Shaoxing University

Hangzhou City University

Yunjin Hu

Zhen Zhong

Bo Li

Zhihai He

Man Huang

Zhenbo Wu

Lu Shi

Jintao Lai

Yuanjun Lv

Chengrong Ma

Huan Yang

Huicai Gao

Feng Chen

Lianying Zhou

Shigui Du

Zhanyou Luo

Rui Yong

Jiqing Jiang

A device and method for mud solidification based on electro-osmosis well points cooperating with well-points dewatering. The method includes the following steps: 1) preparation; 2) construction of well point pipe positioning frame beams; 3) assembly of a mobile trestle platform; 4) well point pipe arrangement; 5) well point/electro-osmosis dewatering; 6) filtrate treatment; 7) well point pipe dismantling; and 8) excavation and transportation of solidified drilling slag for utilization. According to the disclosure, well point pipes are adopted and used as an anode and a cathode of an electro-osmosis well, and on-site quick solidification of pile foundation mud is implemented through the electro-osmosis combined with light well-points dewatering; by the adoption of the well point pipe positioning frame beams, the problems that drilling slag in a sedimentation tank has a large water content and it is difficult to arrange and fix the well point pipes are well solved.

Device and method for mud solidification based on electro-osmosis well points cooperating with well-points dewatering

Disclosed is a three-parameter strength reduction method for slope stability evaluation. The present disclosure reflects the difference in the attenuation and contribution of the cohesion, internal friction angle and tensile strength in the process of slope instability by reducing the three parameters by different reduction factors. Based on the sudden change of the characteristic point displacement of the slope as a criterion of slope instability, the present disclosure derives the fitting relationship between the characteristic point displacement and the cohesion reduction factor. The present disclosure assumes that the comprehensive safety factor satisfies a linear relationship with the cohesion reduction factor, the internal friction angle reduction factor and the tensile strength reduction factor and derives the relationship between the comprehensive safety factor and the cohesion reduction factor. Finally, the present disclosure summarizes and proposes a three-parameter strength reduction method and provides the steps for analyzing the slope stability through this method.

Three-parameter strength reduction method for slope stability evaluation

A tester assembled by multiple sets of mechanisms for shear strength-scale effect of a rock joint includes a horizontal loading mechanism, a horizontal supporting and force-measuring mechanism and a sample installation and lifting table are mounted on a platform on the bottom of a frame, the horizontal loading mechanism and the horizontal supporting and force-measuring mechanism are respectively located on two sides of the sample installation and lifting table; rock joint sample is divided into an upper portion and a lower portion by a slit, the horizontal loading mechanism is configured to load the upper portion of the multi-scale rock joint sample, and the horizontal supporting and force-measuring mechanism is configured to support the lower portion of the multi-scale rock joint sample; a vertical loading mechanism is located above the multi-scale rock joint sample, and can be mounted on the frame in a manner of being movable up and down; and the horizontal loading mechanism comprises at least two tangential actuators, and the vertical loading mechanism comprises a vertical actuator group including at least two vertical actuators. The present invention effectively meets the test requirements on the scale of the multi-scale rock joint samples under large-range loads, and is good in reliability.

Tester assembled by multiple sets of mechanisms for shear strength-scale effect of rock joint

Growing community of inventors

Shaoxing, China

Yunjin Hu