| 苏凯,陶军,徐振东,王博士,朱洪泽.穿越城区隧洞分离式衬砌承载机理及性能优化研究[J].水利学报,2023,54(1):54-67 |
| 穿越城区隧洞分离式衬砌承载机理及性能优化研究 |
| Bearing mechanism and performance optimization of Detached Steel-Tube Liner for water conveyance tunnel across urban area |
| 投稿时间：2022-04-29 |
| DOI：10.13243/j.cnki.slxb.20220337 |
| 中文关键词: 穿越城区输水隧洞 分离式衬砌 排水板 承载机理 承载比 |
| 英文关键词: water conveyance tunnel across urban area detached steel-tube liner drainage plate bearing mechanism bearing ratio |
| 基金项目:国家自然科学基金项目(51879207);国家重点研发计划项目(2016YFC0401803) |
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| 中文摘要: |
| 近年来我国兴建的穿越城区引水隧洞工程采用了一种新型分离式衬砌,但其承载机理尚不够明晰。以某水资源配置工程中穿越城区的TBM施工输水隧洞为对象,建立输水隧洞分离式衬砌整体三维有限元数值模型,分析了衬砌的变形、受力和承载比等特征。结果表明:设计内压作用下,钢衬和自密实混凝土径向紧密贴合,排水板铺设范围内两者径向变形明显大于管片,排水板铺设范围外三者径向同步变形,钢衬应力水平低且分布极不均匀,管片应力超过抗裂限值,内水压主要由围岩承担,钢衬承载比例明显低于预期;降低钢衬-自密实混凝土界面、自密实混凝土-管片界面的摩擦系数,均能使钢衬应力分布的均匀性增加,有利于钢衬承载性能的发挥,且对管片抗裂有利;提高排水板厚度与综合模量比值d/E,可以提升钢衬承载比,控制d/E在12.4~45.1 mm3/N范围内,可以满足钢衬容许应力和管片抗裂设计的要求,同时使分离式衬砌钢衬主要承担内水压的设计理念得以实现。 |
| 英文摘要: |
| In recent years, a new type of Detached Steel-tube Liner has been adopted in the construction of diversion tunnel across urban area in China, but its design concept and bearing mechanism is not clear. A three-dimensional finite element model for the TBM water conveyance tunnel across urban area is developed after a water resources allocation project. The deformation characteristic, stress distribution and bearing ratio of Detached Steel-tube Liner are analyzed. The results show that the radial deformation of steel liner and self-compacted concrete is coordinated under the design internal pressure. The radial deformation of steel liner and self-compacted concrete is obviously larger than that of the segments within the laying range of plastic drainage plate while the radial deformation of steel liner, self-compacted concrete and segments remains coordinated outside the laying range of plastic drainage plate. The stress level of steel liner is low and the distribution is very uneven while the stress of segments exceeds the limit of crack control. The internal water pressure is mainly borne by surrounding rock, and the bearing ratio of steel liner is obviously lower than expected; both the reduction of the friction coefficient between steel liner and self-compacted concrete, self-compacted concrete and segments can improve the uniformity of stress distribution of steel liner, which can give full play to the performance of steel liner, and it is also of great significance to the crack control of segments; the bearing ratio of steel liner increases when d/E (the ratio of thickness of plastic drainage plate to its comprehensive elastic modulus) is larger. To meet the design concept that the internal pressure is mainly shared by steel liner, d/E should be controlled at 12.445.1 mm3/N with the allowable stress of steel liner and crack control design of segments considered. |
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