一、引言历来不少学者、专家均对杭州西湖复向斜的地质构造特征作过考察与鉴定。但在有关的论著中,多偏重于研究本区的褶皱和断层构造特征;而却很少有人对本区的构造裂隙进行过有系就的测量和专题探讨。笔者在观察测量了发育于复向斜不同构造部位中共约三十一个地段的各类裂隙面的性质与产状;并在野外初步查明各地段各类共轭X型剪切裂隙面的锐角指向及其相互交会关系情况下,试图应用乌尔夫球面投影网格的图解法,确定各地段三向应力主轴的近似定向;进而重建复向斜不同构造部位中各别地段的局部构造应力场与复向斜区域构造应力场之间的统一关系,以期能揭示复向斜各地段岩体在海西一印支期的构造形变过程和形变特征,厘定复向斜的构造裂隙系就,并借以查 I. Introduction Historically, many scholars and experts have inspected and identified the geological structural features of the West Lake synclinorium in Hangzhou. However, in the related works, more emphasis is placed on studying the fold and fault structure features of the area; however, few people have made systematic measurements and special discussions on structural fractures in this area. The author observed and measured the properties and occurrences of various types of fissure surfaces in about 31 areas of different tectonic parts of the syncline. In the field, various types of conjugate X-shaped shear fracture surfaces were initially identified Acute angle pointing and their mutual intersection relationship, trying to use the Wolff spherical projection grid diagram to determine the approximate orientation of the three-way stress spindle in each section; and then to rebuild the local tectonic stress in different sections of the syncline Field and synclinal tectonic stress field in order to reveal the tectonic deformation and deformation of the rock mass in the Hercynian-Indosinian epoch, and to determine the tectonic fracture system of the synclinorium, And to check