【摘 要】
：
为研究带裂隙的花岗岩残积土边坡在反复干湿循环作用下的响应规律,利用模型试验模拟干湿循环过程,通过处理裂隙图像量化裂隙宽度扩展,结合坡内土体直剪试验,推导强度衰减规律
【机 构】
：
厦门大学建筑与土木工程学院,福建厦门361005;福建省地质灾害重点实验室,福建福州 350002;厦门大学建筑与土木工程学院,福建厦门361005;厦门市交通基础设施智能管养工程技术研究中心,福建厦
论文部分内容阅读
为研究带裂隙的花岗岩残积土边坡在反复干湿循环作用下的响应规律,利用模型试验模拟干湿循环过程,通过处理裂隙图像量化裂隙宽度扩展,结合坡内土体直剪试验,推导强度衰减规律和裂隙深度相关的计算公式.对比模型试验和数值模拟结果,分析考虑裂隙发育下的残积土边坡响应情况,结果如下:干湿循环下残积土裂隙宽度扩展符合Logistic模型,裂隙深度与强度衰减有确定的量化关系,且随着干湿循环次数增加,裂隙深度趋于稳定;干湿循环次数较少时,坡底位置含水率变化明显滞后于坡顶和坡中位置,但随着干湿循环次数增加及裂隙扩展,边坡各位置的含水率变化趋于一致.裂隙扩展对边坡各位置变形均有影响,随着干湿循环次数增加,考虑裂隙扩展的坡底和坡中位置变形与不考虑裂隙的情况趋于一致,但坡顶区域变形更大,致使裂隙边坡的坡顶与坡底的变形差距增加.
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