Based on a shallow roadway with weakly cemented soft strata in western China, this paper studies the range and degree of plastic zones in soft strata roadways with weak cementation. Geological radars were used to moni...Based on a shallow roadway with weakly cemented soft strata in western China, this paper studies the range and degree of plastic zones in soft strata roadways with weak cementation. Geological radars were used to monitor the loose range and level of surrounding rocks. A mechanical model of weakly cemented roadway was established, including granular material based on the measured results. The model was then used to determine the plastic zone radium. The predicted results agree well with measured results which provide valuable theoretical references for the analysis of surrounding rock stability and support reinforcing design of weakly cemented roadways. Finally, a combined supporting scheme of whole section bolting and grouting was proposed based on the original supporting scheme. It is proved that this support plan can effectively control the deformation and plastic zone expansion of the roadway surrounding rock and thus ensure the long-term stable and safe mining.展开更多
为解决高速铁路软弱围岩隧道机械化大断面施工技术经济性评估不足、适用范围模糊的问题,以成达万铁路四座不同围岩级别隧道为对象展开研究.目前,常规机械化施工技术在软弱围岩环境下存在成本高、效率低、支护适配性差等问题.研究采用现...为解决高速铁路软弱围岩隧道机械化大断面施工技术经济性评估不足、适用范围模糊的问题,以成达万铁路四座不同围岩级别隧道为对象展开研究.目前,常规机械化施工技术在软弱围岩环境下存在成本高、效率低、支护适配性差等问题.研究采用现场定额测定法,综合考虑工艺革新带来的影响,构建经济对比体系.结果显示,在Ⅲ—Ⅴ级软弱围岩、断面面积60~120 m 2的隧道施工中,该技术相比常规工法,成本降18%~25%,工期缩15%~20%,围岩-支护稳定性显著提升.研究明确了该技术适用边界,为施工方案制定提供依据,对类似项目提供借鉴.展开更多
基金provided by the National 973 Programs(No.2014CB046905)the National Natural Science Foundation of China(Nos.51274191 and 51404245)+1 种基金the Doctoral Fund of Ministry of Education(No.20130095110018)China Postdoctoral Science Foundation(No.2014M551699)
文摘Based on a shallow roadway with weakly cemented soft strata in western China, this paper studies the range and degree of plastic zones in soft strata roadways with weak cementation. Geological radars were used to monitor the loose range and level of surrounding rocks. A mechanical model of weakly cemented roadway was established, including granular material based on the measured results. The model was then used to determine the plastic zone radium. The predicted results agree well with measured results which provide valuable theoretical references for the analysis of surrounding rock stability and support reinforcing design of weakly cemented roadways. Finally, a combined supporting scheme of whole section bolting and grouting was proposed based on the original supporting scheme. It is proved that this support plan can effectively control the deformation and plastic zone expansion of the roadway surrounding rock and thus ensure the long-term stable and safe mining.
文摘为解决高速铁路软弱围岩隧道机械化大断面施工技术经济性评估不足、适用范围模糊的问题,以成达万铁路四座不同围岩级别隧道为对象展开研究.目前,常规机械化施工技术在软弱围岩环境下存在成本高、效率低、支护适配性差等问题.研究采用现场定额测定法,综合考虑工艺革新带来的影响,构建经济对比体系.结果显示,在Ⅲ—Ⅴ级软弱围岩、断面面积60~120 m 2的隧道施工中,该技术相比常规工法,成本降18%~25%,工期缩15%~20%,围岩-支护稳定性显著提升.研究明确了该技术适用边界,为施工方案制定提供依据,对类似项目提供借鉴.
