水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2011年
4期
1-4,49
,共5页
饱水砂土%地震液化%大变形%机理
飽水砂土%地震液化%大變形%機理
포수사토%지진액화%대변형%궤리
saturated sand%earthquake liquefaction%large displacement%mechanism
饱水砂土地震液化大位移会对土工构筑物造成严重的危害,对其机理的把握是大位移预测的前提和基础。本文对饱水砂土进行了振动液化后的静扭剪及再固结试验,结果表明液化后静加载曲线可分为两段：低强度段、强度恢复段;低强度段的模量极低,在较小的剪应力作用下应变即迅速增长,强度恢复段试样的强度则逐步得到恢复。由液化后静加载应力应变曲线和再固结曲线之间的联系对大位移机理进行了分析,指出动加载阶段土体被振密使得其中孔隙水相对＂富余＂是静加载阶段特殊的应力应变关系及再固结体变特性的原因。
飽水砂土地震液化大位移會對土工構築物造成嚴重的危害,對其機理的把握是大位移預測的前提和基礎。本文對飽水砂土進行瞭振動液化後的靜扭剪及再固結試驗,結果錶明液化後靜加載麯線可分為兩段：低彊度段、彊度恢複段;低彊度段的模量極低,在較小的剪應力作用下應變即迅速增長,彊度恢複段試樣的彊度則逐步得到恢複。由液化後靜加載應力應變麯線和再固結麯線之間的聯繫對大位移機理進行瞭分析,指齣動加載階段土體被振密使得其中孔隙水相對＂富餘＂是靜加載階段特殊的應力應變關繫及再固結體變特性的原因。
포수사토지진액화대위이회대토공구축물조성엄중적위해,대기궤리적파악시대위이예측적전제화기출。본문대포수사토진행료진동액화후적정뉴전급재고결시험,결과표명액화후정가재곡선가분위량단：저강도단、강도회복단;저강도단적모량겁저,재교소적전응력작용하응변즉신속증장,강도회복단시양적강도칙축보득도회복。유액화후정가재응력응변곡선화재고결곡선지간적련계대대위이궤리진행료분석,지출동가재계단토체피진밀사득기중공극수상대＂부여＂시정가재계단특수적응력응변관계급재고결체변특성적원인。
The serious damages to geotechnical structures can be caused by the large displacement induced by earthquake liquefaction.The mechanism is the basis of prediction about earthquake-induced large deformation.Here,the laboratory tests are conducted to research the behavior of saturated sand after liquefaction.Test results show that the deformation curves could be divided into two sections,e.g.,low strength segment and strength recovery segment.Then the mechanism of large deformation after liquefaction is discussed based on the test results.It is pointed out from the discussion that the ＂surplus water＂ induced by vibration is the main reason of earthquake-induced large deformation.
