膨胀土胀缩机理及其在控制隧道沉降中的应用
发布时间：2019-07-29 09:33
【摘要】：因黄土的膨胀特性导致的隧道地表沉降和变形坍塌事故屡见不鲜。为探究浅埋段膨胀土隧道地表沉降和变形控制技术,结合在建太兴铁路TXXS-2小河沟段膨胀土隧道施工,采用现场监测、理论分析和现场试验研究相结合的方法,对膨胀土的特性、胀缩机理及其影响因素进行研究,结合监控量测数据结果,提出地表沉降控制技术。通过对膨胀土微结构特征进行研究,引用了膨胀土的判别函数式,对膨胀土的膨胀潜势进行了分类,根据膨胀潜势情况指导施工;研究了膨胀土强度特性,建立了强度与含水量、干密度、饱和度的关系,并对有效蒙脱石含量对强度的影响进行研究,理论上分析了晶体胀缩的根本机理;根据对膨胀土胀缩特性进行研究,分析了隧道的膨胀潜势等级和隧道特殊地质特征,通过现场土工试验,确定了小河沟隧道胀缩影响因素及其曲线关系;通过对现场施工进行监控量测,结合关系曲线和现场情况,提出了控制地表沉降的处治措施,指导现场工程施工。
[Abstract]:Tunnel surface subsidence and deformation and collapse accidents caused by loess expansion are not uncommon. In order to explore the surface settlement and deformation control technology of expansive soil tunnel in shallow buried section, combined with the construction of expansive soil tunnel in TXXS-2 Xiaohegou section of Taixing Railway under construction, the characteristics, expansion and shrinkage mechanism and influencing factors of expansive soil were studied by means of field monitoring, theoretical analysis and field test research. combined with the results of monitoring and measurement data, the control technology of surface subsidence was put forward. By studying the microstructure characteristics of expansive soil, the expansive potential of expansive soil is classified by using the discriminant function of expansive soil, and the construction is guided by the expansion potential. The relationship between strength and water content, dry density and saturation of expansive soil is established, and the influence of effective montmorillonite content on strength is studied, and the fundamental mechanism of crystal expansion and shrinkage is analyzed theoretically. Based on the study of expansive soil expansion and shrinkage characteristics, the expansion potential grade of tunnel and the special geological characteristics of tunnel are analyzed, and the influencing factors and curve relationship of Xiaohegou tunnel expansion and shrinkage are determined through field geotechnical test. Through the field construction monitoring and measurement, combined with the relationship curve and field situation, the treatment measures to control the surface settlement are put forward to guide the field engineering construction.
【作者单位】： 山东科技大学资源与土木工程系;山东科技大学土木工程与建筑学院;山东华联矿业股份有限公司;
【基金】：国家自然科学基金(41372289) 山东省高等学校科技计划项目(12LH03) 中国博士后科学基金(2012M521365)
【分类号】：U451;U456.3
[Abstract]:Tunnel surface subsidence and deformation and collapse accidents caused by loess expansion are not uncommon. In order to explore the surface settlement and deformation control technology of expansive soil tunnel in shallow buried section, combined with the construction of expansive soil tunnel in TXXS-2 Xiaohegou section of Taixing Railway under construction, the characteristics, expansion and shrinkage mechanism and influencing factors of expansive soil were studied by means of field monitoring, theoretical analysis and field test research. combined with the results of monitoring and measurement data, the control technology of surface subsidence was put forward. By studying the microstructure characteristics of expansive soil, the expansive potential of expansive soil is classified by using the discriminant function of expansive soil, and the construction is guided by the expansion potential. The relationship between strength and water content, dry density and saturation of expansive soil is established, and the influence of effective montmorillonite content on strength is studied, and the fundamental mechanism of crystal expansion and shrinkage is analyzed theoretically. Based on the study of expansive soil expansion and shrinkage characteristics, the expansion potential grade of tunnel and the special geological characteristics of tunnel are analyzed, and the influencing factors and curve relationship of Xiaohegou tunnel expansion and shrinkage are determined through field geotechnical test. Through the field construction monitoring and measurement, combined with the relationship curve and field situation, the treatment measures to control the surface settlement are put forward to guide the field engineering construction.
【作者单位】： 山东科技大学资源与土木工程系;山东科技大学土木工程与建筑学院;山东华联矿业股份有限公司;
【基金】：国家自然科学基金(41372289) 山东省高等学校科技计划项目(12LH03) 中国博士后科学基金(2012M521365)
【分类号】：U451;U456.3
【参考文献】
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