塑料土工格栅拉伸特性试验研究  

Experimental study of tensile properties of geogrids

作　　者：杨广庆[1] 庞巍[1] 吕鹏[1] 周乔勇[1] 

机构地区：[1]石家庄铁道学院土木分院,河北石家庄050043

出　　处：《岩土力学》2008年第9期2387-2391,共5页Rock and Soil Mechanics

基　　金：河北省自然科学基金资助项目。(No.E2006000393)

摘　　要：进行土工格栅加筋土结构现场试验时,如何将实测应变有效地转换成拉应力对正确分析结构的作用机制具有重要影响。通过室内试验,研究了不同拉伸速率对3种强度的HDPE土工格栅拉伸性能的影响。试验结果表明:土工格栅的拉伸强度和拉伸模量随拉伸速率的降低而降低,峰值应变随拉伸速率的降低而增加。土工格栅强度越高,受拉伸速率的影响越小。在特定的拉伸速率条件下,同一种土工格栅对应2%,5%,10%应变和峰值应变的拉伸强度依次增大,而拉伸模量却依次减小。试验结果具有较强的实用价值。In the geogrids reinforced soil structure field test, availably convert the measure strain to tensile stress is very important. This can help to analyze the mechanism of action accurately. Through the indoor tests, the tensile properties of three HDPE geogrids with different strain rates are studied in this paper. It is concluded that the tensile strength and tensile modulus will decrease with the decrease of tensile rate; and the peak strain decreases with the decrease of the tensile rate. The strain rate will have smaller influence on the higher strength geogrids. In the specifical tensile rate, The tensile strength corresponding to 2%, 5%, 10% and peak strain increase in turn, the tensile modulus reducing in turn.

关 键 词：土工格栅 拉伸特性 室内试验 强度 模量 

分 类 号：TU472[建筑科学—结构工程]