Practice of stress force monitor system measuring pre - support pressure in mining face 應(yīng)力監(jiān)測(cè)系統(tǒng)監(jiān)測(cè)采面超前支撐壓力實(shí)踐
Combined with the real example of monitoring pressure on the supporting system in the long span underground space of dk7 + 692 section at jiao - xin line of chongqing light railway , it is set forth the methods about choosing the support system and its parameter , digging methods of underground space , measuring and testing methods for the stress of the support system ; the testing results and variation pattern were analyzed for the stress of the initial supporting i - steel axial stress of bolt , stress of shot - concrete , supporting pressure of temporary i - steel and stress of steel of the second lining , then , the reason for deformation of the support system induced by sharp increase of i - steel was determined 摘要結(jié)合重慶市輕軌較新線大坪車站大跨度地下空間dk7 + 692斷面施工支護(hù)體應(yīng)力監(jiān)測(cè)的工程實(shí)例,闡述了該大跨度地下空間支護(hù)結(jié)構(gòu)的參數(shù)選擇、地下空間的開(kāi)挖方法、支護(hù)體結(jié)構(gòu)的應(yīng)力量測(cè)方法及測(cè)試手段;分析了支護(hù)體初期支護(hù)工字鋼拱應(yīng)力、錨桿軸力、噴射混凝土內(nèi)應(yīng)力、臨時(shí)工字鋼支撐應(yīng)力、二次襯砌鋼筋應(yīng)力等測(cè)試結(jié)果和變化規(guī)律;確定了工字鋼拱應(yīng)力急劇增大而可能引起支護(hù)體系失穩(wěn)的原因。