循环荷载下桩承加筋土复合地基模型试验研究
摘要
本文对桩承加筋土复合地基的工程应用发展和研究情况进行了回顾,并对作用机理、理论计算方法以及设计方法进行了总结归纳,通过模型试验对循环荷载下桩承加筋土复合地基性状进行了研究。
进行加载波形为矩形的循环荷载下桩承加筋土复合地基模型试验,研究了加载波形为矩形循环荷载作用下桩承加筋土复合地基的沉降发展情况,并得出了可用于估算后续循环荷载作用下复合地基沉降的计算经验公式;分析了峰值荷载、周期对沉降、桩土应力比、桩身轴力和土工格栅张拉力的影响,得出了沉降、桩土应力比、桩身轴力和土工格栅张拉力随这些参数的变化规律。
进行加载波形为三角形的循环荷载下桩承加筋土复合地基模型试验,研究了加载波形为三角形循环荷载作用下桩承加筋土复合地基的沉降发展情况,并得出了可用于估算后续循环荷载作用下复合地基沉降的计算经验公式;分析了垫层厚度、桩帽大小、桩间距、土工格栅层数及桩土刚度比对沉降、桩土应力比、桩身轴力和土工格栅张拉力的影响,得出了沉降、桩土应力比和桩身轴力随这些参数的变化规律。
This paper has summarized the improvement of project application and research situation of geogrid-reinforced and pile-supported composite foundation, generalized the mechanism of action,theoretical calculation methods and design methods. And its behavior is studied by model text under cyclic loading.
It has studied the settlement characteristics of the geogrid-reinforced and pile-supported foundation under cyclic loading of rectangular. and obtained a empirical formula to estimate the settlement of composite foundation under follow-up cyclic loading of rectangular. By analyzing the effects that peak load,cycle on the settlement, the stress ratio of the pile to the soil, pile axial force, the tension of geogrid of the geogrid-reinforced and pile-supported foundation, it is indicated the variation rule of the settlement, the stress ratio of the pile to the soil , pile axial force, the tension of geogrid with the variation of these parameters.
It has studied the settlement characteristics of the geogrid-reinforced and pile-supported foundation under cyclic loading of triangle. and obtained a empirical formula to estimate the settlement of composite foundation under follow-up cyclic loading of triangle. By analyzing the effects that cushion thickness,the size of pile cap ,pile spacing, geogrid layers , the stiffness ratio of the pile to the soil on the settlement , the stress ratio of the pile to the soil , pile axial force, the tension of geogrid of the geogrid-reinforced and pile-supported foundation, it is indicated the variation rule of the settlement , the stress ratio of the pile to the soil , pile axial force, the tension of geogrid with the variation of these parameters.
进行加载波形为矩形的循环荷载下桩承加筋土复合地基模型试验,研究了加载波形为矩形循环荷载作用下桩承加筋土复合地基的沉降发展情况,并得出了可用于估算后续循环荷载作用下复合地基沉降的计算经验公式;分析了峰值荷载、周期对沉降、桩土应力比、桩身轴力和土工格栅张拉力的影响,得出了沉降、桩土应力比、桩身轴力和土工格栅张拉力随这些参数的变化规律。
进行加载波形为三角形的循环荷载下桩承加筋土复合地基模型试验,研究了加载波形为三角形循环荷载作用下桩承加筋土复合地基的沉降发展情况,并得出了可用于估算后续循环荷载作用下复合地基沉降的计算经验公式;分析了垫层厚度、桩帽大小、桩间距、土工格栅层数及桩土刚度比对沉降、桩土应力比、桩身轴力和土工格栅张拉力的影响,得出了沉降、桩土应力比和桩身轴力随这些参数的变化规律。
This paper has summarized the improvement of project application and research situation of geogrid-reinforced and pile-supported composite foundation, generalized the mechanism of action,theoretical calculation methods and design methods. And its behavior is studied by model text under cyclic loading.
It has studied the settlement characteristics of the geogrid-reinforced and pile-supported foundation under cyclic loading of rectangular. and obtained a empirical formula to estimate the settlement of composite foundation under follow-up cyclic loading of rectangular. By analyzing the effects that peak load,cycle on the settlement, the stress ratio of the pile to the soil, pile axial force, the tension of geogrid of the geogrid-reinforced and pile-supported foundation, it is indicated the variation rule of the settlement, the stress ratio of the pile to the soil , pile axial force, the tension of geogrid with the variation of these parameters.
It has studied the settlement characteristics of the geogrid-reinforced and pile-supported foundation under cyclic loading of triangle. and obtained a empirical formula to estimate the settlement of composite foundation under follow-up cyclic loading of triangle. By analyzing the effects that cushion thickness,the size of pile cap ,pile spacing, geogrid layers , the stiffness ratio of the pile to the soil on the settlement , the stress ratio of the pile to the soil , pile axial force, the tension of geogrid of the geogrid-reinforced and pile-supported foundation, it is indicated the variation rule of the settlement , the stress ratio of the pile to the soil , pile axial force, the tension of geogrid with the variation of these parameters.
引文
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