The effects of grouting circle will not share the external water pressure with tunnel lining, but block groundwater and reduce the external water pressure on lining remarkably with low discharge.
The chemical grouting is one of effective methods to treat mine quicksand in difficult grouting strata with lowgroutingpressure.
化学注浆是解决难灌注地层和低压条件下的矿井水砂灾害防治的有效手段。
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Step one is to grout with lowgroutingpressure to fill the gravel pack interval and blocked the channels which relieves the grouting pressure in the shallow surrounding rock.