水利水电科技进展
水利水電科技進展
수이수전과기진전
Advances in Science and Technology of Water Resources
2015年
6期
86-89
,共4页
黏土%断裂韧度%三点弯曲试验%干密度%含水率
黏土%斷裂韌度%三點彎麯試驗%榦密度%含水率
점토%단렬인도%삼점만곡시험%간밀도%함수솔
clay%fracture toughness%three-point bending test%dry bulk density%moisture content
为研究击实黏土干密度、含水率对其断裂韧度的影响，把标准三点弯曲试验试样绕底部长边向前旋转90°，加载方向随之变为水平方向，使荷载的方向与重力方向垂直，从而消除自重对裂隙向土梁厚度、长度方向扩展的影响。对重庆地区罗系地层中的黏土岩风化形成的高塑限黏土进行了室内黏土Ⅰ型断裂韧度试验，总结了干密度、含水率对黏土断裂韧度的影响规律，结果表明，黏土Ⅰ型断裂韧度随其干密度的增大而增大，随其含水率的增大先增大后减小；存在一个最优含水率，此时断裂韧度取得最大值。
為研究擊實黏土榦密度、含水率對其斷裂韌度的影響，把標準三點彎麯試驗試樣繞底部長邊嚮前鏇轉90°，加載方嚮隨之變為水平方嚮，使荷載的方嚮與重力方嚮垂直，從而消除自重對裂隙嚮土樑厚度、長度方嚮擴展的影響。對重慶地區囉繫地層中的黏土巖風化形成的高塑限黏土進行瞭室內黏土Ⅰ型斷裂韌度試驗，總結瞭榦密度、含水率對黏土斷裂韌度的影響規律，結果錶明，黏土Ⅰ型斷裂韌度隨其榦密度的增大而增大，隨其含水率的增大先增大後減小；存在一箇最優含水率，此時斷裂韌度取得最大值。
위연구격실점토간밀도、함수솔대기단렬인도적영향，파표준삼점만곡시험시양요저부장변향전선전90°，가재방향수지변위수평방향，사하재적방향여중력방향수직，종이소제자중대렬극향토량후도、장도방향확전적영향。대중경지구라계지층중적점토암풍화형성적고소한점토진행료실내점토Ⅰ형단렬인도시험，총결료간밀도、함수솔대점토단렬인도적영향규률，결과표명，점토Ⅰ형단렬인도수기간밀도적증대이증대，수기함수솔적증대선증대후감소；존재일개최우함수솔，차시단렬인도취득최대치。
In order to investigate the effects of the dry bulk density and moisture content on the fracture toughness of compacted clay, a new method for the three-point bending test was used, in which the testing sample was rotated 90° in forward around its long side at the bottom, and the loading direction was thus turned to the horizontal direction, perpendicular to the direction of the gravity of the testing sample, so as to avoid the influence of its self-gravity on the fracture extending along the thickness and length of the soil beam. Laboratory tests on the I-type fracture toughness of high-plasticity compacted clay formed by rock weathering in the Jurassic formation in Chongqing City show that the fracture toughness of compacted clay increases with the dry bulk density, and that it increases first and then decreases with the increase of the moisture content, with an optimum moisture content existing, corresponding to the greatest fracture toughness.
