CAJ | 학술논문

为研究加筋粗粒土填料的强度变形特性及加筋效果,进行加筋强风化软岩粗粒土固结不排水和固结排水大三轴试验.试验表明:加筋填料的应力-应变关系表现为应变硬化型;轴向应变较小(ε_a＜1%)时,加筋填料效果不明显,随着轴向应变的逐渐增大加筋效果逐渐发挥.加筋填料的孔隙水压力均高于素填料,随着加筋层数的增加均有不同程度的提高.加筋效果系数均＞1.0,一层加筋填料加筋效果系数为1.09～1.21,二层加筋填料加筋效果系数为1.30～1.71,三层加筋填料加筋效果系数为1.31～1.72.加筋前后填料的内摩擦角(基本不变,填料的黏聚力增大.加筋填料的本构关系可以用Duncan-Chang模型来描述,依据试验结果求得模型参数.
위연구가근조립토전료적강도변형특성급가근효과,진행가근강풍화연암조립토고결불배수화고결배수대삼축시험.시험표명:가근전료적응력-응변관계표현위응변경화형;축향응변교소(ε_a＜1%)시,가근전료효과불명현,수착축향응변적축점증대가근효과축점발휘.가근전료적공극수압력균고우소전료,수착가근층수적증가균유불동정도적제고.가근효과계수균＞1.0,일층가근전료가근효과계수위1.09～1.21,이층가근전료가근효과계수위1.30～1.71,삼층가근전료가근효과계수위1.31～1.72.가근전후전료적내마찰각(기본불변,전료적점취력증대.가근전료적본구관계가이용Duncan-Chang모형래묘술,의거시험결과구득모형삼수.
In order to study the strength and deformation properties of soft rock composed of coarse-grained soil,as well as its reinforcement effect as fillings,large-scale consolidated drained and undrained triaxial tests are carried out for reinforced intense-weathered rock. The results show that the stress-strain relationship of geotextile-reinforced fillings is of strain hardening. The geotextile-reinforced fillings have little effect while the triaxial strain is less than 1%,and the reinforcing effect becomes more remarkable with the increase of triaxial strain. The pore water pressures of geotextile-reinforced soil samples are higher than those of pure coarse-grained soil samples;and they increase with the increase of geotextile layers. The coefficients of reinforcing effect are all more than 1.0,being 1.09-1.21 while with one layer of geotextile;1.30-1.71 with two layers of geotextile and 1.31-1.72 with three layers of geotextile. The internal friction angle ψ of fillings before and after reinforcements is nearly constant,while the cohesion force of the fillings increases with the increase of geotextile layers. The constitutive relation can be described with the Duncan-Chang model;and the parameters of Duncan-Chang model for geotextile-reinforced soil are obtained through tests.