基于围岩及灌浆圈非均质性的外水压力计算  

External water pressure computation based on heterogeneity of surrounding rock and grouting zone

作　　者：侯新文[1] 李常锁 郑婷婷[2] 邢立亭[3] 孙蓓蓓[3] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]山东省地矿工程勘察院,山东济南250014 [3]济南大学资源与环境学院,山东济南250022

出　　处：《煤炭学报》2015年第3期534-540,共7页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(41172222;41472216);济南市科技发展计划资助项目(201303082)

摘　　要：隧洞外水压力计算方法较多,每种方法都有优缺点。采用数值法来计算灌浆圈的外水压力,将围岩灌浆圈分为3层,计算了各层渗透系数不同以及等效后的渗透系数时条件下的外水压力。计算结果表明,随着衬砌渗透性的增加,外水压力逐渐减小。当考虑灌浆圈不同厚度的变化时,如果将围岩灌浆圈和钢筋混凝土衬砌当作一个整体考虑,衬砌外缘的外水压力下降幅度较大,灌浆圈外缘的外水压力下降幅度很小;当灌浆圈的渗透性与衬砌的渗透性相差不大时,衬砌的外水压力变化比较小,当灌浆圈的渗透性与衬砌的渗透性相差教大时,衬砌的外水压力变化比较大。经研究分析,采用数值法计算高压岔管区围岩及灌浆圈的外水压力有一定的实用性。There are many computational methods for calculating the external water pressure of tunnel and each of them has its own advantages and disadvantages.The surrounding rock and grouting zone were layered so that the correlation between external water pressure and the calculated permeability coefficients(also the equivalent permeability coefficient) of different layers can be found.The calculated results show that,with the increase of permeability of liner,the external water pressure reduces gradually.Considering the change of grouting zone thickness,the decrease of external water pressure of the liner outer edge is bigger than that of the grouting zone outer edge when taking grouting zone and the reinforced concrete liner as a whole.When there is tiny difference between the permeability of grouting zone and liner,the change of external water pressure of grouting zone outer edge is very small.However,when there is large difference between the permeability of grouting zone and liner,the change of external water pressure of grouting zone outer edge is also very large.Through the analysis and research,a numerical method is practical to calculate the external water pressures of the surrounding rock and grouting zone of high pressure branch pipe.

关 键 词：基岩 灌浆圈 非均质性 外水压力 

分 类 号：TV672.1[水利工程—水利水电工程]