新型静止侧压力系数试验仪的研制与应用

研制了一种新型静止侧压力系数试验仪，介绍了该仪器结构及工作原理。对干砂进行了试验，测定其静止侧压力系数，与传统的水囊式 固结仪试验结果进行了对比。分析了该试验仪的可能误差来源，主要包括加载过程中的试样侧向变形和试样与压力室筒壁之间的摩擦力，具体分析了试样侧向变形引起 值误差的大小，提出了摩擦力影响修正方法，充分论证了仪器的准确性和有效性。对某粗颗粒土进行了静止侧压力系数试验，测定了该土在加载及卸载条件下 随应力状态的变化，验证了仪器对粗颗粒土的适用性。该仪器结构简单，操作方便，结果准确，适用于包括粗颗粒土在内的各种土的 试验，克服了现有的静止侧压力系数试验仪不适用于粗颗粒土的缺陷，而且适用高应力范围。

Development and application of new apparatus for K0 test

In this paper, the large apparatus to measure static lateral pressure coefficient was introduced. The value of dry sand was tested by using the apparatus. The dry-sand test result was used to compare with the test of the water-bag type oedometer. The friction of the sidewall produced during the experiment was amended, and the deviation caused by lateral expansion were also analyzed. The accuracy and effectiveness of the apparatus was validated. Coarse granular soil was tested by this apparatus. And the change of under various stress conditions was tested, which verified the applicability of the apparatus to coarse granular soil. It is convenient in operation, stable in performance, and precise in accuracy. It can be used to test the static lateral pressure coefficient of large practical size coarse grained soil, which is hard to get with the traditional instrument.