大流速地下水作用下多圈冻结孔优化布置方法研究  

Study on Optimal Arrangement Method of Multi-circle Frozen Hole Under Action of Large Velocity Groundwater

作　　者：董艳宾 荣传新[1] 王彬[1] 杨凡 DONG Yanbin;RONG Chuanxin;WANG Bin;YANG Fan(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《煤矿安全》2020年第4期18-25,共8页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51878005,51374010);国家科技重大专项资助项目(2016YFC0600902)。

摘　　要：为了解决大流速地下水作用下多圈冻结管形成的冻结壁不易交圈或交圈时间延长等工程问题,提出采用在水流上游位置加密布置冻结管的方法对常规冻结方案进行优化设计。基于表观热容法构建了水热耦合数学模型,并通过大型物理模型试验对数学模型的合理性进行了验证。运用该数学模型对淮南潘一矿原冻结设计参数及其优化方案进行了分析。结果表明:对双圈管的外圈上游120°范围内的冻结管进行加密处理后,当地下水流速为10、15、20 m/d时,优化方案相较于常规方案在3种流速下的冻结壁交圈时间分别提前了7、13、57d,并且对应相同的冻结时间,优化后的冻结壁的厚度明显增加。To solve the problem that the frozen wall formed by multi-circle freezing pipes is not easy to be closed under the action of groundwater with high flow rate, in view of the action characteristics of groundwater on the artificial freezing temperature field, it was proposed to optimize the design of the conventional freezing scheme by encrypting the freezing pipes at the upstream position of the water flow. The hydrothermal coupling mathematical model was constructed based on the apparent heat capacity method, and the rationality of the mathematical model was verified by large physical model tests. The mathematical model was used to analyze the effect of the freezing optimization scheme of a shaft in Huainan Mining Area. The results show: after encrypting the freezing pipes in the range of 120 degrees upstream of the outer ring of the double-loop pipes, compared with the conventional scheme, the closure time of the frozen wall at three flow rates was shortened by 7d, 13d and 57d, respectively,when the groundwater flow rate was 10 m/d, 15 m/d, 20 m/d. And the thickness of the frozen wall was obviously increased corresponding to the same freezing time.

关 键 词：冻结法凿井 水热耦合 优化设计 数值计算 冻结壁 

分 类 号：TD265.3[矿业工程—矿井建设]