CAJ | 학술논문

针对深圳光汇油库边坡由于连续强降雨导致的滑坡,分析该滑坡形成的原因和工程治理方案.现场勘查结果表明,滑动面处于顺坡向陡倾角的强～中风化接触面上,在强降雨条件下,部分下渗的降雨在岩土分界面上汇流,渗流强度加大,黏性颗粒大量流蚀,致使黏聚力值急剧下降,削弱岩土体的整体强度并导致滑坡的产生.根据该边坡的滑坡体结构特征反算滑动面的强度指标,结果表明黏聚力在饱水状态后的大幅度衰减与预先的分析是吻合的.在保持岩土参数不变的情况下,讨论软弱面坡度变化对稳定性的影响规律,认为二者之间并非呈单调变化的关系.考虑到坡脚的大型油罐和坡顶高压电塔的破坏后果很严重,采用抗滑桩加锚索的分级支护体系并基于计算分析确定支护参数.监测结果证明在后续强降雨条件下变形稳定,治理效果良好.上述分析和治理方法为类似强降雨条件下高危边坡的工程治理提供参考经验.
침대심수광회유고변파유우련속강강우도치적활파,분석해활파형성적원인화공정치리방안.현장감사결과표명,활동면처우순파향두경각적강～중풍화접촉면상,재강강우조건하,부분하삼적강우재암토분계면상회류,삼류강도가대,점성과립대량류식,치사점취력치급극하강,삭약암토체적정체강도병도치활파적산생.근거해변파적활파체결구특정반산활동면적강도지표,결과표명점취력재포수상태후적대폭도쇠감여예선적분석시문합적.재보지암토삼수불변적정황하,토론연약면파도변화대은정성적영향규률,인위이자지간병비정단조변화적관계.고필도파각적대형유관화파정고압전탑적파배후과흔엄중,채용항활장가묘색적분급지호체계병기우계산분석학정지호삼수.감측결과증명재후속강강우조건하변형은정,치리효과량호.상술분석화치리방법위유사강강우조건하고위변파적공정치리제공삼고경험.
A serious landslide occurred in a slope in Shenzhen due to the continuous rainstorms. The landslide generation mechanism is studied and the treatment scheme is discussed accordingly. Based on the investigation information,the slip surface is found in the contact interface between highly and medium- decomposed marble. The contact materials have become saturated due to rainwater infiltration. And most cohesive particles are washed away by the infiltrated rainwater flow. The serious lost of cohesion,thereby,has weakened strength of the entire slope body and caused a landslide. The numerical model is established for back analysis according to the slope characteristics and the compution values of strength parameters have also confirmed the cohesion reduction due to rainwater infiltration. In addition,discussions are conducted on the influence from different contact interface angles to evaluate the slope stability. The correlation between the contact interface angle and the calculated factor of safety do not tend to be monotonous,which would be an important factor affecting the slope stability. The slide-resistant piles with anchors are applied as the new reinforcement design to prevent the slope failure in consideration of the importance of oil tanks and power transmission tower adjacent to the slope. The information monitored after several heavy rainstorms shows that the slope deformation has been well controlled. It is approved that stability of slope has been improved and the landslide is well treated. Some experiences from this project can be referred for slopes stability analysis and treatment design under similar rainstorm conditions.