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較土地区路基基底的加固方法有:反压馬道法,砂井法,砂垫层法,抛石填筑法,抽水排淤法,爆破排淤法及电化加固法等。砂井法是处理軟土路基基底的一种通用方法。这里,仅就用砂井法的施工組織設計加以介紹。一、用砂选择打砂井的目的,是使路基基底下的孔隙水,能通过砂井排出地面外,以凝固基底下的土壤。为此,应选用合乎规格的砂子。因为,选用的砂子粒径过細,砂粒間的空隙,将被粘附在砂粒周围的簿膜水充实,它将阻碍基底下的孔隙水流入砂井。粒径过粗,由于渗透作用,会把井壁周围的細粒土壤带入砂片,同样,将阻碍基底下的孔隙水自砂井法排出,失去加固基底的效用。一般說来,砂井用砂是可以通过篩分析确定的。
The reinforcement methods for the roadbed basement in the more land areas include counter-pressure horse way, sand well method, sand cushion method, riprap filling method, pumping silt deposition method, blasting siltation method and electrochemical strengthening method. The sand well method is a common method of dealing with soft soil subgrade basement. Here, only to use the sand well construction design to be introduced. First, the purpose of sand blasting with sand is to make the pore water under the subgrade so that it can be discharged out of the ground through sand wells to solidify the soil under the ground. To this end, should be used to meet the specifications of the sand. Because, the choice of the sand particle size is too small, the gap between the sand will be attached to the sand surrounding the membrane water filling, it will hinder the flow of pore water under the base into the sand well. Particle size is too coarse, due to infiltration, the fine soil around the shaft wall will be brought into the sand, the same will hinder the pore water under the basement from the sand well discharge, loss of the effectiveness of strengthening the substrate. In general, sand can be determined by sieve analysis.