琼北开挖土坡的稳定性评价与防治对策

Stability Assessment of the Excavated Soil Slope in North Hainan

琼北丘陵地区一土坡已被开挖形成高约8m近于垂直的陡坎,坡体下居民20户,台风来袭时,可见坡体变形破坏,为查明边坡是否存在潜在的安全隐患和是否影响居民的生命财产安全,需对其进行稳定性的分析与评价.通过野外地质调查和室内土工试验,采用Geo-Slope软件中的Slope/W模块,在天然与台风2种不同工况下,对该土坡的稳定性展开了计算与分析,结果表明,该土坡在天然工况与台风工况下对C种台风雨的稳定性良好,A与B2种不同类型的台风雨对坡体的影响明显,使其处于临稳状态.影响该土坡稳定性的因素主要是高强度台风雨,其中,最危险的潜在破坏面为第四系覆盖层与下伏基岩全风化层的接触界面交界处,剪出口最可能位于土体临空面和基覆界面处,建议及时地采取防范措施.

In north Hainan,a slope of hilly region has been excavated and a vertical scarp about 8 meters high was formed,under which there are 20 families.When the typhoon hit,the visible slope deformation is observed.In order to figure out whether there are potential safety hazards threatening the safety of people＇s life and property,the stability analysis and evaluation of the slope are necessary.In the study,the geological field work and laboratory geotechnical test were performed and Slope / W module of Geo-Slope stability calculation software was used to analyze and calculate the stability of the slope under natural and working condition.The results showed that under natural and C typhoon conditions,the slope has good stability,however,under the influence of the typhoon rain of A and B type; it is in a critical stable state.The main factor influencing the slope stability was high intensity storms; the most dangerous potential failure plane is the interface on the border between quaternary overburden and the underlying fully weathered rock strata,shear opening is most likely to locate at the soil body and the interface between the quaternary overburden and the underlying weathered rock strata.So,the necessary precautionary measures should be prepared.