某井场高填方边坡变形机理及稳定性评价

研究井场为九龙沟内一预探井,由于井场地处斜坡区,为保持场地平整,在前期施工进程中进行了大量的挖填方工程;为保证高填方边坡的稳定性,已在填方区前缘修筑"T"型重力式挡墙。但在后期施工过程中,场区坡体及挡墙等建筑物出现拉张裂缝,变形迹象明显,具有较大危险性。本文根据场区变形迹象分布规律,结合场地地形、建筑物分布及其受影响程度等,对场地进行了分区并详细描述了各区工程地质特征;在此基础上,根据填土特征及原始坡体物质结构特征,对场区变形机理及稳定性影响因素进行了分析;最后采用极限平衡法对各区整体及局部稳定性进行了计算,计算结果为分析场区坡体稳定状况及预测可能造成的工程危害性提供了评价基础。

DEFORMATION MECHANISM AND STABILITY OF HIGH FILL SLOPE IN SOME WELL SITE

Some well site is a preliminary prospected well in Jiulong valley,due to the well site located at the slope area,in order to maintain the site formation,a large number of excavations and filling have been carried out in the pre-construction process.In order to ensure high slope stability,the type retaining wall has been constructed in front of the slope.But in the latter stage of the construction process,field area slope and retaining wall appear a series of tension cracks.Because of obvious signs of deformation,the well site is at risk.Based on the signs of deformation distribution,site topography,building distribution and the affected level,it divided the well site into three zonings and described every zoning engineering geological feature.On this basis,combined with the features of fill section and structure characteristics of original slope,it discussed the causes of the talus slope and deformation mechanism of the future,mainly focused on the trigger factors which impacted on the stability.Finally,it evaluated on the whole accumulation as well as the local stability of every zoning using the limit equilibrium method.This provided evaluation foundation for analyzing the stability of the well site slope and predicting the consequences of the engineering harm caused by the instability of the slope.