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研究目的:既有线路基常利用打桩等措施进行病害治理,受混凝土轨道板、轨上物体及运营安全的限制,传统检测方法在高速铁路上难以进行加固效果的检测。本文针对该难题提出一种路基无损检测新思路,从路基左、右两侧对路基本体进行地震波透射成像研究,并在路基打桩加固后进行地震波透射、钎探和E_(vd)测试等多方法的综合试验,以检验该方法在路基无损检测中的效果,从而为高速铁路路基的检测提供有效帮助。研究结论:(1)本文提出的路基侧向无损检测方法可获得路基本体内多个岩土体弹性力学参数的分布图像,如纵横波速、泊松比和弹性模量,之后利用这些参数可以更好地去判断路基本体的状态,尤其可在现场实时获取路基本体内各个位置的土体泊松比,无需再取样进行室内化验,便于判断路基内土质及土体软硬分布情况;(2)通过在实际路基模型上进行地震波透射、钎探、E_(vd)测试及开挖等方法证明:本文提出的路基侧向地震波透射检测方法可以有效反映路基内桩的延伸方向及周围介质强度等信息,从而为路基评价提供详细信息;(3)本文提出的路基侧向地震波透射法可用于高速铁路路基无损检测工作,无需上道,大幅降低了安全隐患,可为路基维护及加固提供有效帮助,对于类似情况下的铁路路基检测具有指导意义。
Research purposes: Existing lines often use piling and other measures to carry out disease control and are limited by the safety of concrete track plates, rail objects and operations. The traditional detection methods are difficult to detect the reinforcement effect on high-speed railway. In this paper, a new idea of non-destructive testing of subgrade is put forward. From the left and right sides of the subgrade, seismic transmission imaging is carried out. After the subgrade is piled and reinforced, many methods such as seismic transmission, brazing and E_ (vd) In order to test the effect of this method in nondestructive testing of subgrade so as to provide effective help for the detection of high speed railway subgrade. The conclusions are as follows: (1) The lateral subgrade damage detection method proposed in this paper can obtain distribution images of elastic mechanics parameters of rock and soil mass in roadbed, such as P-wave velocity, Poisson’s ratio and elastic modulus, and then use these parameters So as to judge the state of roadbed well in particular. In particular, the Poisson’s ratio of soil in every position within the roadbed can be obtained in real time, so it is convenient to judge the distribution of soil and soil soft and hard within the subgrade without re-sampling. Through the methods of seismic wave penetration, soldering, E_ (vd) testing and excavation on the actual subgrade model, it is proved that the method of subgrade lateral seismic transmission detection proposed in this paper can effectively reflect the information about the extending direction of subgrade and the surrounding medium strength So as to provide detailed information for subgrade evaluation. (3) The subgrade lateral seismic wave transmission method proposed in this paper can be used for non-destructive testing of high speed railway subgrade without going on the road, greatly reducing the potential safety hazard and providing effective help for subgrade maintenance and reinforcement. For similar cases of railway subgrade detection is instructive.