盐渍土现场溶陷的双线法试验

发布时间：2018-11-05 16:57

【摘要】：针对盐渍土现场溶陷特性,在察尔汗盐湖地区进行了盐渍土的现场溶陷试验研究,补充了现场双线法试验,验证了该方法在研究盐渍土现场溶陷中的适用性,得出了试验数据,并从中掌握了现场盐渍土地基浸水溶陷的规律,提供了技术依据。试验表明:双线法适用于盐渍土现场溶陷的试验研究;在盐渍土浸水加载的过程中,存在溶陷起始压力和真溶陷起始压力,前者(75 k Pa)是浸水盐渍土地基产生溶陷的起始点,而后者(110~115 k Pa)是天然地基和浸水地基沉降量大小交替的临界点,地基的沉降也被这两个值分成了3个阶段;加载至峰值溶陷压力(175 k Pa)时,溶陷系数也达到最大,即峰值溶陷系数(0.194),当加载超过峰值溶陷压力后,溶陷变缓,溶陷系数变小。
[Abstract]:In view of the field dissolution characteristics of saline soil, the field dissolution test of saline soil in Chaerhan Salt Lake area was carried out, which was supplemented by the field double-line test. The applicability of this method in the study of field dissolution and subsidence of saline soil was verified, and the test data were obtained. From it, the law of soaking and settling of salinized soil foundation is grasped, and the technical basis is provided. The results show that the double-line method is suitable for the in-situ solution of salinized soil. In the process of soaking and loading of saline soil, there exists the initial pressure of solution subsidence and that of true solution. The former (75 k Pa) is the starting point of solution settlement in saline soil foundation. The latter (110 ~ 115 k Pa) is the critical point of alternating settlement between the natural foundation and the submerged foundation, and the settlement of the foundation is divided into three stages by these two values. When loading to the peak dissolved pressure (175 k Pa), the dissolution coefficient also reached the maximum, that is, the peak value of solubilization coefficient (0.194). When the loading exceeded the peak dissolved pressure, the solution trapping became slower and the dissolution coefficient became smaller.
【作者单位】：陕西省土地工程建设集团;中交第一公路勘察设计研究院有限公司;中铁隧道勘测设计院有限公司;
【基金】：青海省交通建设科技项目(KYHTF 2011-05)
【分类号】：TU448

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