全风化岩层渣土改良对盾构隧道开挖面稳定性的影响  

Inf luence of Residual Soil Improvement of Full Weathered Rock Stratum on Stability of Shield Tunnel Excavation Face

作　　者：加武荣 张孟喜[2] 邹文豪 张晓清[2] JIA Wurong;ZHANG Mengxi;ZOU Wenhao;ZHANG Xiaoqing(China Railway 20 Bureau Group Corporation Limited,Guangzhou Guangdong 511400,China;Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Shanghai Shentong Metro Group Co.Ltd.,Shanghai 200010,China)

机构地区：[1]中铁二十局集团有限公司,广东广州511400 [2]上海大学土木工程系,上海200444 [3]上海申通地铁集团有限公司,上海200010

出　　处：《铁道建筑》2018年第7期72-75,共4页Railway Engineering

基　　金：国家自然科学基金(41172238)

摘　　要：以佛莞城际铁路工程为依托,对泡沫改良渣土进行室内三轴快剪试验,分析不同泡沫比时渣土应力-应变关系和强度特性。建立基于计算流体动力学的三维流固耦合数值模型,分析泡沫比对开挖面支护压力、地表沉降的影响,以及渗透系数对孔隙水压力的影响。分析结果表明:泡沫比为20%的改良渣土比未改良渣土黏聚力减少9.72 k Pa,内摩擦角减少11.18°;开挖面纵向支护压力随着泡沫比的增大而减小;随着改良渣土渗透系数的增大,孔隙水压力明显减少;泡沫比越大,开挖面上方地表沉降越大。Based on the Foshan-Dongguan intercity railway project,indoor three axis quick shear test of foam improved residual soil was carried out and the stress-strain relationship and strength characteristics of residue soil with different foam ratio was analysed.The three-dimensional f luid solid coupling numerical model based on computational f luid dynamics was established,the inf luence of foam ratio on support pressure of excavation face and ground surface settlement was analysed,and the inf luence of permeability coeff icient on pore water pressure was discussed.The analysis results show that cohesive force of improved residual soil decreased by 9.72 kPa and internal friction angle decreased by 11.18°compared with unimproved residual soil when the foam ratio is 20%,vertical support pressure of excavation face decreases with the increase of foam ratio,the pore water pressure decreases with the permeability coeff icient of improved residual soil increasing,the ground surface settlement above the excavation face increases with the foam ratio increasing.

关 键 词：铁道隧道 渣土改良 试验研究 开挖面稳定性 全风化岩层 泡沫比 

分 类 号：U455[建筑科学—桥梁与隧道工程]