| 基于冲切破坏模式的嵌岩桩桩端溶洞顶板临界厚度确定方法研究 |
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| 引用本文： | 袁维,刘尚各,聂庆科,王伟.基于冲切破坏模式的嵌岩桩桩端溶洞顶板临界厚度确定方法研究[J].岩土力学,2019(7):2789-2798. |
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| 作者姓名： | 袁维 刘尚各 聂庆科 王伟 |
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| 作者单位： | 石家庄铁道大学土木工程学院;河北省金属矿山安全高效开采技术创新中心;河北建设勘察研究院有限公司;中交第二公路勘察设计研究院有限公司;北京交通大学土木建筑学院 |
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| 基金项目： | 国家自然科学基金(No.51709176);河北省自然科学基金(No.E2018210046);河北省博士后科研项目择优资助计划(No.B2017003021)~~ |
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| 摘 要： | 桩端下伏溶洞顶板厚度是影响嵌岩桩竖向承载力的一个重要影响因素,在工程实践中,我国相关规范要求桩端平面以下的顶板厚度不小于3倍桩径。根据规范确定溶洞顶板厚度具有一定的经验性和笼统性,没有考虑溶洞顶板岩体质量,亦忽略了溶洞自身尺寸的影响。基于桩端岩体的冲切破坏模式,并结合广义Hoek-Brown准则和极限定理上限法建立了溶洞顶板临界厚径比(h/d,即顶板厚度h/基桩直径d)的计算方法,给出了不同岩体基本质量级别的临界厚径比建议值。结果表明:极限端阻力、岩石坚硬程度和岩体质量均对临界厚径比产生影响,极限端阻力越小、岩体质量越好、岩石越坚硬,则溶洞顶板的临界厚径比越小;以《工程岩体分级标准》(GB/T50218-2014)中岩体基本质量分级为参考依据,Ⅰ~Ⅳ级岩体的临界厚径比建议值分别是Ⅰ级岩体h/d≤2.41、Ⅱ级岩体2.41≤h/d≤2.96、Ⅲ级岩体2.96≤h/d≤3.73、Ⅳ级岩体3.73≤h/d≤4.91。
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| 关 键 词： | 溶洞顶板 临界厚径比 极限分析 HOEK-BROWN准则 嵌岩桩 竖向承载力 |
An approach for determining the critical thickness of the karst cave roof at the bottom of socketed pile based on punch failure mode |
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| YUAN Wei,LIU Shang-ge,NIE Qing-ke,WANG Wei.An approach for determining the critical thickness of the karst cave roof at the bottom of socketed pile based on punch failure mode[J].Rock and Soil Mechanics,2019(7):2789-2798. |
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| Authors: | YUAN Wei LIU Shang-ge NIE Qing-ke WANG Wei |
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| Affiliation: | (School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;Hebei Province Technical Innovation Center of Safe and Effective Mining of Metal Mines, Shijiazhuang, Hebei 050043, China;Hebei Research Institute of Construction & Geotechnical Investigation Co., Ltd., Shijiazhuang, Hebei 050031, China;CCCC Second Highway Consultants Co., Ltd., Wuhan, Hubei 430056, China;School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China) |
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| Abstract: | YUAN Wei;LIU Shang-ge;NIE Qing-ke;WANG Wei(School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;Hebei Province Technical Innovation Center of Safe and Effective Mining of Metal Mines, Shijiazhuang, Hebei 050043, China;Hebei Research Institute of Construction & Geotechnical Investigation Co., Ltd., Shijiazhuang, Hebei 050031, China;CCCC Second Highway Consultants Co., Ltd., Wuhan, Hubei 430056, China;School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China) |
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| Keywords: | karst cave roof critical thickness-diameter ratio limit analysis Hoek-Brown failure criterion socketed pile vertical bearing capacity |
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