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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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公路隧道外水压力的相似模型试验研究
, PP. 99-104
Keywords: 隧道工程,外水压力,相似模型试验,折减系数,相似比,复合回填
Abstract:
针对确定公路隧道衬砌外水压力的技术难题,利用自行设计的模型试验装置,采用相似理论,进行了38组工况试验。试验主要研究了水头高度、渗透系数、隧道排放量以及组合排放系统等因素与外水压力和折减系数的关系。通过对相似准则的分析得出,进行工程类比时应注意水头高度的相似关系为平方关系。试验结果表明水头高度越小、隧道排放量越大、围岩渗透系数越小,隧道外水压力则越小;无论隧道是否完全封堵,只要周边存在排水点,且隧道在其渗流影响的范围之内,隧道外水压力就可折减。此外,深入分析组合排放系统的试验结果,提出了对于隧道周边富水洞穴应采用"复合回填"的处治方式的理念。最后指出,采用这种相似模型试验确定的外水压力是岩石隧道外水压力的上限值。
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