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在铁路路基下进行顶管作业,常遇到松散的碎石土,易出现塌方,影响线路安全与安管质量。故此,需预先对土壤加固。对于空隙大的碎石土,可压注水泥浆,已有成功的经验。对于无法注入水泥颗粒的小空隙碎石土,只能采用非颗粒性浆液,且要求浆液在小空隙率即7～15％范围内,不但具有可灌性,而且,单方浆液成本不超过百元,并要求浆液能在低温下(4℃左右)发挥正常作用,2d龄期团结体的抗压强度达0.1～0.3MPa。
In the pipe jacking operation under the railway embankment, often encountered loose crushed soil, easy to collapse, affecting the safety and safety of the line. Therefore, soil reinforcement is required in advance. For large gravel soils, it is possible to press cement slurry and have had successful experience. For the small void gravel soil that cannot be injected into the cement particles, only non-granular slurry can be used, and the slurry is required to have a small void ratio of 7 to 15%, which is not only irrigable, but also the cost of the single slurry is not more than 100 yuan. , And require the slurry to play a normal role at low temperatures (about 4 °C), 2d in-phase solids compressive strength of 0.1 ~ 0.3MPa.