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盾构机的选型直接决定盾构法施工工程是事半功倍还是事倍功半,不宜凑合使用,关键在于紧密结合工程的地质条件。成都地铁一号线穿行区的地质特点有二:一是卵石层,有报告称卵石含量竟占68％,粒径30-550mm,漂石最大粒径超过270mm;二是地下水位高,透水系数大。据此,在盾构机选型方面,建议考虑以下几点。1宜优选加泥式土压平衡盾构亦称高浓度泥浆盾构,其泥浆浓度亦应可调。不宜采用泥水加压盾构。因为卵石漂石在管道中输送时阻力大,输送效率低。
Shield machine selection directly determines the shield construction project is a multiplier or less effective, should not be used improperly, the key lies in close integration with the geological conditions of the project. There are two geological characteristics of Chengdu Metro Line passing area: First, the pebble layer, reportedly accounted for 68% of pebble content actually, the particle size of 30-550mm, the largest particle size of more than 270mm boulder; Second, the high groundwater level, water permeability coefficient Big. Accordingly, the selection of shield machine, it is recommended to consider the following points. 1 should be preferred plus clay soil pressure balance shield also known as high concentration mud shield, the mud concentration should be adjustable. Should not use mud pressure shield. Because pebbles boulder transport resistance in the pipeline, delivery efficiency is low.