为解决盾构出渣体积计算模型精度低及稳定性差的问题，设计出一种新型体积计算模型——异形三棱柱模型。该模型基于不规则三角网络建立渣土表面轮廓包络线，沿着渣土轮廓包络线对渣土进行分割，形成n个不规则的异形三棱柱； 通过求解每个异形三棱柱体积，积分得到渣土体积。同时，结合相邻两帧数据，拟合填补相邻数据间缺失的渣土信息，更加贴近真实的渣土轮廓，避免传统方法——断面积分模型“一刀切”的弊病。最后，搭建渣土体积测量试验台，选取砂石、砂土、石子作为试验渣样，测试断面面积为分模型和异形三棱柱模型的测量精度。试验结果表明： 1）相比于断面积分模型，异型三棱柱模型数据稳定性提高13%，精度提高25%； 2）针对石子、砂石、砂土3种渣样，异型三棱柱模型的测量精度分别为±5.4%、±3.8%、±1.8%。
The existing models for calculating shield muck volume
exhibit a low accuracy. To address this issue, an novel shield muck volume
calculation model—the irregular triangular prism model—s proposed. The model creates the enveloping lines of muck surface
contour and cut the muck into n irregular triangular prisms along the
enveloping lines. By calculating volume of each prism, the volume of muck can
be obtained. The model fuses two adjacent frames of data to fill the missing
muck information between the two frames of data, thus restoring the real
contour of the muck more accurately. Finally, a muck volume measuring platform
is constructed, and the sandstone, sandy soil, and stone are used as
experimental samples to test the measuring accuracy of two models. The results
show that: (1) Compare to cross-sectional integration
model, the irregular triangular prism model exhibits 13% and 25% increase in
data stability and accuracy, respectively. (2) The measuring accuracy of stone,
sandstone, and sandy soil by irregular triangular prism model is improved by ±5.4%, ±3.8%, and ±1.8%,
respectively.
