况

滇西管道在云南省龙陵县腊勐乡松山村顺勐梅河右（南）岸斜坡敷设，所在之处发育有大型土质滑坡，管道从滑坡区中右部与主滑方向小角度相交敷设通过，滑坡滑动对拟敷设的管道施工及运营构成较大的威胁，特对该滑坡进行专项勘查，并运用FLAC—3D软件对该滑坡进行建模分析。

2. 地形地貌

（1）场地地貌属于低山区沟谷斜坡区，河谷横断面呈敞口的“U”字型，河床区地形较开阔平缓滑坡位于勐梅河右（南）岸（图1）。

图1滑坡区地形地貌

（2）滑坡位于近南北向延伸的斜坡上，地势南高北低，场地内地面标高766m～860m，相对高差近100m，滑坡主滑方向359°。……