混凝土
混凝土
혼응토
CONCRETE
2014年
8期
30-34
,共5页
真三轴%共线三裂纹%裂纹倾角%裂纹扩展%侧压力
真三軸%共線三裂紋%裂紋傾角%裂紋擴展%側壓力
진삼축%공선삼렬문%렬문경각%렬문확전%측압력
true triaxial%three collinear cracks%crack orientation%crack propagation%lateral confining stress
采用真三轴加载装置，试验研究了共线裂纹倾角和侧压力对试件强度和裂纹扩展规律的影响。试验所用材料为水泥砂浆，试件为带有预制贯穿共线裂纹的方形平板。同时为了定性地解释试验结果，采用了ABAQUS软件进行了数值模拟研究，试验和数值模拟结果相吻合。研究结果表明：裂纹倾角对于试件的强度有显著影响，大约在45°时其强度最低；围压对于试件的抗压强度具有显著的影响作用，其抗压强度随着围压的增大而增大，在低围压作用下次生裂纹从原始预制裂纹的尖端以较大的起裂角开始扩展，而高围压下裂纹的扩展更容易以平行于轴方向扩展。
採用真三軸加載裝置，試驗研究瞭共線裂紋傾角和側壓力對試件彊度和裂紋擴展規律的影響。試驗所用材料為水泥砂漿，試件為帶有預製貫穿共線裂紋的方形平闆。同時為瞭定性地解釋試驗結果，採用瞭ABAQUS軟件進行瞭數值模擬研究，試驗和數值模擬結果相吻閤。研究結果錶明：裂紋傾角對于試件的彊度有顯著影響，大約在45°時其彊度最低；圍壓對于試件的抗壓彊度具有顯著的影響作用，其抗壓彊度隨著圍壓的增大而增大，在低圍壓作用下次生裂紋從原始預製裂紋的尖耑以較大的起裂角開始擴展，而高圍壓下裂紋的擴展更容易以平行于軸方嚮擴展。
채용진삼축가재장치，시험연구료공선렬문경각화측압력대시건강도화렬문확전규률적영향。시험소용재료위수니사장，시건위대유예제관천공선렬문적방형평판。동시위료정성지해석시험결과，채용료ABAQUS연건진행료수치모의연구，시험화수치모의결과상문합。연구결과표명：렬문경각대우시건적강도유현저영향，대약재45°시기강도최저；위압대우시건적항압강도구유현저적영향작용，기항압강도수착위압적증대이증대，재저위압작용하차생렬문종원시예제렬문적첨단이교대적기렬각개시확전，이고위압하렬문적확전경용역이평행우축방향확전。
Experimental study on the fracture property of three collinear cracks concrete specimens under compression was implemented by using a uniaxial loading system and a self-made lateral loading device.The specimens were a square plate and made of cement ,sand and water.The relations of fracture property for the specimens with different crack orientation and the lateral confining stress were investigated. At the same time,in order to explain the experimental result qualitatively,numerical simulation technology based on ABAQUS was used, the simulation results are in accord with the experimental results.The results showed that the crack angle had a great influence on the strength,which was the lowest when the crack angle was approximately;the confining pressure had significant influence on the compres-sive strength of specimens,the compressive strength increased with confining pressure,under low confining pressure next crack from the original crack tip with a large angle of crack initiation and propagation began to expand ,crack under high confining pressure more easily in parallel in the axial direction of expansion.
