Analysis on grouting pressure when grouting in overburden bed - separations in mine 矿山覆岩离层注浆时的注浆压力分析
The research indicates that the earth pressure is closely related to the grout pressure , grout depth and the soil character , and that it attenuates in the radial direction and upside 研究表明,注浆过程中引起的土中附加应力与注浆深度、注浆压力和土体的基本性状有关,且在径向和上部土体中衰减很快。
The theoretical calculation and simulating tests show that the grouting liquid with the stabilizing agent mac has good groutability . it has higher spreading radius than that used bentonite as stabilizing agent under the same grouting pressure . 4 理论计算和灌浆模拟实验表明聚合物稳定剂水泥浆液可灌性好,在相同一的灌浆压力下,聚合物稳定剂水泥浆扩散半径明显大于膨润土稳定剂水泥浆。
Gin is the abbreviation for grouting intensity number . it is showed by the product of the final grouting pressure p ( unit : mpa ) on the grouting section and the grouting volume v ( unit : l / m ) on every one meter of the grouting section , which means the energy consumed on every one meter of grouting section . according to gin method , if during the grouting construction , same energy is consumed on every grouting section , i . e . gin keeps to be a constant , an approximately uniform impervious curtain can be obtained Gin ( groutingintensitynumber )即灌浆强度值,它用灌浆孔段上最终的灌浆压力p ( mpa )和单位灌浆段长度浆液灌注量v ( l / m )的乘积表示,其含义为单位灌浆段上消耗的能量, gin法灌浆认为在灌浆施工中,保持各灌浆孔段上消耗一致的能量,即保持gin为常数,便可形成一道大致均匀的防渗帷幕。
The distance of the single - row curtain grout hole is between 1 . 4 to 1 . 8 meter , and 2 . 0 meter is suitable for the double - row curtain ; the grouting pressure generally is 1 . 0 to 1 . 5 mpa at the first three grout compartment , then grouting pressure of under the fourth control in 4 to 5 mpa ; for mast grout compartments , a water - cement ratio of 2 or 1 may used in the first grouting 钻孔密度也由原来的0 . slm / mz降至o . 64n扩mz ,节约工程投资447 . 35万元。 6 、单排帷幕的孔距在1 . 4一1 . 8m之间,双排帷幕的孔距以zm为宜;灌浆压力在地表以下前三段一般为1一1 . smpa ,第四段以下按4一smpa控制;对大部分孔段而言,开灌水灰比可定为2或1 。
8 . when using the index of the rock mass integrity , the index of the grouted rock mass integrity has raised one rank according to the theory and stand raised by this article . 9 . when grouting gallery of depth - curtain , lining and consolidation grouting to full - face of the gallery is necessary to meet the needs of the grouting pressure 8 、在利用岩体完整性指数评价高压帷幕灌浆效果时,采用本课题提出的“八级分档kv值与定性划分岩体完整程度对应关系表” ,灌浆后的岩体完整程度较灌前均提高了一个等级。
3 . the carstic formation is permeable layer and has quite good placeability , its relations of the water permeabitity and placeability have three types as follows : high unit - absorption rate with big grout consumption , the grouting is necessary ; low unit - absorption rate with little grout consumption , the grouting is no need ; low unit - absorption rate with big grout consumption , grouting is no need combining with control the grouting pressure and grout consumption . 4 岩体透水率与可灌性之间一般存在以下三种组合关系:高单位吸水率与大吃浆量的组合,灌浆是必需的;低单位吸水率与小吃浆量的组合,没有必要灌浆;低单位吸水率与大吃浆量的组合,应进行灌浆处理,但应适当控制灌浆压力和耗浆量。