advance grouting meaning in English

超前灌浆

Construction of flat tunnel of large span at extra - shallow depth must be conducted on the principle that advance grouting should be strictly performed before excavation and length of pull at one time should be short , together with reinforced support , immediate closing and constant monitoring and surveying . that preceding pilot tunnels , large - volume excavation divided into small ones , excavation of flank before that of center , upper before lower , arch before wall etc is a good method which could effectively reduce surface subsidence and its adverse effect on adjacent buildings , in addition , some other measures are also taken to lessen blast - induced vibration in the ground and surrounding structures . in a word , all means and steps mentioned above have already proved effective and practicable in practice
软弱大跨超浅埋扁平隧道必须按“管超前，严注浆，多分部、短开挖、强支护、快封闭，勤量测”的施工原则进行施工，采用“眼镜超前，化大为小，先侧后中，先上后下，先拱后墙”的施工方法控制地表沉降和对周边建筑物的影响；采用“多分部，化大为小，短进尺，密布眼，弱装药，设减振槽” ，控制爆破振动，经过实践证明，这些方法都是行之有效的。