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以广明高速公路K54+300～K54+560区段路基沉陷工程物探为例,介绍采用高密度电法、等偏移距反射波法及多道瞬态面波法,勘探公路路基沉陷的方法技术。通过对各方法勘探成果综合分析,达到了勘探目的。本次工程物探表明,综合物探方法在划分岩溶发育不稳定区、软土的分布区域及路基的沉陷勘探等方面,具有快速、经济和成果直观的特点。本文同时分析了路基沉陷产生的原因。
Taking the geophysical engineering of subgrade settlement in K54 + 300 ~ K54 + 560 section of Guangming Expressway as an example, the method of exploring the subgrade settlement of highway subgrade by using high density electrical method, offset wave reflection method and multi-channel transient surface wave method technology. Through the comprehensive analysis of various methods of exploration results, reached the purpose of exploration. Geophysical prospecting of this project shows that the comprehensive geophysical prospecting method has the characteristics of quickness, economy and intuitionistic achievements in the division of unstable areas of karst development, the distribution of soft soil and the subsidence exploration of subgrade. This paper also analyzes the causes of roadbed settlement.