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岩土工程设计过程中选取的土层参数一般通过室内试验获得,由于试验条件、试验方法等方面的原因,其试验结果往往具有离散性,与真实值存在一定差异.本文以昆明地铁2号线区间内的上下接近盾构隧道IDK13+188里程处断面为例,将地面沉降作为实测目标,考虑同步注浆压力和衬砌管片外围注浆体硬化过程对地面沉降的影响,结合均匀试验和非参数回归建立土层参数与地面沉降之间的响应面,在此基础上,对每个工况在一定范围中枚举出的大量土层参数样本进行计算,得到地面沉降的计算值,考虑到地面沉降实测值量测的误差,结合可变容差法,按照工况逐次对地面沉降计算值进行筛分,从而得到符合条件的地面沉降计算值对应的土层参数取值区间.最后,利用反分析得到的土层参数分析预测了该断面临近开挖断面的地面沉降.
The soil parameters selected in the process of geotechnical engineering are generally obtained through indoor tests, and the test results tend to be discrete due to the reasons of test conditions and test methods, which are different from the real values.Taking Kunming Metro Line 2 Taking the section of IDK13 +188 up and down in the interval as an example, taking the ground subsidence as the measured target, considering the influence of synchronous grouting pressure and grouting hardening process on the land subsidence, Parameter regression to establish the response surface between soil parameters and land subsidence. On this basis, a large number of soil parameters enumerated in a certain range for each working condition are calculated to obtain the calculated values of ground subsidence, taking into account Ground subsidence measured value of the error, combined with variable tolerance method, in accordance with the conditions of successive ground subsidence calculation of the value of screening, resulting in the calculation of land subsidence value corresponding to the soil parameter value range.Finally, using Analysis of soil parameters obtained by back analysis predicts the land subsidence near the excavation section of this section.