承压含水层群孔注浆效应及现场试验研究  

Effect of Hole Group Grouting in Confined Aquifer and Its Field Experiment

作　　者：王档良[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《地下空间与工程学报》2013年第S2期1956-1960,共5页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(40772192);国家自然科学基金项目(40372123);深部岩土力学国家重点实验室项目(PD1011)

摘　　要：群孔注浆效应理论认为,先序注浆孔浆液扩散范围会影响后序注浆孔浆液扩散范围,后序注浆孔浆液扩散使得地下水在先期浆液固化边界形成压力梯度增高带,导致浆液更容易向压力小的地方扩散流动;注浆设计时相邻两个注浆孔之间浆液扩散半径交圈实质是一种理想状态,其解释了单排布孔注浆很难形成完整注浆帷幕的原因;与单排布孔相比,多排布孔注浆更容易形成完整帷幕;由于群孔注浆效应的存在,多排注浆效果优于单排注浆效果;多排布孔注浆时,应先注外圈孔,后注内圈孔。本文在中国西部某煤矿立井工作面帷幕注浆工程中进行了现场试验,注浆过程中监测了不同位置注浆孔压力变化及检测孔涌水量变化情况。试验结果表明:单排注浆孔注浆结束后,在圈内形成高压区,在圈外形成低压区,浆液更容易从高压区向低压区流动;双排孔注浆效果优于单排孔注浆效果;多排孔注浆时,注浆顺序应先外圈,后内圈。The hole group grouting theory indicates that the diffusion range of the anterior grout will affect the diffusion range of the posterior grout,there will be a pressure gradient raising band of ground water formed at the boundary of consolidated anterior grout due to diffusion of the posterior grout,leading to flow of the grout to the place with less pressure. During the design of grouting,the intersection of diffusion radius of two neighbor holes is only an ideal state,which explains why the single row hole grouting could not give full grouting curtain. Compared with single row hole grouting,the multiple row hole grouting can form full curtain easier,which is superior to single row hole grouting due to hole group grouting effect. During multiple row hole grouting,the outer ring of holes should be grouted first,followed by inner ring of holes. A field experiment was carried out in a grouting work for a shaft of a coal mine in west China,the change of pressure in grouting hole and the water inflow in detecting hole during grouting were monitored. The results show that for single row hole grouting,there was high pressure zone inside the ring and low pressure outside the ring,it would be easy for the grout flew from high pressure zone to low pressure zone. The grouting effect of double row hole grouting is better than that of single row and for the multiple row hole grouting,the sequence is grouting for outer ring first,then for the inner ring.

关 键 词：群孔注浆 扩散效应 注浆半径 注浆理论 化学注浆 

分 类 号：TD265.4[矿业工程—矿井建设]