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季节冻土地区强风化砂泥岩隧道边墙开裂原因分析及整治对策研究 被引量:7
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作者 吴剑 郑波 师亚龙 《铁道建筑》 北大核心 2015年第6期67-71,共5页
采用理论分析、数值计算、室内及现场试验等方法,结合准格尔至朔州铁路梁家坪2号隧道的工程实际,对季节冻土地区强风化砂泥岩季节性冻胀对隧道结构的影响进行了研究。该隧道边墙纵向开裂是由于隧道含水围岩的季节性冻胀所致,对此提出了... 采用理论分析、数值计算、室内及现场试验等方法,结合准格尔至朔州铁路梁家坪2号隧道的工程实际,对季节冻土地区强风化砂泥岩季节性冻胀对隧道结构的影响进行了研究。该隧道边墙纵向开裂是由于隧道含水围岩的季节性冻胀所致,对此提出了锚固、注浆、挂网喷混凝土的衬砌开裂整治措施,并指出了现行规范中的不足,即应根据含水围岩冻胀率和围岩冻结深度来综合确定是否考虑冻胀力。 展开更多
关键词 强风化砂泥岩 隧道 边墙开裂 季节冻胀 整治对策
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Combination effect of seasonal freezing and artificial freezing on frost heave of silty clay 被引量:7
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作者 于琳琳 徐学燕 马琛 《Journal of Central South University》 SCIE EI CAS 2010年第1期163-168,共6页
To investigate the frost-heave properties of silty clay under the combination action of seasonal freezing and artificial freezing, and verify the feasibility of combined freezing, eight combined freezing experiments w... To investigate the frost-heave properties of silty clay under the combination action of seasonal freezing and artificial freezing, and verify the feasibility of combined freezing, eight combined freezing experiments were performed on silty clay with water content (mass fraction) of 23.5% and 28.0%, through developed frost-heave test apparatus, in closed or open system. Two sorts of freezing temperature models, namely, constant and sine models, were applied to artificial freezing. The experimental results indicate that the frost-heave degree in seasonal freezing stage accounts for over 90% of the total in open system and it is up to 95% in closed system; the change of artificial sine-freezing temperature has no influence on the frost-heave degree in closed system, however, slight influence in open system. It is found that the variation of temperature gradient of sine-freezing specimen lags behind that of sine-freezing temperature with half phase; sine-freezing temperature model can reduce frost-heave degree of soil. Brand new technology is proposed for the application of artificial ground freezing and new study field of artificial freezing is created. 展开更多
关键词 seasonal freezing artificial freezing combined freezing sine-freezing freezing-temperature models frost-heave degree
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