机械预切槽法施工过程中槽内混凝土相关问题研究

发布时间：2018-03-11 07:36

本文选题：机械预切槽　切入点：混凝土　出处：《现代隧道技术》2017年01期 　论文类型：期刊论文

【摘要】：机械预切槽法结合了盾构的盾壳保护开挖理念和新奥法处理复杂地层自由灵活的理念,在预筑拱的保护下可以进行下部隧道大断面开挖。这种方法在土砂等强度极低场合以及近接施工方面具有显著的优势,是一种很有发展潜力的隧道施工方法。文章结合当前预切槽法试验中槽内混凝土喷灌困难这一难题,在资料调研及计算分析基础上,论述了预切槽法对槽内混凝土强度及其它性能的特殊要求,计算得出双线大断面黄土隧道切槽内混凝土8h抗压强度应达到12 MPa,研究提出要解决槽内混凝土难以喷灌的问题,需要改进传统的喷混凝土设备,同时要优化混凝土配比并进行切槽混凝土的室内试验和现场取芯试验对比。
[Abstract]:The mechanical pre-cutting method combines the shield shell protection and excavation concept of shield machine and the flexible concept of the New Ordovician method to deal with complex strata freely. Large section excavation of the lower tunnel can be carried out under the protection of pre-arch. This method has obvious advantages in very low strength and near joint construction, such as soil and sand, etc. It is a kind of tunnel construction method with great potential for development. This paper combines with the difficult problem of sprinkling irrigation of concrete in the slot in the test of pre-cutting method, based on the investigation of data and the calculation and analysis. This paper discusses the special requirements for concrete strength and other properties in the slot by pre-cutting method, and calculates that the compressive strength of concrete in the slot of double-line large section loess tunnel should be up to 12 MPA for 8 h. The problem that it is difficult to sprinkle the concrete in the slot is studied and put forward. It is necessary to improve the traditional shotcrete equipment and optimize the ratio of concrete and carry out the indoor test and the field core-taking test of the slotted concrete.
【作者单位】：中铁第四勘察设计院集团有限公司;北京交通大学土建学院;
【基金】：国家自然科学基金项目(51178026)
【分类号】：U455.4

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