摘要
为研究施工扰动和强降雨浸透影响下的地层变形演化特征,采用通用离散元程序(UDEC),开展不同降雨强度及不同开挖深度组合下地表沉降特征的模拟研究,探索开挖过程中的地表孔隙水压力及位移场分布规律。结果表明:随着开挖深度的增加,孔隙水压力逐渐减小,而土层的沉降量明显增加,且两者均受监测点与开挖位置之间距离的影响;降雨条件下土层的沉降量易受开挖工况的影响,靠近土体上层的土质(如杂填土及碎石填土,黏性土和砂土等)在开挖后产生的沉降量变化相似,下层的土体(如构造破碎带)相对发生沉降量较小;此外,上层土体的性能松散,透水性较好,具有较大的变形特性,所以,降雨入渗会增加上层土体的沉降量。
In order to study evolution characteristics of strata deformation under influence of construction disturbance and heavy rainfall infiltration,simulation research was conducted on features of surface subsidence under different rainfall intensity and excavation depth by using universal distinct element code(UDEC).Then,distribution law of surface pore water pressure and displacement field during excavation was explored.The results show that along with the increase of excavation depth,pore water pressure decreases gradually while settlement of soil layer increases obviously,both of which are affected by distance between monitoring point and excavation position.Soil settlement,in the event of rainfall,is easily affected by excavation conditions as settlement of soil near upper layer(such as mixed fill and gravel fill,clayey soil and sand etc.)is similar after excavation,and that of lower soil(such as structural fracture zone)is relatively small.It is also found that rainfall infiltration increases settlement of upper soil which features loose properties,good permeability and greater deformation characteristics.
作者
肖晓春
唐倩
徐军
吕祥锋
XIAO Xiaochun;TANG Qian;XU Jun;LYU Xiangfeng(School of Civil Engineering,Shaoxing University,Shaoxing Zhejiang 312000,China;Key Laboratory of Rock Mechanics and Geological Disasters of Zhejiang Province,Shaoxing University,Shaoxing Zhejiang 312000,China;School of Civil and Resource Engineering,University of Science&Technology Beijing,Beijing 100083,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第2期133-139,共7页
China Safety Science Journal
基金
国家自然科学基金资助(51974186,51774164,51774048)。
关键词
开挖深度
孔隙水压力
降雨强度
土体特征
沉降量
excavation depth
pore water pressure
rainfall intensity
soil characteristic
settlement
