H-V加筋饱和砂土性状的三轴试验研究

进行了H-V（水平-竖向）加筋饱和砂土固结不排水三轴试验。加筋材料采用镀锌铁皮和有机玻璃两种不同材料，在不同竖筋高度、不同围压下共进行了44组试验，研究了加筋饱和砂土的应力-应变关系、孔压-应变关系、强度特性及破坏形态，探讨了不同加筋高度、不同围压及不同筋材对加筋饱和砂土强度的影响，同时比较了立体加筋与土工格室加筋的异同，对饱和紧砂的空化现象及其影响进行了分析。试验结果表明，相对于无筋土及传统的水平加筋土而言，其抗剪强度均有大幅度提高；尤其是镀锌铁皮加筋，不仅提高了饱和砂土的有效黏聚力，也提高了有效内摩擦角，同时改善了砂土的延性。

Triaxial tests on saturated sands reinforced with horizontal-vertical inclusions

A series of consolidated undrained triaxial tests were carried out on saturated sand reinforced with horizontal-vertical(H-V) inclusions of galvanized iron and perspex. The behavior of reinforced saturated sand was studied in terms of stress-strain relationship, pore pressures, shear strength of the soil and the failure situation of specimen. The influences of different vertical configurations of H-V reinforcing elements, confining pressures and reinforcing materials on the strength of reinforced saturated sand were discussed. The relationship between 3 dimensional reinforcing and geocell reinforcing was presented; and cavitation occurred in dilatant soils was discussed. It is shown that the peak deviator stress and shear strength at failure increase greatly for saturated sand reinforced with H-V elements as compared with unreinforced sand and sand reinforced with conventional horizontal inclusions, especially for those reinforced with galvanized iron sheet reinforcements. Meanwhile, reinforcements made of galvanized iron can improve the ductility of saturated sand.