CAJ | 학술논문

在房山区大董村拟建工程基坑开挖和CFG桩施工过程中，发现地层中存在空洞。为确保天然地基的安全，首先选定重点区域采用地质雷达探测异常区，然后采用钻探开挖手段进行确认。根据工地的地质情况，在选定的重点区域采用井字形与往返方式布设雷达测线34条。为准确了解雷达波对地下空洞的相应特征，按照与实际尺寸1∶20建立地下空洞模型，并运用Gprmax软件进行正演模拟，通过与现场实测剖面对比分析发现，空洞可造成雷达反射波同相轴不连续，且其波形呈现典型的双曲线形态。利用地下空洞在雷达剖面上响应特征，确定了工区内选定区域的空洞位置、大小及埋深，经开挖验证，解译结果可靠。根据解译结果绘制的场地内空洞异常分布图，为基础开挖、塔吊和桩基安全施工提供了依据。
재방산구대동촌의건공정기갱개알화CFG장시공과정중，발현지층중존재공동。위학보천연지기적안전，수선선정중점구역채용지질뢰체탐측이상구，연후채용찬탐개알수단진행학인。근거공지적지질정황，재선정적중점구역채용정자형여왕반방식포설뢰체측선34조。위준학료해뢰체파대지하공동적상응특정，안조여실제척촌1∶20건입지하공동모형，병운용Gprmax연건진행정연모의，통과여현장실측부면대비분석발현，공동가조성뢰체반사파동상축불련속，차기파형정현전형적쌍곡선형태。이용지하공동재뢰체부면상향응특정，학정료공구내선정구역적공동위치、대소급매심，경개알험증，해역결과가고。근거해역결과회제적장지내공동이상분포도，위기출개알、탑조화장기안전시공제공료의거。
During the foundation excavation and CFG piles construction for a proposed project in the Dadong Village, Fangshan Dis?trict, cavities have been found in strata. To ensure subsoil safety, the GPR has been selected to detect anomaly, then using drilling or ex?cavation means verifying in addition. According to geological status, in selected work site important area, adopted pound sign (#) shaped and round trip mode to lay out 34 GPR lines. For accurate understanding of radar beam response characteristics on under?ground cavity, in term of actual size 1∶20 established cavity model, applied GprMAX software to carry out forward modeling, through contrastive analysis with site measured section has found that cavities can make discontinuous radar reflection phase axes, and wave?forms present typical hyperbolic configuration. Applying response characteristics of underground cavity on radar section, determined cavity position, size and buried depth in work site selected area, after verification through excavation, determined the interpreted result is reliable. The work site cavity anomalies distribution map according to interpreted result has provided basis for foundation pit excava?tion, tower crane and pile foundation safe construction.