A portable bender element-double cone penetration (BE-DCP) testing equipment, which is invented as a prototype model for measuring the small-strain stiffness (shear wave velocity, V_s) and shear strength of in-situ soft soil deposits (loose sand and soft clay) is developed in this study. The shear wave velocity in two orthogonal directions (V_s-hv and V_s-hh) of the in-situ soils is measured from paired bender elements (BE) installed on the side of the cone shaft. The bender elements are housed in a mechanically controlled sliding block in the shaft which not only protects bender elements while the BE-DCP apparatus is being pushed into the ground, but also ensures a good contact between adjacent soil particles and benders when the target depth is reached. The real-time relationship of the pushing force and penetration depth is recorded by force transducer and laser displacement sensor and graphed in LabVIEW. Based on the cone penetration testing (CPT) theory, two formulas are derived to calculate the shear strength parameters of the in-situ soils. Test results obtained from both the portable bender element-double cone penetration (BE-DCP) testing apparatus and conventional laboratory experiments on Ottawa sand 20/30, four different sizes of Dolomite sands in various packing densities and Kaolinite under different water contents and densities as well as a field testing were compared and validated, indicating that the novel designed portable bender elementdouble cone penetration (BE-DCP) apparatus is robust, fast, and cost-efficient for measurement of small-strain stiffness and shear strength of in-situ soils.

便携式弯管机-双锥入度（BE-DCP）测试设备被发明为原型模型，用于测量原位软土沉积物（松散）的小应变刚度（剪切波速，V _s）和剪切强度砂和软粘土）是在这项研究中开发的。在两个正交方向（V _s-hv和V _s-hh）的原位土壤是从安装在圆锥轴侧面的成对弯曲器元件（BE）进行测量的。弯曲机元件被容纳在轴中的机械控制滑块中，该滑块不仅可以在将BE-DCP设备推入地下时保护弯曲机元件，而且还可以确保目标深度达到目标深度时相邻土壤颗粒与弯曲机之间的良好接触。到达。推力和穿透深度的实时关系由力传感器和激光位移传感器记录，并在LabVIEW中绘制。基于圆锥渗透试验（CPT）理论，推导了两个公式来计算原位土的抗剪强度参数。