基于统一强度理论的TBM斜井围岩弹塑性解

发布时间：2018-01-06 16:31

本文关键词：基于统一强度理论的TBM斜井围岩弹塑性解　出处：《采矿与安全工程学报》2016年05期 　论文类型：期刊论文

【摘要】：对TBM斜井围岩应力场和渗流场进行耦合分析,基于统一强度理论对斜井围岩进行弹塑性力学研究,考虑中间主应力、侧压力系数、斜井倾角和渗流作用的影响,推导出TBM斜井衬砌和围岩中应力、位移解析表达式及塑性区半径计算式。结合工程实例计算分析,结果表明考虑中间主应力作用时,围岩自身稳定性得到增强;在二向非等压状态下,围岩侧压力系数、斜井倾角和渗流作用会对围岩塑性区分布和应力大小产生不同程度的影响。研究结果为渗流条件下TBM斜井施工及安全性评价提供了理论依据,具有工程参考意义。
[Abstract]:The coupling analysis of stress field and seepage field of surrounding rock in TBM inclined shaft is carried out. Based on the unified strength theory, the elastoplastic mechanics of surrounding rock of inclined shaft is studied, and the intermediate principal stress and lateral pressure coefficient are considered. The influence of inclined angle and percolation of inclined shaft on the stress and displacement in lining and surrounding rock of TBM inclined shaft is derived. The analytical expression of stress and displacement and the formula for calculating the radius of plastic zone are derived, and the calculation and analysis are combined with engineering examples. The results show that the stability of the surrounding rock is enhanced when the intermediate principal stress is taken into account. Under the condition of two-direction non-isobaric pressure, the lateral pressure coefficient of surrounding rock is obtained. Inclined angle and percolation will affect the distribution of plastic zone and stress of surrounding rock to varying degrees. The results provide theoretical basis for the construction and safety evaluation of TBM inclined well under seepage condition. It has engineering reference significance.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;北京住总集团有限责任公司轨道交通市政工程总承包部;
【基金】：国家自然科学基金重点项目(U1261212);国家自然科学基金项目(51274209,41472259)
【分类号】：TD32
【正文快照】： 我国煤矿产能快速增长,对于千万吨级及以上矿井来说,立井提升是制约煤炭产能的主要瓶颈之一,目前主要采用斜井开拓提升改善矿井运输条件。TBM具有安全、高效、快速等优点,逐渐成为长斜井施工的首选,受到施工单位的广泛认可[1]。对于斜长6 000 m以上、坡度为6°的TBM施工煤矿斜

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