广西大学学报（自然科学版）
廣西大學學報（自然科學版）
엄서대학학보（자연과학판）
JOURNAL OF GUANGXI UNIVERSITY （NATURAL SCIENCE EDITION）
2014年
2期
231-236
,共6页
姚直书%薛维培%宋海清%邓昕
姚直書%薛維培%宋海清%鄧昕
요직서%설유배%송해청%산흔
富水性%松软岩层%冻结法凿井%井壁结构%模型试验
富水性%鬆軟巖層%凍結法鑿井%井壁結構%模型試驗
부수성%송연암층%동결법착정%정벽결구%모형시험
water enrichment%soft rock%freezing shaft-sinking method%shaft lining structure%model test
为解决我国西北地区富水松软岩层冻结井筒的支护难题，通过结构模型试验，对冻结井壁的力学特性进行了系统研究。首先推导了井壁结构模型试验的相似准则，据此进行了内、外层井壁的模型设计和试件加工；然后通过加载试验，得到了它们在水平荷载作用下的应力和强度特性。结果表明：高强钢筋混凝土内壁结构中的混凝土处于多轴受压应力状态下，变形受到约束作用明显，井壁结构中混凝土抗压强度比单轴抗压强度提高了1.562~1.831倍，使得井壁实际承载力得到了大幅度提高，并根据理论分析和试验结果推导出了这种井壁承载力的计算公式；外层井壁模型试件在加载破坏时，井壁结构中的混凝土极限压应力接近于混凝土单轴轴心抗压强度。建议在富水松软岩层冻结井壁结构强度计算中，应根据内、外壁结构中混凝土所处的受力状态来选用其强度值。
為解決我國西北地區富水鬆軟巖層凍結井筒的支護難題，通過結構模型試驗，對凍結井壁的力學特性進行瞭繫統研究。首先推導瞭井壁結構模型試驗的相似準則，據此進行瞭內、外層井壁的模型設計和試件加工；然後通過加載試驗，得到瞭它們在水平荷載作用下的應力和彊度特性。結果錶明：高彊鋼觔混凝土內壁結構中的混凝土處于多軸受壓應力狀態下，變形受到約束作用明顯，井壁結構中混凝土抗壓彊度比單軸抗壓彊度提高瞭1.562~1.831倍，使得井壁實際承載力得到瞭大幅度提高，併根據理論分析和試驗結果推導齣瞭這種井壁承載力的計算公式；外層井壁模型試件在加載破壞時，井壁結構中的混凝土極限壓應力接近于混凝土單軸軸心抗壓彊度。建議在富水鬆軟巖層凍結井壁結構彊度計算中，應根據內、外壁結構中混凝土所處的受力狀態來選用其彊度值。
위해결아국서북지구부수송연암층동결정통적지호난제，통과결구모형시험，대동결정벽적역학특성진행료계통연구。수선추도료정벽결구모형시험적상사준칙，거차진행료내、외층정벽적모형설계화시건가공；연후통과가재시험，득도료타문재수평하재작용하적응력화강도특성。결과표명：고강강근혼응토내벽결구중적혼응토처우다축수압응력상태하，변형수도약속작용명현，정벽결구중혼응토항압강도비단축항압강도제고료1.562~1.831배，사득정벽실제승재력득도료대폭도제고，병근거이론분석화시험결과추도출료저충정벽승재력적계산공식；외층정벽모형시건재가재파배시，정벽결구중적혼응토겁한압응력접근우혼응토단축축심항압강도。건의재부수송연암층동결정벽결구강도계산중，응근거내、외벽결구중혼응토소처적수력상태래선용기강도치。
Aiming at the support problems of frozen shaft in water-rich soft rock of northwest China, the mechanical characteristics of inner and outer shift lining was thoroughly studied by model tests. First, models of inner and outer shift lining were designed, and the specimens were manufactured according to the similarity criterion. Through a loading test, the stress and strength characteristics of inner and outer shift lining structures were obtained. The results indicate that the structure of high strength reinforced concrete inner shift lining is under tri-axial compressive stress state; the distor-tion is evidently restricted; the concrete compressive strength of the shaft lining structure increases 1.562~1.831 times higher than the monomial compressive strength;the actual carrying capacity is increased highly. A formula to calculate the ultimate bearing capacity of the shaft lining is given on the basis of theoretical research and the experimental results. When the specimens of the outer shift lining are loading to failure, the concrete utmost compressive stress of the shaft lining structure is close to the uniaxial axial compressive strength of the concrete. When calculating the strength of fro-zen shaft lining in water-rich soft rock, the strength of the concrete used in inner and outer shaft lin-ing structure should be chosen according to its stress state.
