深圳市景亿山庄滑坡特征及成因分析

根据现场工程地质调查和勘察,论文深入分析了景亿山庄滑坡的变形特征、性质、变形机制,并探讨了滑坡的成因。指出在具有剥蚀残丘地貌特征的场地开挖以砂岩残积物为主要组成物质的边坡时,边坡高陡是造成边坡变形破坏的主要因素。长时间的持续降雨是诱发因素。对于陡倾原生节理裂隙发育的土质和类土质边坡,滑坡周界受边坡体内原生节理裂隙控制,滑坡后缘常沿该陡倾的节理裂隙发育。在深圳等降雨量大的亚热带气候区,若坡体内没有不利于边坡稳定的各种结构面,当边坡开挖高度不超过20m,总体坡率不陡于1∶1时,边坡能够保持短期稳定。但长期稳定性受当地降雨量和降雨强度的控制,开挖后若不采取适当的加固措施,易发生滑坡等浅层病害。其病害从孕育到发生可持续长达10a之久。通过论文的研究,可供在类似地区开挖边坡、整治边坡病害借鉴。

Analysis on the characteristic and formation mechanism of landslide in the Jingyi residence zone

The characteristic,property,and mechanism of deformation are analyzed for the landslide in the Jingyi residence zone on the basis of the geological investigation and survey.Moreover,the formation mechanism is discussed.It is found that making the slope higher and steeper is the reason for the occurring and development of the landslide.In the meanwhile,the long-term and continuous rainfall is the crucial inducing factor.The boundaries of the landslide,which occurred in the soil or soil-like material slope with joints and fissures,are developed on the existing high-angle joints and fissures.The cutting slope,which is not higher than 20m and not steeper than 1:1 in the general gradient,in which there exist no disadvantage tectonic planes,will be stable on short term in such subtropical zone with high rainfall as Shenzhen.But the everlasting stability of the cutting slope will be affected by the rainfall and rainfall intensity.Some shallow slope failures will happen if the protect and control measures aren't taken.And the course of deformation will last for more than ten years.In this article,some conclusions may be helpful for cutting slope and controlling slope failure in similar areas.