摘要
针对西部地区深基岩冻结井筒支护结构设计中出现的技术难题,通过室内冻胀试验结果表明:西部地区岩石冻胀性弱,冻结压力小,外壁设计主要应满足厚壁圆筒结构对厚度的要求。根据渗流场理论分析表明:在不进行壁后围岩注浆情况下,如果井壁基本不渗水,井壁将承受全水压;如果井壁出现渗漏水,则井壁承受的水压将大大减小,水压力折减系数主要取决于围岩渗透系数与井壁混凝土渗透系数的比值关系。在进行壁后注浆条件下,注浆效果越好,围岩渗透性越小,在井壁渗透系数相同情况下,井壁承受的水压力将得到大大减小。并提出可采用内、外壁间提前注浆技术、对壁后围岩进行深孔注浆等井壁结构优化途径。
Aiming at technical problems in the shaft structural design of freezing bedrock shaft in west area,the test result of frost heaving indicates that the frost heave of rock in west area is feeble,and freezing pressure is small,the design of outer lining mainly suffices thick require of thick wall cylinder structure. According to the analysis of seepage theory,the shaft wall will endure full water pressure in instance of no surrounding rock grouting behind shaft wall if shaft wall do not seep water. If the shaft lining seep water,the water pressure which the shaft wall endures will greatly decrease,the reduction coefficient of water pressure chiefly lies on ratio relation between surrounding rock permeability coefficient and concrete permeability coefficient of shaft. In the condition of grouting behind shaft wall,the more the effect of grouting is,the smaller the surrounding rock permeability coefficient is,and the water pressure which the shaft wall endures will greatly decrease in the same condition of surrounding rock permeability coefficient. Then the approach of shaft wall structural optimization was put forward,such as advancing grouting technique between inner shaft and outer shaft,deep drilling grouting in the surrounding rock behind shaft.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第5期760-764,共5页
Journal of China Coal Society
基金
安徽省自然科学基金资助项目(090414165)
安徽高校省级自然科学研究计划重点资助项目(KJ2009A010)
关键词
基岩冻结
井筒
井壁结构
设计优化
bedrock freezing
shaft
shaft lining structure
design optimization
