CAJ | 학술논문

针对采用双层复合井壁的井筒掘进断面有效利用率大幅降低的情况，提出一种新型单层冻结井壁结构，为获得该种井壁结构的水平承载特性，采用相似模拟试验方法，研究3个井壁的水平极限承载特性和变形破坏特征，研究结果表明，井壁竖向、环向应变值、竖向位移与竖压一致性较好，不会出现机械滞后的问题；井壁所受竖压可视为均匀竖压；泊松比与混凝土强度无关，弹性模量与混凝土强度相关；竖向极大正位移与加载围压之前的最大竖向荷载呈正比关系；竖向极大位移与水平极值位移/水平极限荷载基本呈正比关系；在忽略竖压影响的情况下，径向位移与水平应力基本上呈正比关系；井壁破坏时内侧压应变远大于井壁外侧，内侧总压应变一般为-2000～-2500με，有时达到并超过-3000με；新型单层井壁极限承载力高于普通混凝土井壁。研究结果对完善新型单层井壁设计理论以及指导新型单层井壁快速、科学施工等均具有重要意义。
침대채용쌍층복합정벽적정통굴진단면유효이용솔대폭강저적정황，제출일충신형단층동결정벽결구，위획득해충정벽결구적수평승재특성，채용상사모의시험방법，연구3개정벽적수평겁한승재특성화변형파배특정，연구결과표명，정벽수향、배향응변치、수향위이여수압일치성교호，불회출현궤계체후적문제；정벽소수수압가시위균균수압；박송비여혼응토강도무관，탄성모량여혼응토강도상관；수향겁대정위이여가재위압지전적최대수향하재정정비관계；수향겁대위이여수평겁치위이/수평겁한하재기본정정비관계；재홀략수압영향적정황하，경향위이여수평응력기본상정정비관계；정벽파배시내측압응변원대우정벽외측，내측총압응변일반위-2000～-2500με，유시체도병초과-3000με；신형단층정벽겁한승재력고우보통혼응토정벽。연구결과대완선신형단층정벽설계이론이급지도신형단층정벽쾌속、과학시공등균구유중요의의。
Aiming at the situation that the effective excavated section utilization reduced sharply in composite shaft lining,a new type monolayer shaft lining structure was put forward. To obtain horizontal bearing capacity of this kind of shaft lining,similar simulation tests were used to study horizontal ultimate bearing capacity and deformable character on three shafts. The results indicate that:vertical strain and circumferential strain as well as vertical displacement of shaft lining better consistent with vertical stress,no mechanical hysteresis appeared;vertical pressure loading on shaft wall can be considered as uniform;the concrete strength is independent of poisson ratio,but relate to the elasticity coefficient;vertical maximum positive displacement and maximum vertical load before confining pressure being loaded related positively;vertical maximum positive displacement is almost proportional to the ratio of horizontal displacement and most horizontal load positively;Ignoring vertical pressure,radial displacement is proportional to the level stress positively;the inside compression strain is much larger than the sidewall lateral when shaft lining is crushed,the total inside compression strain is between-2 000 and -2 500 με,sometimes reaches -3 000 με,even exceeding;ultimate bearing capacity of new monolayer freezing shaft lining is higher than common concrete. Researching results have great significance in perfecting design theories of the new type of monolayer shaft lining and guiding it constructing fast and scientifically.