云—应盆地薄层复层岩盐矿水采区地面沉陷机理研究

MECHANISM OF SURFACE SUBSIDENCE OF THE THIN AND MULTI-LAYER STRATIFORM ROCK SALT DEPOSIT IN HYDRAULIC EXPLOITING AREA,YUN-YING BASIN

在高分辨率地震、电测深、声波测井和钻探采取岩土样试验的基础上,分析了云—应盆地薄层复层岩盐矿水采区地面沉陷的诸多影响因素。认为采卤井断裂或穿漏和生产井停产或突然卸压是导致地面沉陷的主要因素,其沉陷模式为潜蚀破坏—自重沉陷—固结压密。

Rock salt lode in YunYing Basin is a mured shallow and limonitic sedimentation thin and multilayer stratiform deposit.Hydraulic splitingsoluting exploiting has found that there are two great scale surface subsidences and surface fissures;that caused construction damage at 100 and more ground solutive places.According to seismic prospecting,electronsound,sonic log,drilling,and rock sample testing,the paper explains the affective factors mechanism of the subsidences in hydraulic exploiting area,based on the statistical analysis and research of all results.The research shows: ①The factors causing the surface subsidence are the fissures or corrosive leak of well pipes, and a sudden halt or abrupt dispersing of the saline well;②The mechanism model of surface subsidence is the erosion-gravity subsidence-compaction.