TY - JOUR A2 - Biondi, AU - Zhang, Zhen AU - Chen，中大PY - 2019 DA - 2019/02/14 TI -数值模拟的基岩下垂灰岩坑在岩石应变软化引起的路堤建设SP - 9426029六世- 2019 AB -基岩下垂天坑时发生在中国的江西省建设上面的昌黎高速公路浅层岩溶洞穴。并以其为例，对其失效机理和潜在的演化进行了研究。对研究区地应力进行了测量和数值模拟。通过室内试验获得了Hoek-Brown强度参数。根据试件在三轴试验中表现出的应变软化特性，建立了应变软化本构模型。用数值方法再现了试样的应力-应变曲线。在此基础上，模拟了路堤施工引起的应变软化岩中基岩下沉沉陷洞。观察了应变软化区的出现及其向残余区转变的过程，并将其分为四个阶段。分析了四个阶段的应力路径。 Interestingly, in this case, the supports at both ends of the bedrock began to yield from the top and extended downward, while the midspan position began to yield from the bottom and extended upward, and the reasons for yielding were related to tension. Further analysis found that the failure mode was basically consistent with the size and direction of the bending moment. In fact, this failure mode was quite similar to a fixed supported beam. Then, the feasibility of calculating the stability of karst caves based on beam assumptions was discussed. Finally, potential evolution of the bedrock sagging sinkhole was discussed. SN - 1687-8086 UR - https://doi.org/10.1155/2019/9426029 DO - 10.1155/2019/9426029 JF - Advances in Civil Engineering PB - Hindawi KW - ER -