复杂地质条件下基坑工程施工技术研究与应用
发布时间：2018-10-24 20:47
【摘要】：随着我国经济的快速发展,城市建设步伐进一步加快,而城市规模的快速发展与建设用地紧张的矛盾日益激烈,因此开发地下空间,增加建筑物地下室层数成为工程建设中的重要手段。随着建筑工程基坑开挖深度的增大,地下土体土层复杂多变、基坑降水工程量大、土体支护稳定性差等特点逐渐显现,促使了工程技术人员对深基坑工程理论的研究与探索,但是也出现了许多惨痛的工程事故,基坑工程安全问题已成为基坑施工的一个严峻问题。研究以开滦协鑫发电有限公司(2x300MW)机组工程为例,对深基坑支护工程理论与施工技术进行了研究,为保证施工质量及工期的要求,对施工保证措施进行了探索,通过一系列措施的实施,降低工程成本。文中对分层横挖法进行介绍,通过改良开挖方式加快施工进度,开挖过程中,从一端沿横断面分层挖至设计标高,每层的运输道路和临时排水设施均单独分布,以适应深而短的开挖场地;为解决大量土方运出,采用每层纵向开挖,预定出土方向,分层独立运输及局部随机出土的方式;土方开挖支护中,将各种支护方法进行了合理匹配(原位土体+土钉+预应力锚杆+挂网喷射混凝土面层+支护排桩+工具式组合内支撑),以保证在一定范围内不同基坑开挖深度、环境、地质条件下超深基坑支护结构选型,不同工程基坑支护与工程永久结构统筹匹配同步设计,实现全寿命周期性效益的最大化。通过对复杂地质条件下深基坑工程设计与施工研究,以及相关保障措施的分析,为相似工程提供参考依据,对建立深基坑工程理论具有重要意义。
[Abstract]:With the rapid economic development of our country, the pace of urban construction has been further accelerated, and the contradiction between the rapid development of urban scale and the tension of construction land is becoming increasingly fierce, so the underground space is being developed. Increasing the number of basement floors has become an important means of engineering construction. With the increase of the excavation depth of the foundation pit, the complex and changeable soil layer, the large amount of foundation pit dewatering, the poor stability of soil support and so on, the research and exploration of the engineering theory of the deep foundation pit are promoted by engineers and technicians. However, there are many tragic engineering accidents, and the safety of foundation pit has become a severe problem in foundation pit construction. Taking the unit project of Kailuan Xiexin Power Generation Co., Ltd. (2x300MW) as an example, the theory and construction technology of deep foundation pit supporting engineering are studied. In order to ensure the construction quality and the requirement of construction period, the construction guarantee measures are explored. Through the implementation of a series of measures to reduce the cost of the project. In this paper, the method of delamination and transverse excavation is introduced, and the construction progress is accelerated by improving the excavation method. In the course of excavation, from one end along the cross section to the design elevation, the transport roads and temporary drainage facilities on each floor are distributed separately. In order to adapt to the deep and short excavation site, to solve the problem of large amount of earth moving out, we adopt the method of longitudinal excavation of each layer, predefined unearthed direction, stratified independent transportation and partial random excavations; in the excavation and support of earthwork, In order to ensure the different excavation depth and environment in a certain range, various supporting methods are reasonably matched (in situ soil nailing prestressed anchor bolt hanging net shotcrete surface support and pile layout tool combination support). In order to maximize the periodic benefit of the whole life, the supporting structure of ultra-deep foundation pit is selected under geological conditions, and the matching design of foundation pit support and permanent structure of different engineering projects is carried out as a whole. Through the study on the design and construction of deep foundation pit under complex geological conditions, as well as the analysis of relevant safeguard measures, this paper provides a reference for similar engineering, and is of great significance to the establishment of the theory of deep foundation pit engineering.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
本文编号：2292518
[Abstract]:With the rapid economic development of our country, the pace of urban construction has been further accelerated, and the contradiction between the rapid development of urban scale and the tension of construction land is becoming increasingly fierce, so the underground space is being developed. Increasing the number of basement floors has become an important means of engineering construction. With the increase of the excavation depth of the foundation pit, the complex and changeable soil layer, the large amount of foundation pit dewatering, the poor stability of soil support and so on, the research and exploration of the engineering theory of the deep foundation pit are promoted by engineers and technicians. However, there are many tragic engineering accidents, and the safety of foundation pit has become a severe problem in foundation pit construction. Taking the unit project of Kailuan Xiexin Power Generation Co., Ltd. (2x300MW) as an example, the theory and construction technology of deep foundation pit supporting engineering are studied. In order to ensure the construction quality and the requirement of construction period, the construction guarantee measures are explored. Through the implementation of a series of measures to reduce the cost of the project. In this paper, the method of delamination and transverse excavation is introduced, and the construction progress is accelerated by improving the excavation method. In the course of excavation, from one end along the cross section to the design elevation, the transport roads and temporary drainage facilities on each floor are distributed separately. In order to adapt to the deep and short excavation site, to solve the problem of large amount of earth moving out, we adopt the method of longitudinal excavation of each layer, predefined unearthed direction, stratified independent transportation and partial random excavations; in the excavation and support of earthwork, In order to ensure the different excavation depth and environment in a certain range, various supporting methods are reasonably matched (in situ soil nailing prestressed anchor bolt hanging net shotcrete surface support and pile layout tool combination support). In order to maximize the periodic benefit of the whole life, the supporting structure of ultra-deep foundation pit is selected under geological conditions, and the matching design of foundation pit support and permanent structure of different engineering projects is carried out as a whole. Through the study on the design and construction of deep foundation pit under complex geological conditions, as well as the analysis of relevant safeguard measures, this paper provides a reference for similar engineering, and is of great significance to the establishment of the theory of deep foundation pit engineering.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
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