泥质板岩的岩性特征与基坑支护优化

Characterization of Argillaceous Slate and Optimization of Supporting System for a Deep Excavation

泥质板岩是典型的一类软岩,在长沙地区较为常见,其岩性特征及地层特点是造成某些工程变形、产生安全隐患的主要原因。以长沙市岳麓区某泥质板岩基坑工程为例,阐述了泥质板岩基坑的地层岩性特征,对原桩锚支护方案进行了优化设计,并对基坑最危险剖面进行了变形判定分析。基坑边坡的监测数据表明:基坑支护方案优化后,整体形变量满足设计要求。

Argillaceous slate is a typical soft rock which is commonly encountered in urban Changsha area. The stratigraphie and lithologic characteristics of the slate might also be the main sources of the construction safety hazard. This paper presents a case study of the deep excavation project within the argillaceous slate soft rock. The subsurface lithology is briefly introduced and an improved design of the original soldier pile with the ground anchor is also presented. The deformation analysis was per- formed at the location with least safety factor. The construction monitoring data indicates that the deformation of the excavated area was satisfactory.