【作者】 马亮；

【导师】 高波；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 离心模型试验技术是目前在土木工程领域内进行科学研究竞相采用的一项新的试验技术，其优点是能在原型应力状态下研究和观察岩土工程的变形状态和破坏过程。 本文首先全面总结了离心模型试验技术的发展历史及应用现状，系统阐述了离心模型试验技术的基本原理。为了探讨离心模型试验技术这一研究手段在地下工程中应用的可行性，结合地质、水文、结构较为复杂的深圳地铁大～科区间暗挖施工SK3+355断面的具体实例，应用我校新近建成的100gt土工离心试验机，采用离心模型试验技术对在富水地层应用水平旋喷桩工艺进行控制降水施工对地表沉降变形及地下管线的影响进行了研究。得到了以深圳地铁富水地层控制降水隧道开挖施工地表沉降槽曲线变化规律，并经过基于ANSYS有限元计算平台进行的数值模拟计算和现场实际监测结果的验证，结果令人满意。离心模型试验技术较好的解决了在地下工程研究中模型土体的自重损失和地层位移分析中地下水渗流场和地层应力场相互耦合作用问题，对于在相似条件下富水地层隧道开挖施工如何控制地表沉降变形的研究方面具有指导意义。并针对动态模拟隧道开挖这一难题利用离心模型对深圳地铁SK3+395断面进行了尝试性的研究，取得了一定的进展。论文最后指出了离心模型试验技术目前存在的一些问题和今后的发展趋势和研究方向。更多还原

【Abstract】 Centrifuge model test is a technique that is widely used in the research field of Civil Engineering. One of its most distinct advantages is that the process of deforming and being destroyed of the soil can be observed with prototype. At first, this thesis summarizes the developing history and the state-of-the-art in centrifuge model test and discusses the principle of the technique of the centrifuge model test. To discuss the feasibility of applying this technique into the practice of engineering, this paper references the real project of the running tunnel from Great Showplace to Scientific House in Shenzhen Metro, uses the geotechnical centrifuge of Southwest Jiaotong University, then researches the settlement of the ground and the influence on the pipeline underground in stratum with abundant water by the technique of undraining spin-spay pile, at last draws a conclusion about the principle of the ground settlement with the construction method of excavating soil rich in water without dewatering at Shenzhen Metro. The result is satisfying comparing to the simulation of ANSYS5.6 and the data from the field. Centrifuge model test technique preferably solves two problems: one is the gravity loss of the model soil, the other is the coupling problem between the seepage field of the ground water and the stress field of the stratum, which is a guidance for other deformation controls under the similar condition. On the puzzle of dynamic simulation of tunnel excavation with centrifuge model, this thesis makes a trial research on the section of SK3+395 of Shenzhen Metro and has made some progress. At last, this thesis points out some problems existing in the centrifuge model test technique and estimates the developing trend of this technique.更多还原