软土地区基坑开挖降水对运营高铁路基的影响分析  

ANALYSIS OF INFLUENCE OF FOUNDATION PIT EXCAVATION AND DEWATERING ON SUBGRADE OF OPERATING HIGH-SPEED RAILWAY IN SOFT-SOIL AREA

作　　者：方浩[1,2] 方磊[1,2] 童立元[1,2] 

机构地区：[1]东南大学岩土工程研究所,南京210096 [2]江苏省城市地下工程与环境安全重点实验室,南京210096

出　　处：《建筑技术》2017年第9期968-971,共4页Architecture Technology

基　　金：国家自然科学基金项目(41572273);十二五国家科技支撑计划项目(2012BAJ01B02)

摘　　要：针对软土地区某邻近运营高铁路基的基坑工程,采用有限元方法建立包含基坑及高铁路基在内的三维分析模型,研究基坑开挖降水对高铁路基的影响规律,结果表明当坑底存在较厚且土质较差的淤泥质粉质粘土层时,围护墙最大侧移发生在1.5倍开挖深度处;基坑开挖降水引起的地表沉降影响范围达到了6.5倍开挖深度;路基纵向沉降和水平位移的影响范围明显超过了基坑边界范围。According to a foundation pit excavation project adjacent to an operating high-speed railway in soft soil area, using the finite element method, a three-dimensional analytic model incorporating the foundation pit and the subgrade of the nearby high-speed railway has been built, and thus the regularity of how foundation pit excavation and dewatering influence the subgrade of the high-speed railway has been studied. The study shows that when there is a thick very soft silty clay layer of poor-quality soil under the foundation pit, the maximum lateral displacement of the retaining wall occurs at a depth of 1.5 times the depth of excavation. The distance of influence of excavation and dewatering, within which ground surface settlement can be induced, reaches 6.5 times the depth of excavation. The part of the subgrade within the distance of influence of excavation and dewatering where longitudinal settlement and horizontal displacement of the subgrade are induced is much larger than the part of the subgrade that is between the extended transverse boundaries of the foundation oit.

关 键 词：高铁路基 软土地区 沉降 基坑开挖降水 

分 类 号：TU463[建筑科学—结构工程]