CAJ | 학술논문

土工膜焊缝剪切强度是整个防渗结构可靠性保障的关键因素之一。为了得到充气时间和充气压强对土工膜焊缝质量的影响，本文选择七种不同厚度的HDPE土工膜在不同充气时间和充气压强条件下进行焊缝剪切强度试验。试验结果表明：相同充气时间和充气压强条件下，土工膜焊缝剪切强度随着土工膜厚度的增加而增大，且曲线变化几乎一致；无论充气压力多少，充气时间长短，相同土工膜厚度试验条件下，不同厚度的HDPE土工膜在焊缝剪切强度方面表现出良好的稳定性，所有试验组的焊缝剪切强度值大小及其变化相近，剪切强度变化系数最大为6.72%，最小为0.81%，充气压力和充气时间对土工膜焊缝剪切强度影响很微小；土工膜焊缝剪切破坏主要发生在焊缝区域与土工膜母材的连接处薄弱部位，应当引起重视。
토공막한봉전절강도시정개방삼결구가고성보장적관건인소지일。위료득도충기시간화충기압강대토공막한봉질량적영향，본문선택칠충불동후도적HDPE토공막재불동충기시간화충기압강조건하진행한봉전절강도시험。시험결과표명：상동충기시간화충기압강조건하，토공막한봉전절강도수착토공막후도적증가이증대，차곡선변화궤호일치；무론충기압력다소，충기시간장단，상동토공막후도시험조건하，불동후도적HDPE토공막재한봉전절강도방면표현출량호적은정성，소유시험조적한봉전절강도치대소급기변화상근，전절강도변화계수최대위6.72%，최소위0.81%，충기압력화충기시간대토공막한봉전절강도영향흔미소；토공막한봉전절파배주요발생재한봉구역여토공막모재적련접처박약부위，응당인기중시。
Geomembrane welding seam shear strength is one of the key factors for the impervious structure reliability. In order to get the effect of air inflation time and air inflation pressure on geomembrane seam, in this paper, seven different thickness kinds of HDPE geomembrane were selected to make the welding seam shear strength test at different aeration time and filling pressure conditions. The test results show that:Under the test condition of the same air inflation time (3 min or 10min) and the same air inflation prssure (0. 1 MPa or 0. 2MPa), geomembrane welding seam shear strength increases with the air inflation stress increasing, curves ran almost unanimously; no matter how much the air inflation pressure is and how long the aeration time is, HDPE geotechnical membrane of different thickness show good stability in weld shear strength. All experimental group weld shear strength and its changing trend is similar. The largest coefficient of variation is 6. 72%, the minimum is 0 . 81%, the effect of air inflation pressure and time on HDPE geomembrance weld shear strength is very small;geomembrane weld shear failure occurs at the weak zone junction of weld area and geotechnical film base material, more attention should be paid to.