上海城市建设中深基坑开挖与周围环境保护

随着城市高层建筑的大量出现，我国的深基坑施工和施工工艺有了长足的进步。本文介绍了上海市两座大型、高层建设深基坑的开挖施工中对周转环境影响控制标准及采取的相应措施。     

深基坑开挖对既有地铁隧道的影响分析及控制措施

软土地区邻近地铁运营线路的深大基坑开挖是一项极其复杂的工程.基坑开挖过程中,如何保证地铁隧道的稳定和安全是整个工程中必须考虑的问题.通过同类工程实测反分析的设计施工参数,应用三维有限元分析手段,预估分析基坑开挖对紧邻地铁隧道的影响,探讨减少基坑开挖对紧邻地铁隧道影响的控制措施,以保证地铁的正常运营,为类似工程设计与施工提供借鉴和参考.     

抗光氧老化改性沥青的制备及其性能

采用70~#道路石油沥青作为基质沥青,水杨酸苯酯、2-羟基-4-甲氧基二苯甲酮作为紫外线吸收剂,制备不同紫外线吸收剂掺量的改性沥青。通过自制人工紫外线光源环境箱对沥青材料进行光氧老化试验,根据沥青老化前后软化点、针入度、延度的变化对比分析不同掺量紫外线吸收剂水杨酸苯酯、2-羟基-4-甲氧基二苯甲酮以及水杨酸苯酯和2-羟基-4-甲氧基二苯甲酮混合使用对沥青抗光氧老化能力的影响。试验结果表明:掺入水杨酸苯酯、2-羟基-4-甲氧基二苯甲酮会提高沥青的高温稳定性,略微降低其低温性能;水杨酸苯酯、2-羟基-4-甲氧基二苯甲酮均可提高沥青的抗光氧老化能力;水杨酸苯酯、2-羟基-4-甲氧基二苯甲酮复合制备的改性沥青抗光氧老化能力优于单掺水杨酸苯酯或2-羟基-4-甲氧基二苯甲酮的改性沥青。     

台北市共同沟建设现状及若干问题分析

配合城市新区建设和旧城改造而推行的共同沟建设，可改善城市道路交通，美化城市环境。本文通过台北市近十年来的共同沟建设现状的介 若干问题的分析，为上海的共同沟建设提供经验交流和参考。     

地铁车站与周边开发共建的差异沉降控制分析

阐述了地铁设施变形控制标准及共建建筑的差异沉降机理和规律。介绍了沉降计算方法和控制差异沉降的设计方法。结合上海轨道交通某地下车站与大型地下室共建、实施一体化设计施工的工程实践来探讨地铁车站与开发地块建筑共建的差异沉降控制技术。研究表明,选择合理的沉降计算方法及参数对工程差异沉降进行预估分析,并根据分析结果在设计上采取相应的技术措施,可将综合工程对地铁车站产生的差异沉降影响控制在地铁设施保护要求范围之内。     

地中壁工法控制邻近地铁深基坑变形的机理及应用

软土地区邻近地铁隧道及保护建筑物的深基坑开挖是一项复杂的工程,如何采取措施控制深基坑变形、保护环境,已成为一个重要的研究课题。结合工程实践,应用三维有限元分析方法,分析地中壁工法及其进一步控制深基坑变形的机理。对于邻近地铁隧道的深基坑开挖,在采取加强围护结构刚度、坑内加固、利用时空效应开挖支撑等措施来控制深基坑变形的同时,地中壁工法的应用可进一步控制深基坑变形,以保护邻近地铁隧道及建筑物的安全。     

地铁隧道上方基坑卸荷回弹及控制的试验和探讨

通过土体室内试验及对工程实践实测数据的分析,研究探讨位于地铁隧道上方的软土基坑卸荷回弹的特性和控制回弹的措施,以保证基坑下卧土层中地铁隧道的运营安全。     

Soil microstructure evolution and macro deformation mechanism for controlling construction disturbance in Shanghai soft soil

Abundant practical evidences have indicated that the soil progressively loses its structural configuration under construction disturbance and this can result in long-term macro deformation. The fundamental understanding of soil microstructure evolution subject to construction disturbance is necessary for controlling disturbance in excavation projects and minimizing ground settlement. The microstructure of Shanghai soft soil is investigated in this study. The laboratory isotropic compression tests are respectively performed on the virgin soil and the reconstructed Shanghai soft soil to investigate the macro deformation of soil under disturbance. Discrete element method model is used to study the micro particle level responses of soil under disturbance. The laboratory tests and numerical simulations provide theoretical basis for construction disturbance mitigation to ensure safety and stability of excavation projects.     

The settlement characteristic of underground urban complex in Shanghai

The effects of excavation unloading, construction reloading and underground water on basal heave of excavation projects were presented and analyzed based on the measurement results of an underground urban complex which was located in Shanghai. The effects on water pressure and building settlements were analyzed as well. The numerical analyses by finite element method (FEM) were conducted. It showed that the soil under the excavation base continued to heave during the following certain construction stage. It also found that the bearing capacity of uplift piles which supported the buildings affected the structure quality significantly. The conclusions can be applied in future projects. Foundation item: the National Natural Science Foundation of China (No. 50679041)