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1、前言有关以隧道工程为对象的地质调查的种类及其进展方面,已经在本刊报告过了。但是,这些是以自然地基为对象的调查方法。在有已建结构物等的城区地下的构筑物或采掘过的地方这类特殊条件下,施工隧道时这些调查方法不一定是很有效的。在上述环境下施工隧道时,作为希望事先掌握的调查对象物可考虑为如表—1。这样,有必要知道从地面不容易确定的地下结构物或空洞等地质缺陷的位置、状态,对原有结构物
1. Preface The types of geological surveys targeted at tunnel projects and their progress have been reported in this publication. However, these are survey methods for natural grounds. Under special conditions such as underground structures or excavated areas in urban areas such as constructed structures, these survey methods are not necessarily effective when constructing tunnels. When constructing a tunnel in the above environment, it is considered that Table 1 should be considered as an object to be surveyed. In this way, it is necessary to know the position and state of geological defects such as underground structures or voids that are not easily determinable from the ground, and to the original structures.