岩土力学参数的空间变异性对地面沉降的影响  

Influence of spatial variability of geotechnical mechanical parameters on land subsidence

作　　者：高燕 吴晓东 田嘉逸 GAO Yan;WU Xiaodong;TIAN Jiayi(School of Earth Sciences and Engineering,SunYat-sen University,Zhuhai 519082,Guangdong,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,Guangdong,China)

机构地区：[1]中山大学地球科学与工程学院,广东珠海519082 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082

出　　处：《隧道与地下工程灾害防治》2023年第1期18-31,共14页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金资助项目(42072295);广东省创新创业团队资助项目(2017ZT07Z066)。

摘　　要：基于随机场理论、有限元数值分析与Monte-Carlo随机模拟方法,研究岩土参数的空间变异性对地面沉降的影响。以内摩擦角和弹性模量空间变异性为重点,系统研究内摩擦角和弹性模量随机场的变异系数、水平和竖向相关距离对地面沉降的影响。结果表明:变异系数越大,地面沉降曲线分布的离散程度越高;对比确定性分析结果,考虑岩土参数空间变异性的随机分析结果的地面沉降更大;沉降中心偏移距离受水平相关距离和竖向相关距离影响,前者影响更大;弹性模量空间变异性对沉降中心偏移距离和沉降槽宽度的影响比内摩擦角空间变异性更大;当洞室较大时,洞室对地面沉降曲线形态的影响远大于洞室周围岩土参数变异性。Based on random field theory,finite element numerical analysis and Monte-Carlo stochastic simulation method,the influence of spatial variability of geotechnical parameters on land subsidence was investigated.The spatial variability of the internal friction angle was focused as the representative,and the effects of the coefficient of variation,horizontal correlation distance and vertical correlation distance of the internal friction angle were systematically studied.It was found that the larger the coefficient of variation was,the higher the dispersion degree of land subsidence curve was;compared with the results of deterministic analysis,the ground subsidence of the stochastic analysis considering the spatial variability of geotechnical parameter was greater;the offset distance of settlement center was affected by horizontal and vertical correlation distance,and the former had greater influence;when cavern was large enough,the influence of cavern on land subsidence was stronger than that of spatial variability of geotechnical mechanical parameters.

关 键 词：地面沉降 空间变异性 相关距离 随机场理论 

分 类 号：TU478[建筑科学—结构工程]