富水基岩井筒冻结壁砂质泥岩力学特性试验研究  

Experimental Study on the Sandy Mudstone Mechanical Properties of Shaft Sidewalls Under the Frozen Conditions

作　　者：杨更社[1] 吕晓涛[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《采矿与安全工程学报》2012年第4期492-496,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50974102;40872177)

摘　　要：在深厚表土层或基岩中建设煤矿井筒,冻结法是有效穿越不稳定的厚表土层或基岩的有效施工方法。为了给立井冻结壁和井壁设计提供合理的设计参数,对冻结壁岩石的力学特性试验很有必要。以陕西彬长矿区胡家河煤矿立井冻结施工工程为背景,对主井井筒砂质泥岩,进行了不同冻结温度梯度状态下的单轴、三轴力学特性试验研究。研究了砂质泥岩在相同围压不同温度条件下及相同温度不同围压条件下的强度和变形特性的变化规律。试验结果表明:随着冻结温度的降低,冻结砂质泥岩的强度在提高,主要原因是温度降低时,岩石冻结时的矿物收缩和冰本身的强度及冻胀力使得富水冻结岩石的强度得到提高。Freezing method is an effective construction method to pass through the thickest alluvium in coal mine shaft construction. It is more necessary to study the mechanical properties in order to provide reasonable design parameters for shaft frozen sidewalls. Taking the frozen shaft project of Hujia River coal mine in Shaanxi Bingchang coal mine area as the project background, sandy mudstone of passing through the key shaft were obtained from the engineering site, the uni-axial compression tests and tri-axial compression tests were conducted under different frozen temperatures. The strength and defor- mation characteristics of sandy mudstone were analyzed of the same temperatures under the condition of different confining pressures and the same confining pressure in the condition of different tempera-tures. The result shows that the uni-axial strength and tri-axial strength of sandy mudstone increases with the freezing temperatures dropping. The main reason is mainly due to the peak intensity of sandy mudstone greatly improved by mineral contraction, ice strength and frost heave force with temperature decreasing.

关 键 词：砂质泥岩 冻结 力学特性 试验研究 

分 类 号：TU473[建筑科学—结构工程]