DEVICE FOR PROVIDING SHEARING WAVE FOR GROUND AND MEASURING METHOD OF LIQUEFACTION STRENGTH

PURPOSE:To measure comparatively easily and accurately liquefaction strength of the ground by transferring shearing waves generated by the reciprocation of a weight to the ground, and measuring interstitial water pressure varied by the shearing waves. CONSTITUTION:A weight 14 housed in a container 11 is reciprocated by an electromagnet 17, and a shearing wave generating section 2 to generate shearing waves by making the collision of the weight 14 with stoppers 12 and 13 is provided. After that, anchoring means 3 and 3 consisting of a pair of opposed bearing plates 30, 31 and strut means 32, 32 bridged between the bearing plates and capable of varying the interval are provide. Then, the shearing wave generating section 2 is fixed to the inside of a hole bored in the ground with the anchoring means 3. Shearing waves generated by the shearing wave generating section 2 are transferred to the ground through the anchoring means 3. Interstitial water pressure varied by the shearing waves propagated in the ground is measured by an interstitial water gauge installed at a certain distance from a shearing wave generator 1 to measure liquefaction strength of the ground.