考虑固结影响的双洞盾构隧道非同步施工引起的土体变形研究  

Study on Soil Deformation Induced by Non-synchronous Construction of Double-tube Shield Tunnels Considering Consolidation

作　　者：张稳军[1,2] 苏忍[1,2] 张高乐[1,2] 金明明[1,2] 孔恒 小泉淳[4] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072 [3]北京市政建设集团有限责任公司,北京100048 [4]早稻田大学理工学术院

出　　处：《中国公路学报》2016年第9期103-111,151,共10页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51378342);教育部高等学校博士学科点专项科研基金项目(20120032120050)

摘　　要：为了研究双洞盾构隧道非同步施工时施工进度差对沉降的影响,尤其是先行隧道施工对周围土体扰动后的固结沉降影响,基于Peck公式和现有研究成果,通过考虑隧道开挖后的固结沉降影响,提出了可计算双洞盾构隧道非同步开挖引起的地表及深部土体变形公式。基于北京地铁十四号线枣营站—东风北桥站区间盾构隧道的实测结果,验证了提出的理论计算公式具有一定的合理性和适用性,并针对该工程进行了单一土层和多层土体的沉降槽规律分析。研究结果表明:隧道覆土厚度相同的条件下,多层土体与单一黏性土层相比沉降槽的宽度减少了40%,深度增加了29%,与单一砂层相比沉降槽的宽度增加了22%,深度减少了28%。In order to investigate the effect of the time difference of construction progress on the settlement induced by the non-synchronous construction of double-tube shield tunnels,it is necessary to consider the consolidation settlement of soil induced by advancing tunnel construction.Considering the consolidation settlement effect after tunnel excavation,the deformation formula of ground surface and deep soil under the non-synchronous construction of double-tube shield tunnels was proposed based on the Peck formula and the previous research results.The rationality and applicability of the proposed formula were verified using the monitoring data of the shield tunnel section between Zaoying station and Dongfeng Beiqiao station of Beijing metro line 14.The varying tendencies of settlement trough of single strata and multilayered stratum were also analyzed.The results show that the width of settlement trough ofmulti-layered stratum reduces by 40% and the depth increases by 29% comparing with those of single cohesive strata.Meanwhile,the width of multi-layered stratum increases by 22%and the depth reduces by 28%comparing with those of single sandy strata under the same overburden thickness.

关 键 词：隧道工程 双洞盾构隧道 理论分析 非同步施工 固结沉降 土体变形 

分 类 号：U459.3[建筑科学—桥梁与隧道工程]