Internal and external bidirectional sliding type lateral pressure test device

The utility model provides an internal and external bidirectional sliding type lateral pressure testing device, and belongs to the technical field of geotechnical material testing instruments. The device comprises a mandrel, a first center cylinder, a second center cylinder, an inner cavity elastic film, an outer cavity elastic film, an inner cavity bidirectional sliding type fixing piece, an outer cavity bidirectional sliding type fixing piece, an inner cavity pressure sensor, an outer cavity pressure sensor, a displacement sensor and a pressure supply mechanism. A complete lateral pressure test curve can be obtained in a field test, accurate measurement of probe pressure and expansion deformation can be realized, and the success rate and the accuracy of the field lateral pressure test are effectively improved. 本实用新型提供一种内外双向滑动式旁压试验装置，属于岩土材料测试仪器技术领域。该装置包括芯轴、第一中心筒、第二中心筒、内腔弹性膜、外腔弹性膜、内腔双向滑动式固定件、外腔双向滑动式固定件、内腔压力传感器、外腔压力传感器、位移传感器，以及，压力供给机构。其在现场试验中可以得到完整的旁压试验曲线，能够实现对探头压力和膨胀变形的准确测量，有效提高了现场旁压试验的成功率和准确性。