土压平衡盾构土仓压力设定与控制方法探讨

利用现有的土力学理论,对土压平衡盾构推进与停机两种状态下开挖面前方土压力与土仓内土压力类型进行了分析。通过理论计算和分析,提出了根据开挖面前方地层的地质条件和沉降要求等进行土仓压力设定的方法,指出了当土仓内土体与开挖面前方土体基本一致时,土仓压力很难与开挖面前方土压力基本相同。通过理论分析,提出了土仓压力控制的方法,以及采取土仓内土体改良、注入泡沫或高压气体形成气压、严格控制出土量等控制土仓压力的技术措施。

Study on the Method of Setting and Control Earth Pressure in the Earth Pressure Balance Shield

Using the existing soil mechanics theory,the type of earth pressure between in front of excavation face and in soil warehouse is analyzed when the EPBM is working or out of service.By theoretical calculation and analysis,the method is put forward that how to set earth pressure in soil warehouse according to the geological conditions in front of excavation face and sedimentation requirements.It is also pointed out that when the soil inside of warehouse is consistent with that in front of excavation face,earth pressure in soil warehouse is difficult to equal to earth pressure in front of excavation face.Through theoretical analysis,the method of control earth pressure in soil warehouse is put forward in conjunction with the technical measures that how to control earth pressure by improving soil,injecting bubble or forming air pressure by high-pressure gas and strictly controlling the amount of unearthed.