地下水封石洞油库采用只锚喷而不衬砌的洞室支护形式,是目前公认最好的油品存储形式。喷射混凝土通过其与岩面的粘结强度传递应力,保证喷射混凝土和围岩的共同工作。粘结强度是分析评价地下水封石洞油库洞室结构稳定性及施工质量的重要指标。针对某地下水封石洞油库工程的主洞室,采用多种试验方法开展喷射混凝土与围岩粘结强度的研究。研究结果表明:直径50 mm隔离试件不适用于地下水封石洞油库的喷射混凝土与围岩粘结强度的试验,采用直径100 mm隔离试件可较大提高试件隔离成功率,钻芯隔离试件拉拔试验强度值可作为粘结强度下限值;喷大板切割岩块试件可反映喷射混凝土与岩块的粘结强度,室内拉力试验成果可作为粘结强度上限值。对于地下水封石洞油库喷射混凝土与围岩粘结强度,建议采用直径100 mm钻芯隔离试件现场拉拔和喷大板切割试件拉力试验进行测试,利用上、下限值综合评价粘结强度。试验成果为地下水封石洞油库洞室结构稳定及施工质量评价提供了重要应用参考。
Abstract
Currently recognized as the best form of oil storage, underground oil storage in rock cavern is supported only by bolt-shotcrete without lining. Bond strength plays an important role in transmitting stress to ensure the collaborative work between shotcrete and surrounding rock; as a result, bond strength is an important indicator for analyzing and evaluating the structural stability and construction quality in underground oil storage in rock cavern.In this research, several kinds of methods were adopted to test the bond strength between shotcrete and surrounding rock in a underground oil storage in rock cavern in south China. Results suggest that in-situ tensile method by drilling shotcrete specimen with a diameter of 50 mm is not suitable for underground oil storage in rock cavern. When the diameter of test specimen is increased to 100 mm, the success rate of specimen production for in-situ tensile test has greatly improved, and the tensile test results are reliable as the lower limiting value of bond strength. Meanwhile, result of laboratory tensile test by cutting panel-formed shotcrete with rock block is adopted as the upper limiting value of bond strength. In summary, the aforementioned two methods, namely, in-situ tensile method by drilling shotcrete specimen with a diameter of 100 mm, and tensile test by cutting panel-formed shotcrete with rock block, are recommended to evaluate the bond strength comprehensively. In other words, the results of the former could be referenced as the lower limiting value of bond strength and the results of the latter as the upper one. The research findings offer important application reference for the structural stability and construction quality in underground oil storage in rock cavern.
关键词
地下水封石洞油库 /
喷射混凝土 /
粘结强度 /
钻芯隔离现场拉拔试验 /
喷大板切割室内拉力试验
Key words
underground oil storage in rock cavern /
shotcrete /
bond strength /
in-situ tensile test by drilling /
laboratory tensile test by cutting panel-formed shotcrete with rock block
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基金
国家自然科学基金项目(51409013,51579016);中央级公益性科研院所基本科研业务费项目(CKSF2016038 /YT,CKSF2019194/YT)
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