【作者】 沈家军；

【导师】 何小元；

【作者基本信息】 东南大学 ， 固体力学， 2005， 硕士

【摘要】 在我国沿海地区,往往存在厚度不等,承载力较低的高压缩性的淤泥或者淤泥质土,呈软塑性,力学强度极差,根本没有浅部天然持力层存在,在这种软弱地基上修建公路若处理不当,极可能造成路基的破坏从而影响公路的正常运营。因此,对于这些路段而言,公路路基的加固显得异常重要。但是对于这些公路路基而言,除了用最合适的加固方法以外,还必须能够用简单易行的方法对加固后的路基土体位移进行测量,比较准确地了解土体的沉降和横向挤压,这样无论对于公路的建设还是对于建成后的运营和养护,都是至关重要的。本实验的土体属于软土的范畴,对于这种类型的地基,加固方法较多,如夯实法,堆载预压法等。但是由于湿喷桩具有明显的优点,因此采用了这种方法来处理软弱地基。关于土体位移的测量,虽然目前已经出现了一些测量方法,但是对于本实验室模拟实验而言,总存在某种方面的不足。例如位移传感器法虽然简洁直观,但是由于造价太高,因此显得不够经济。另外测斜仪虽然测量原理简单,但是难以满足各个测点变形的同时性,因此不够理想。最后考虑到位移和曲率半径之间存在函数关系,而各点曲率半径和应变的函数关系可以通过标定的方法来得到,从而建立起了应变和位移之间的关系。应变的数据可以通过应变片的测量来测得,最后通过各个典型点的应变数据可以求得相应点的位移。而静载作用下表面位移的测量是通过三维立体视觉的方法,通过两台摄像机所拍摄的图片,经过转换矩阵的处理求得位移。论文最终求得了各个典型点的位移,并且分析了不同时间以及不同位置的典型点位移的变化规律,从而可以为实际施工提供参考数据。更多还原

【Abstract】 In the areas near ocean and river, there are silt layers of different depth, highly depressed, having low natural bearing capacity and presenting plastic features. Building highways on this soft subgrade without proper disposal probably lead to the great damage and influence the normal usage. so the reinforcement of highway subgrade plays a very important role.To this kind of soft subgrade, it is necessary not only to choose the proper method to reinforce the foundation, but also to measure the displacement of the surrounding clay-mass. The above two aspects take an important place not only in the building course, but also in the usage and conservation course.There are various ways to reinforce the soft subgrade, but wet jet mixing pile have some obvious advantages, so it is wise to choose this method. Of course, there are also several ways to measure the clay-mass displacement, but they all have some defects, such as expensive or not synchronous. But displacement has functional relations with curvature radius, and it is possible to build a relation between curvature radius and strain through experimentation, so it is convenient to build a function between strain and displacement. During the perfusion course, strain guage can reveal the data of strain, so the amount of displacement can be obtained. During the static load course, the surface displacement can be measured by the stereo vision method through two cameras.After getting a great deal of useful data, the principal of the displacement in different times and in different locations can be obtained by drawing displacement curves, consequently the experimentation can provide useful data for actual construction.更多还原