饱和珊瑚砂体应变发展模式与预测模型试验研究OA北大核心CSTPCD

Address：No. 15, Fuxing Road, Haidian District, Beijing, P.R. China, 100038

珊瑚砂具有较好的排水条件,地震、波浪荷载作用下饱和珊瑚砂产生的排水变形易引起海床和附近结构物的破坏。利用GDS循环三轴仪,针对南沙岛礁饱和珊瑚砂试样进行了一系列循环排水加载试验,以探究细粒含量FC、相对密度D_r及循环应力比CSR对饱和珊瑚砂变形特性的影响。试验结果表明,饱和珊瑚砂的累积体应变ε_(vp)的发展速率和变形程度随FC、CSR的增大而增大,随D_(r)的增大而减小。饱和珊瑚砂ε_(vp)-N关系曲线呈现出循环平稳和循环蠕变两种发展模式…NAPSTIC

Home王路阳;吴琪;周正龙;张鑫磊;王炳辉;陈国兴

[Objective] To clarify the species of Altenaria fungi causing black spot in the main pear producing areas of our country and their pathogenicity, and to provide a theoretical basis for formulating effective control measures. [Methods] Tissue isolation was collected from the main pear producing areas of our country, and the species identification and pathogenicity verification of the obtained strains were identified by combining morphology and molecular biology. [Result] A total of 405 Alternaria strains were obtained by tissue isolation and purification from pear producing areas in 14 provinces, autonomous regions and municipalities directly under the Central Government our country. Morphological observations and phylogenetic analysis of polygenes (ITS, GAP-DH, Alt al, TEF 1, endoPG, and His 3) showed that they belonged to six species of the genus Alternaria (4lternaria). Among them, there were 267 strains of Alternaria tenuissima, 115 strains of A. alternata, 14 strains of A. arborescens, 6 strains of A. gaisen, 2 strains of A. gossypina, and 1 strain of A. longipes. The results of inoculating the representative strains of these six species on the isolated leaves of P. emerald showed that they were all pathogenic, but there were differences between their pathogenicity. The results of inoculation on the isolated leaves of peach (Prunuspersica), kiwifruit (Actinidial chinensis) and citrus (Citrus reticutate) showed that these representative strains were pathogenic to peach and kiwifruit, but none of them could cause citrus disease. [Conclusion] There are six species of Alternaria fungi that cause pear black spot in our country, including A. tenuissinma, A. alternata, A. arborescens, A. gaisen, A. gossypina and A. longipes, among which A. tenuissima and A. alternata are the dominant species. They accounted for 65.9% and 28.4% of the total number of isolated strains, respectively. This study is the first report on the systematic identification of Ahernaria fungal species causing black spot in the main pear producing areas of our country.南京工业大学岩土工程研究所,江苏南京210009南京工业大学岩土工程研究所,江苏南京210009 北京工业大学城市建设学部,北京100124南京工业大学岩土工程研究所,江苏南京210009南京工业大学岩土工程研究所,江苏南京210009江苏科技大学土木工程与建筑学院,江苏镇江212100南京工业大学岩土工程研究所,江苏南京210009

Journal Name：土木建筑

Fund：珊瑚砂细粒含量累积体应变等效骨架孔隙比潜在破坏系数

Authors：《岩土工程学报》 2024 (9)

Pear, black spot, Alternaria, species identification, pathogenicityP.1965-1973,9

Subject：国家自然科学基金项目(52008206,51978317,52208349)江苏省研究生实践创新计划项目(SJCX23-0467)。

DOI：10.11779/CJGE20230522