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随着国民经济的飞速发展,在软土地基上修建的公路数量越来越多。软土地基上公路桥涵、路堤的设计与施工方案的选择,来源于工程地质勘察资料。因此,选择适宜的勘察方法,对软土地基作出正确的评价与预测,提出有效的地基处理措施,为施工图设计提供可靠的依据至关重要。大量的公路勘测实践已证明,光凭钻探取样是难以取得确切的力学指标的,因为公路钻孔勘探点间距较远,多大于l00m,且试样经过现场采取、搬运、实验试样制备等诸多因素的影响产生扰动,从而直接影响到试验结果。有些力学指标与实际原状土的性质偏差较大,必须用原位测试和钻探相结合的综合勘察手段,互相验证对照,提供设计所需的参数。现根据昆山中环快速化工程-中环南线(G312)工程的工程地质勘察实践,共同探讨第四系全新统新近沉积的软土地基的勘察方法和对软土地基进行初步评价。
With the rapid development of the national economy, the number of highways built on soft soil bases is increasing. The selection of design and construction schemes for bridges and culverts and embankments on soft soil foundation come from engineering geological survey data. Therefore, it is of vital importance to select the appropriate survey method to make the correct evaluation and prediction of the soft soil foundation and to put forward the effective foundation treatment measures to provide a reliable basis for the construction drawing design. A large number of highway survey and practice have proved that it is difficult to obtain the exact mechanical index just because of drilling sampling because the distance between the drilling points of highway drilling is much longer than l00m and the samples are taken on the spot and handled and the preparation of experimental samples The influence of factors has a disturbance, which will directly affect the test results. Some mechanical indicators deviate from the actual nature of undisturbed soil. It is necessary to verify the comparison with each other by means of comprehensive surveying combined with in situ testing and drilling to provide the required parameters for the design. According to the Kunshan Central rapidization project - Central South Line (G312) project geological prospecting practice to discuss the Quaternary Allied Xinxu newly deposited soft soil foundation survey methods and preliminary evaluation of soft ground.