CAJ | 학술논문

溪洛渡—浙西±800 kV特高压直流输电线路经过的湘西地区交通极为不便，地形起伏较大，地质条件复杂，在这一地区开展工程钻探工作，困难重重。初勘资料表明，线路经过的灰岩区，岩溶发育强烈，对塔基稳定构成安全威胁，同时线路经过的砂岩区中部分塔基覆盖粘土层中含有风化碎屑，普通麻花钻难以准确判定覆盖层厚度。为了查明塔基下方岩溶发育情况，基岩面埋深等工程地质问题，经综合试验比选，采用地质雷达进行探测。岩溶探测过程中除了地面工作外，为了进一步查清桩孔基底之下至少5m以内的岩溶情况，还进行了桩底探测。钻探及施工开挖结果表明地质雷达能有效探查地下隐伏岩溶、基岩面、风化带、断裂及破碎带等，为合理选择塔位、设计基础深度提供了科学依据，取得了良好的应用效果。
계락도—절서±800 kV특고압직류수전선로경과적상서지구교통겁위불편，지형기복교대，지질조건복잡，재저일지구개전공정찬탐공작，곤난중중。초감자료표명，선로경과적회암구，암용발육강렬，대탑기은정구성안전위협，동시선로경과적사암구중부분탑기복개점토층중함유풍화쇄설，보통마화찬난이준학판정복개층후도。위료사명탑기하방암용발육정황，기암면매심등공정지질문제，경종합시험비선，채용지질뢰체진행탐측。암용탐측과정중제료지면공작외，위료진일보사청장공기저지하지소5m이내적암용정황，환진행료장저탐측。찬탐급시공개알결과표명지질뢰체능유효탐사지하은복암용、기암면、풍화대、단렬급파쇄대등，위합리선택탑위、설계기출심도제공료과학의거，취득료량호적응용효과。
Xiluodu-Zhexi ± 800 kV UHV DC transmission line through the Xiangxi area where the trafifc is very inconvenient, the surface is undulating and the geological conditions is complex, engineering drilling work carried out in this region is very difficult. Preliminary exploration data show that at the limestone area karst development is strongly, tower pad stability are facing security threats, while at the sandstone District the covering clay layer containing weathered debris, ordinary twist drill is dififcult to accurately determine the coveragelayer thickness. In order to check the karst development situation and the bedrock surface depth, we decided to use the ground penetrating radar to detection afther the test demonstration. In addition the ground penetrating radar detection work on the ground, we also carried out the pile bottom detection in order to further investigate the karst development less than 5m under the bottom of the hole. Drilling and excavation results show that the ground penetrating radar can effective detecting the hidden karst,bedrock surface ,weathered zone, fracture and fracture zone, it provides a scientiifc basis for reasonable choice tower bit and design foundation depth, also it achieved a good application effect.